1. Overview
Apache Karaf is a OSGi-based runtime which provides a lightweight container onto which various components and applications can be deployed.
Apache Karaf uses either Apache Felix Framework or Eclipse Equinox OSGi frameworks, and provide additional features on top of the framework.
Apache Karaf can be scaled from a very lightweight container to a fully features enterprise service: it’s a very flexible and extensible container, covering all the major needs.
Here is a short list of provided features:
-
Hot deployment: simply drop a file in the
deploy
directory, Apache Karaf will detect the type of the file and try to deploy it. -
Complete Console: Apache Karaf provides a complete Unix-like console where you can completely manage the container.
-
Dynamic Configuration: Apache Karaf provides a set of command dedicated for the management of the configuration files. All configuration files are centralized in the
etc
folder. Any change in a configuration file is taken on the fly. -
Advanced Logging System: Apache Karaf supports a large set of Logging framework (slf4j, log4j, etc). Whatever the logging framework you use, Apache Karaf centralizes the configuration in one file.
-
Provisioning: Apache Karaf supports a large set of URL where you can install your application (Maven repository, HTTP, file, etc). It also provides the concept of "Karaf Feature" which is a way to describe your application.
-
Management: Apache Karaf is an enterprise-ready container, providing a lot of management indicators and operations via JMX.
-
Remote: Apache Karaf embeds an SSHd server allowing you to use the console remotely. The management layer is also accessible remotely.
-
Security: Apache Karaf provides a complete security framework (based on JAAS), and providing RBAC (Role-Based Access Control) mechanism for console and JMX.
-
Instances: multiple instances of Apache Karaf can be managed directly from a main instance (root).
-
OSGi frameworks: Apache Karaf is not tight to one OSGi framework. By default, Apache Karaf runs with Apache Felix Framework, but you can easily switch to Equinox (just change on property in a configuration file).
2. Update Notes (from 2.x to 3.x)
This section is dedicated to users of previous Apache Karaf version.
2.1. Distributions
The Apache Karaf distributions content has changed.
On Apache Karaf 2.x, we provide:
-
tar.gz archive dedicated for Unix platforms
-
zip archive dedicated for Windows platforms
Now, Apache Karaf 3.x still provide tar.gz and zip archives, but the content is the same.
Especially, the two archives contains a bin
folder with both Unix scripts and Windows bat scripts.
2.2. Commands
Most of the console commands have been renamed and dispatched in scopes between Apache Karaf 2.x and Apache Karaf 3.x.
The purpose is to standardize the naming convention, and use more "logic" scope (especially for subshell).
The following table shows the difference between the "old" commands and the "new" ones (if changed).
Apache Karaf 2.x | Apache Karaf 3.x |
---|---|
admin:change-opts |
instance:opts-change |
admin:change-rmi-registry-port |
instance:rmi-registry-port-change |
admin:change-rmi-server-port |
instance:rmi-server-port-change |
admin:change-ssh-port |
instance:ssh-port-change |
admin:clone |
instance:clone |
admin:connect |
instance:connect |
admin:create |
instance:create |
admin:destroy |
instance:destroy |
admin:list |
instance:list |
admin:rename |
instance:rename |
admin:start |
instance:start |
admin:status |
instance:status |
admin:stop |
instance:stop |
dev:create-dump |
dev:dump-create |
features:add-url |
feature:repo-add |
features:chooseurl |
feature:repo-add |
features:info |
feature:info |
features:install |
feature:install |
features:listVersions |
feature:version-list |
features:list |
feature:list |
features:listRepositories |
feature:repo-list |
features:listUrl |
feature:repo-list |
features:refreshUrl |
feature:repo-refresh |
features:removeRepository |
feature:repo-remove |
features:removeUrl |
feature:repo-remove |
features:uninstall |
feature:uninstall |
jaas:pending |
jaas:pending-list |
jaas:realms |
jaas:realm-list |
jaas:users |
jaas:user-list |
jaas:manage |
jaas:realm-manage |
jaas:roleadd |
jaas:role-add |
jaas:roledel |
jaas:role-delete |
jaas:useradd |
jaas:user-add |
jaas:userdel |
jaas:user-delete |
config:propappend |
config:property-append |
config:propdel |
config:property-delete |
config:proplist |
config:property-list |
config:propset |
config:property-set |
dev:dynamic-import |
bundle:dynamic-import |
dev:framework |
system:framework |
dev:print-stack-traces |
shell:stack-traces-print |
dev:restart |
system:shutdown |
dev:show-tree |
bundle:tree-show |
dev:system-property |
system:property |
dev:wait-for-service |
service:wait |
dev:watch |
bundle:watch |
log:display-exception |
log:exception-display |
obr:addUrl |
obr:url-add |
obr:listUrl |
obr:url-list |
obr:refreshUrl |
obr:url-refresh |
obr:removeUrl |
obr:url-remove |
osgi:bundle-level |
bundle:start-level |
osgi:classes |
bundle:classes |
osgi:find-class |
bundle:find-class |
osgi:headers |
bundle:headers |
osgi:info |
bundle:info |
osgi:install |
bundle:install |
osgi:bundle-services |
bundle:services |
osgi:list |
bundle:list |
osgi:ls |
service:list |
osgi:name |
system:name |
osgi:refresh |
bundle:refresh |
osgi:resolve |
bundle:resolve |
osgi:restart |
bundle:restart |
osgi:shutdown |
system:shutdown |
osgi:start |
bundle:start |
osgi:start-level |
bundle:start-level |
osgi:stop |
bundle:stop |
osgi:uninstall |
bundle:uninstall |
osgi:update |
bundle:update |
osgi:version |
system:version |
packages:exports |
package:exports |
packages:imports |
package:imports |
We encourage the users to use the --help
option to check the name and type of arguments and options.
In term of development, the previously shell anotations provided by the org.apache.felix.gogo.commands*
package (@Command
, @Argument
, etc)
are now deprecated. Apache Karaf 3.0.0 still supports these annotations, but we encourage the users to upgrade to the new package org.apache.karaf.shell.commands
.
Shell annotation | Apache Karaf 2.x | Apache Karaf 3.x |
---|---|---|
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Class name | Apache Karaf 2.x | Apache Karaf 3.x |
---|---|---|
Action |
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CommandException |
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AbstractCommand |
|
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2.3. JMX MBeans
Like the console commands, the JMX MBeans object names have been renamed and the operations haven been dispatched in new MBeans.
The following table shows the correspondence between the "old" MBeans object names and the "new" ones.
Apache Karaf 2.x | Apache Karaf 3.x |
---|---|
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2.4. Features
The Apache Karaf "core" features repository XML URL have changed:
Apache Karaf 2.x | Apache Karaf 3.x |
---|---|
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|
The Spring features have been isolated in a dedicated features repository (mvn:org.apache.karaf.features/spring/3.0.x/xml/features
).
2.5. Namespaces
Apache Karaf 3.x brings updated version of the namespaces:
-
Supported features namespaces:
-
karaf-features-1.0.0.xsd
-
karaf-features-1.1.0.xsd
-
karaf-features-1.2.0.xsd
-
-
Supported jaas namespaces:
-
karaf-jaas-1.0.0.xsd
-
karaf-jaas-1.1.0.xsd
-
-
Supported shell namespaces:
-
karaf-shell-1.0.0.xsd
-
karaf-shell-1.1.0.xsd
-
2.6. Maven plugin
The previous features-maven-plugin
and cmdhelp-maven-plugin
Maven plugins have been gathered in one main Maven
plugin: karaf-maven-plugin
.
The goals have changed as follow:
Apache Karaf 2.x Maven plugins | Apache Karaf Maven plugin (3.x) |
---|---|
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Using the features:add-features-to-repo
goal, you have now to explicitily define the Apache Karaf features URL (previously, the Apache Karaf features were automatically added).
It means that you have to define:
<descriptor>mvn:org.apache.karaf.features/standard/3.0.0/xml/features</descriptor> <descriptor>mvn:org.apache.karaf.features/spring/3.0.0/xml/features</descriptor> <descriptor>mvn:org.apache.karaf.features/enterprise/3.0.0/xml/features</descriptor>
2.7. Test tooling
Apache Karaf 3.0.x is fully supported by OPS4J Pax Exam and "previous" karaf-pax-exam module is no more maintained.
2.8. WebContainer
WebApplications using the WebApp-Context
headers in the MANIFEST are no more supported.
Apache Karaf now supports only the OSGi standard Web-ContextPath
header in the MANIFEST.
2.9. Update guide
We encourage users to stard a fresh Apache Karaf 3.x container more than trying to override the folders from an Apache Karaf 2.x container.
Most of the files in the different Apache Karaf folders have changed, and the merge/diff is very large.
The future Apache Karaf version will introduce the concept of "Karaf Profiles" to simplify the update process.
3. Quick Start
This instructions should help you get Apache Karaf up and running in 5 to 15 minutes.
3.1. Prerequisites
Karaf requires a Java SE 7 environment to run. Refer to http://www.oracle.com/technetwork/java/javase/ for details on how to download and install Java SE 1.7 or greater.
-
Open a Web browser and access the following URL: http://karaf.apache.org/index/community/download.html
-
Download the binary distribution that matches your system (zip for windows, tar.gz for unixes)
-
Extract the archive a new folder on your hard drive; for example in c:\karaf - from now on this directory will be referenced as <KARAF_HOME>.
3.2. Start the server
Open a command line console and change the directory to <KARAF_HOME>.
To start the server, run the following command in Windows:
bin\karaf.bat
respectively on Unix:
bin/karaf
You should see the following information on the command line console:
__ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf. karaf@root()>
3.3. Some shell Basics
You can now run your first command. Simply type the <tab>
key in the console.
karaf@root> Display all 183 possibilities? (y or n) *:config *:dev *:feature *:instance *:jaas *:kar *:log *:package *:region *:service *:shell *:ssh addbundle addfilter addregion alias cancel cl clear clone config config:cancel config:delete config:edit config:list config:property-append config:property-delete config:property-list config:property-set config:update connect create date delete destroy dev dev:dump-create display dump-create each ...
You can then grab more specific help for a given command using the --help
option for this command:
karaf@root()> bundle:list --help DESCRIPTION bundle:list Lists all installed bundles. SYNTAX bundle:list [options] OPTIONS -u Shows the update locations --help Display this help message --table Show bundles using a shell table -t Specifies the bundle threshold; bundles with a start-level less than this value will not get printed out. -l Show the locations -s Shows the symbolic name
Note that the console supports tab completion so if your start typing a command it will show possible completions and also auto complete if there is only one completion.
3.4. Deploy a sample application
While you will learn in the Karaf user’s guide how to fully use and leverage Apache Karaf, let’s install a sample Apache Camel application for now:
In the console, run the following commands:
karaf@root()> feature:repo-add camel 2.10.0 Adding feature url mvn:org.apache.camel.karaf/apache-camel/2.10.0/xml/features karaf@root()> feature:install camel-spring karaf@root()> bundle:install -s mvn:org.apache.camel/camel-example-osgi/2.10.1
The example installed is using Camel to start a timer every 2 seconds and output a message on the console. The previous commands download the Camel features descriptor and install the example feature.
>>>> SpringDSL set body: Fri Jan 07 11:59:51 CET 2011 >>>> SpringDSL set body: Fri Jan 07 11:59:53 CET 2011 >>>> SpringDSL set body: Fri Jan 07 11:59:55 CET 2011
3.4.1. Stopping and uninstalling the sample application
To stop this demo, run the following command:
karaf@root()> bundle:stop org.apache.camel.camel-example-osgi
3.5. Stopping Karaf
To stop Karaf from the console, enter ^D
in the console:
^D
Alternatively, you can also run the following command:
system:shutdown
3.5.1. Cleaning the Karaf state
Normally Karaf remembers the features and bundles you installed and started. The reset Karaf into a clean state just delete the data directory when karaf is not running.
3.6. Summary
This document showed how simple it is to have Apache Karaf up and running and install a simple Apache Camel application.
4. User Guide
4.1. Installation
Apache Karaf is a lightweight container, very easy to install and administrate, on both Unix and Windows platforms.
4.1.1. Requirements
Hardware:
-
50 MB of free disk space for the Apache Karaf binary distribution.
Operating Systems:
-
Windows: Windows 8, Windows 7, Windows 2003, Windows Vista, Windows XP SP2, Windows 2000.
-
Unix: RedHat Enterprise Linux, Debian, SuSE/OpenSuSE, CentOS, Fedora, Ubuntu, MacOS, AIX, HP-UX, Solaris, any Unix platform that supports Java.
Environment:
-
Java SE 1.7.x or greater (http://www.oracle.com/technetwork/java/javase/).
-
The JAVA_HOME environment variable must be set to the directory where the Java runtime is installed,
4.1.2. Using Apache Karaf binary distributions
Apache Karaf is available in two distributions, both as a tar.gz and zip archives.
The "default" distribution is a "ready to use" distribution. The "default" distribution provides the following features enabled.
The "minimal" distribution is like the minimal distributions that you can find for most of Unix distributions. Only the core layer is packaged, most of the features and bundles are downloaded from Internet at bootstrap. It means that Apache Karaf minimal distribution requires an Internet connection to start correctly. The features provided by the "minimal" distribution are exactly the same as in the "default" distribution, the difference is that the minimal distribution will download the features from Internet.
Installation on Windows platform
Note
|
The |
-
From a browser, navigate to http://karaf.apache.org/index/community/download.html
-
Download Apache Karaf binary distribution in the zip format:
apache-karaf-3.0.0.zip
. -
Extract the files from the zip file into a directory of your choice (it’s the
KARAF_HOME
)
Note
|
Remember the restrictions concerning illegal characters in Java paths, e.g. \!, % etc. |
Note
|
In case you have to install Karaf into a very deep path or a path containing illegal characters for Java paths, e.g. \!, % etc., you may add a bat file to start -> startup that executes subst S: "C:\your very % problematic path!\KARAF" so your Karaf root directory is S: --- which works for sure and is short to type. |
Installation on Unix platforms
Note
|
The |
echo $JAVA_HOME
If it’s not correct, fix it using:
export JAVA_HOME=....
-
From a browser, navigate to http://karaf.apache.org/index/community/download.html
-
Download Apache Karaf binary distribution in the tar.gz format:
apache-karaf-3.0.0.tar.gz
. -
Extract the files from the tar.gz file into a directory of your choice (it’s the
KARAF_HOME
). For example:
gunzip apache-karaf-3.0.0.tar.gz tar xvf apache-karaf-3.0.0.tar
Note
|
Remember the restrictions concerning illegal characters in Java paths, e.g. \!, % etc. |
4.1.3. Post-Installation steps
Thought it is not always required, it is strongly advised to set up the JAVA_HOME
environment property to point to the JDK you want Apache Karaf to use before starting it.
This property is used to locate the java
executable and should be configured to point to the home directory of the Java SE 7 installation.
By default, all Apache Karaf files are "gather" in one directory: the KARAF_HOME
.
You can define your own directory layout, by using some Karaf environment variables:
-
KARAF_DATA
is the location of the data folder, where Karaf stores temporary files. -
KARAF_ETC
is the location of the etc folder, where Karaf stores configuration files. -
KARAF_BASE
is the Karaf base folder. By defaultKARAF_BASE
is the same asKARAF_HOME
.
4.1.4. Building from Sources
If you intend to build Apache Karaf from the sources, the requirements are a bit different:
Hardware:
-
500 MB of free disk space for the Apache Karaf source distributions or SVN checkout, the Maven build and the dependencies Maven downloads.
Environment:
-
Java SE Development Kit 1.7.x or greater (http://www.oracle.com/technetwork/java/javase/).
-
Apache Maven 3.0.4 (http://maven.apache.org/download.html).
Building on Windows platform
-
You can get the Apache Karaf sources from:
-
the sources distribution
apache-karaf-3.0.0-src.zip
available at http://karaf.apache.org/index/community/download.html. Extract the files in the directory of your choice. -
by checkout of the git repository:
-
git clone https://git-wip-us.apache.org/repos/asf/karaf.git karaf
-
Use Apache Maven to build Apache Karaf:
mvn clean install
Note
|
You can speed up the build by bypassing the unit tests: mvn clean install -DskipTests |
-
You can find the built binary distribution in
assemblies\apache-karaf\target\apache-karaf-3.0.0.zip
. You can install and use it as explained in the "Using Apache Karaf binary distributions" section.
Building on Unix platforms
-
You can get the Apache Karaf sources from:
-
the sources distribution
apache-karaf-3.0.0-src.tar.gz
available at http://karaf.apache.org/index/community/download.html. Extract the files in the directory of your choice. -
by checkout of the git repository:
-
git clone https://git-wip-us.apache.org/repos/asf/karaf.git karaf
-
Use Apache Maven to build Apache Karaf:
mvn clean install
Note
|
You can speed up the build by bypassing the unit tests: mvn clean install -DskipTests |
-
You can find the built binary distribution in
assemblies/apache-karaf/target/apache-karaf-3.0.0.tar.gz
. You can install and use it as explained in the "Using Apache Karaf binary distributions" section.
4.2. Directory structure
The directory layout of a Karaf installation is as follows:
-
/bin
: control scripts to start, stop, login, … -
/etc
: configuration files -
/data
: working directory-
/cache
: OSGi framework bundle cache -
/generated-bundles
: temporary folder used by the deployers -
/log
: log files
-
-
/deploy
: hot deploy directory -
/instances
: directory containing [instances|instances] -
/lib
: contains the bootstrap libraries-
/lib/ext
: directory for JRE extensions -
/lib/endorsed
: directory for endorsed libraries
-
-
/system
: OSGi bundles repository, laid out as a Maven 2 repository
The `data` folder contains all the working and temporary files for Karaf. If you want to restart from a clean state, you can wipe out this directory, which has the same effect as link:start-stop[using the clean option].
4.3. Start, stop, restart, connect
4.3.1. Start
Apache Karaf supports different start mode:
-
the "regular" mode starts Apache Karaf in foreground, including the shell console.
-
the "server" mode starts Apache Karaf in foreground, without the shell console.
-
the "background" mode starts Apache Karaf in background.
You can also manage Apache Karaf as a system service (see System Service section of this manual).
Regular mode
The regular mode uses the bin/karaf
Unix script (bin\karaf.bat
on Windows). It’s the default start process.
It starts Apache Karaf as a foreground process, and displays the shell console.
On Unix:
bin/karaf __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf. karaf@root()>
On Windows:
bin\karaf.bat __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf. karaf@root()>
Note
|
Closing the console or shell window will cause Apache Karaf to terminate. |
Server mode
The server mode starts Apache Karaf as a foreground process, but it doesn’t start the shell console.
To use this mode, you use the server
argument to the bin/karaf
Unix script (bin\karaf.bat
on Windows).
On Unix:
bin/karaf server
On Windows:
bin\karaf.bat server
Note
|
Closing the console or shell window will cause Apache Karaf to terminate. |
You can connect to the shell console using SSH or client (see the Connect section in this page).
Background mode
The background mode starts Apache Karaf as a background process.
To start in background mode, you have to use bin/start
Unix script (bin\start.bat
on Windows).
On Unix:
bin/start
On Windows:
bin\start.bat
You can connect to the shell console using SSH or client (see the Connect section in this page).
Clean start
Apache Karaf stores all previously applications installed and changes that you did in the data folder.
If you want to start from a clean state, you can remove the data folder.
For convenience, you can use the clean
argument to the bin/karaf
Unix script (bin\karaf.bat
on Windows).
On Unix:
bin/karaf clean
bin/start clean
On Windows:
bin\karaf.bat clean
bin\start.bat clean
Customize variables
Apache Karaf accepts environment variables:
-
JAVA_MIN_MEM
: minimum memory for the JVM (default is 128M). -
JAVA_MAX_MEM
: maximum memory for the JVM (default is 512M). -
JAVA_PERM_MEM
: minimum perm memory for the JVM (default is JVM default value). -
JAVA_MAX_PERM_MEM
: maximum perm memory for the JVM (default is JVM default value). -
KARAF_HOME
: the location of your Apache Karaf installation (default is found depending where you launch the startup script). -
KARAF_BASE
: the location of your Apache Karaf base (default isKARAF_HOME
). -
KARAF_DATA
: the location of your Apache Karaf data folder (default isKARAF_BASE/data
). -
KARAF_ETC
: the location of your Apache Karaf etc folder (default isKARAF_BASE/etc
). -
KARAF_OPTS
: extra arguments passed to the Java command line (default is null). -
KARAF_DEBUG
: if true, enable the debug mode (default is null). If debug mode is enabled, Karaf starts a JDWP socket on port 5005. You can plug your IDE to define breakpoints, and run step by step.
You can define these environment variables in bin/setenv
Unix script (bin\setenv.bat
on Windows).
For instance, to set the minimum and maximum memory size for the JVM, you can define the following values:
On Unix:
# Content of bin/setenv export JAVA_MIN_MEM=256M exoprt JAVA_MAX_MEM=1024M
On Windows:
rem Content of bin\setenv.bat set JAVA_MIN_MEM=256M set JAVA_MAX_MEM=1024M
Connect
Even if you start Apache Karaf without the console (using server or background modes), you can connect to the console. This connection can be local or remote. It means that you can access to Karaf console remotely.
To connect to the console, you can use the bin/client
Unix script (bin\client.bat
on Windows).
On Unix:
bin/client Logging in as karaf 360 [pool-2-thread-3] WARN org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at /0.0.0.0:8101 presented unverified key: __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
On Windows:
bin\client.bat Logging in as karaf 360 [pool-2-thread-3] WARN org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at /0.0.0.0:8101 presented unverified key: __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0-SNAPSHOT) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
By default, client
tries to connect on localhost, on port 8101 (the default Apache Karaf SSH port).
client
accepts different options to let you connect on a remote Apache Karaf instance. You can use --help
to get details about the options:
On Unix:
bin/client --help Apache Karaf client -a [port] specify the port to connect to -h [host] specify the host to connect to -u [user] specify the user name --help shows this help message -v raise verbosity -r [attempts] retry connection establishment (up to attempts times) -d [delay] intra-retry delay (defaults to 2 seconds) -b batch mode, specify multiple commands via standard input -f [file] read commands from the specified file [commands] commands to run If no commands are specified, the client will be put in an interactive mode
On Windows:
bin\client.bat --help Apache Karaf client -a [port] specify the port to connect to -h [host] specify the host to connect to -u [user] specify the user name --help shows this help message -v raise verbosity -r [attempts] retry connection establishment (up to attempts times) -d [delay] intra-retry delay (defaults to 2 seconds) -b batch mode, specify multiple commands via standard input -f [file] read commands from the specified file [commands] commands to run If no commands are specified, the client will be put in an interactive mode
Actually, client
is a SSH client. You can use any SSH client to connect, like OpenSSH (ssh command) on Unix, or Putty on Windows.
For instance, on Unix, you can do:
ssh karaf@localhost -p 8101 Authenticated with partial success. Authenticated with partial success. Authenticated with partial success. Password authentication Password: __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0-SNAPSHOT) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
4.3.2. Stop
When you start Apache Karaf in regular mode, the logout
command or CTRL-D key binding logout from the console and shutdown Apache Karaf.
When you start Apache Karaf in background mode (with the bin/start
Unix script (bin\start.bat
on Windows)), you can use the bin/stop
Unix script (bin\stop.bat
on Windows).
More generally, you can use the shutdown
command (on the Apache Karaf console) that work in any case.
The shutdown
command is very similar to the the shutdown
Unix command.
To shutdown Apache Karaf now, you can simple using shutdown
:
karaf@root()> shutdown -h Confirm: halt instance root (yes/no):
The shutdown
command asks for a confirmation. If you want to bypass the confirmation step, you can use the -f
(--force
) option:
karaf@root()> shutdown -f
You can also use directly halt
which is an alias to shutdown -f -h
.
The shutdown
command accepts a time argument. With this argument, you can define when you want to shutdown the Apache Karaf container.
The time argument can have different formats. First, it can be an absolute time in the format hh:mm, in which hh is the hour (1 or 2 digits) and mm is the minute of the hour
(in two digits). Second, it can be in the format m (or +m), in which m is the number of minutes to wait. The word now
is an alias for 0.
For instance, the following command will shutdown Apache Karaf at 10:35am:
karaf@root()> system:shutdown 10:35
Another example to shutdown Apache Karaf in 10 minutes:
karaf@root()> system:shutdown 10
Like for other commands, you can find details on the shutdown
command man page:
karaf@root()> shutdown --help DESCRIPTION system:shutdown Shutdown Karaf. SYNTAX system:shutdown [options] [time] ARGUMENTS time Shutdown after a specified delay. The time argument can have different formats. First, it can be an abolute time in the format hh:mm, in which hh is the hour (1 or 2 digits) and mm is the minute of the hour (in two digits). Second, it can be in the format +m, in which m is the number of minutes to wait. The word now is an alias for +0. OPTIONS -c, --clean, --clean-all, -ca Force a clean restart by deleting the data directory -f, --force Force the shutdown without confirmation message. -h, --halt Halt the Karaf container. --help Display this help message -cc, --clean-cache, -cc Force a clean restart by deleting the cache directory -r, --reboot Reboot the Karaf container.
4.3.3. Status
When you start Apache Karaf in background mode, you may want to check the current status.
To do so, you can use the bin/status
Unix script (bin\status.bat
on Windows).
Note
|
The script returns 0 exit code if Apache Karaf is running, 1 exit code else. |
On Unix:
bin/status Not Running ...
bin/status Running ...
On Windows:
bin\status.bat Not Running ...
bin\status.bat Running ...
4.3.4. Restart
The shutdown
command accepts the -r
(--restart
) option to restart Apache Karaf:
karaf@root()> system:shutdown -r
Note
|
This command does not start a new JVM. It simply restarts the OSGi framework. |
4.3.5. SystemMBean
Apache Karaf provides the JMX SystemMBean dedicated to control of the container itself.
The SystemMBean object name is org.apache.karaf:type=system
.
The SystemMBean provides different attributes and operations, especially operations to halt or reboot the container:
-
reboot()
reboots Apache Karaf now (without cleaning the cache) -
reboot(time)
reboots Apache Karaf at a given time (without cleaning the cache). The time format is the same as the time argument of theshutdown
command. -
rebootCleanCache(time)
reboots Apache Karaf at a given time, including the cleanup of the cache. -
rebootCleanAll(time)
reboots Apache Karaf at a given time, including the cleanup of the whole data folder. -
halt()
shutdown Apache Karaf now. -
halt(time)
shutdown Apache Karaf at a given time. The time format is the same as the time argument of theshutdown
command.
4.4. Integration in the operating system: the Service Wrapper
In the previous chapter, we saw the different scripts and commands to start, stop, restart Apache Karaf.
Instead of using these commands and scripts, you can integrate Apache Karaf directly in your operating system service control.
Apache Karaf provides the "Service Wrapper". The service wrapper allows you to directly integrate Apache Karaf:
-
like a native Windows Service
-
like a Unix daemon process
The "Service Wrapper" correctly handles "user’s log outs" under Windows, service dependencies, and the ability to run services which interact with the desktop.
It also includes advanced fault detection software which monitors an application. The "Service Wrapper" is able to detect crashes, freezes, out of memory and other exception events, then automatically react by restarting Apache Karaf with a minimum of delay. It guarantees the maximum possible uptime of Apache Karaf.
4.4.1. Supported platforms
-
Windows 8, 7, 2008 R2, 2003, Vista (32 and 64 bits architecture)
-
Linux RedHat Enterprise Linux, Debian, CentOS, Fedora, Ubuntu (32 and 64 bits architecture)
-
FreeBSD 9.x, 8.x
-
AIX 5.x, 6.x, 7.x (Power architecture)
-
Solaris 8, 9, 10 (x86/Sparc, 32 and 64 bits architecture)
-
HP-UX 10.x, 11.x (32 and 64 bits architecture)
-
SGI Irix
-
MacOS X
4.4.2. Installation
Apache Karaf Service Wrapper is an optional feature. You have to install the "Service Wrapper" installer first.
In the console:
karaf@root()> feature:install service-wrapper
Now, you have the wrapper:install
command, to "register" Apache Karaf as service/daemon on your system:
karaf@root()> wrapper:install --help DESCRIPTION wrapper:install Install the container as a system service in the OS. SYNTAX wrapper:install [options] OPTIONS -d, --display The display name of the service. (defaults to karaf) --help Display this help message -s, --start-type Mode in which the service is installed. AUTO_START or DEMAND_START (Default: AUTO_START) (defaults to AUTO_START) -n, --name The service name that will be used when installing the service. (Default: karaf) (defaults to karaf) -D, --description The description of the service. (defaults to )
4.4.3. Installation
Karaf Wrapper is an optional feature. To install it, simply type:
karaf@root> feature:install wrapper
Once installed, wrapper feature will provide wrapper:install
new command in the Karaf shell:
karaf@root> wrapper:install --help DESCRIPTION wrapper:install Install the container as a system service in the OS. SYNTAX wrapper:install [options] OPTIONS -s, --start-type Mode in which the service is installed. AUTO_START or DEMAND_START (Default: AUTO_START) (defaults to AUTO_START) --help Display this help message -n, --name The service name that will be used when installing the service. (Default: karaf) (defaults to karaf) -d, --display The display name of the service. -D, --description The description of the service. (defaults to )
The wrapper:install
command detects the running Operating Service and provide the service/daemon ready to be integrated in your system.
For instance, on a Ubuntu/Debian Linux system:
karaf@root()> wrapper:install Creating file: /opt/apache-karaf-3.0.5/bin/karaf-wrapper Creating file: /opt/apache-karaf-3.0.5/bin/karaf-service Creating file: /opt/apache-karaf-3.0.5/etc/karaf-wrapper.conf Creating file: /opt/apache-karaf-3.0.5/lib/libwrapper.so Creating file: /opt/apache-karaf-3.0.5/lib/karaf-wrapper.jar Creating file: /opt/apache-karaf-3.0.5/lib/karaf-wrapper-main.jar Setup complete. You may wish to tweak the JVM properties in the wrapper configuration file: /opt/apache-karaf-3.0.5/etc/karaf-wrapper.conf before installing and starting the service. Ubuntu/Debian Linux system detected: To install the service: $ ln -s /opt/apache-karaf-3.0.5/bin/karaf-service /etc/init.d/ To start the service when the machine is rebooted: $ update-rc.d karaf-service defaults To disable starting the service when the machine is rebooted: $ update-rc.d -f karaf-service remove To start the service: $ /etc/init.d/karaf-service start To stop the service: $ /etc/init.d/karaf-service stop To uninstall the service : $ rm /etc/init.d/karaf-service
You can note that wrapper:install
command detected the running operating system ("Ubuntu/Debian Linux system detected").
You have a complete explanation and list of system commands to perform to integrate Apache Karaf in your systemV:
ln -s /opt/apache-karaf-3.0.5/bin/karaf-service /etc/init.d/ update-rc.d karaf-service defaults
Karaf also supports systemd service, so you can use systemctl instead of SystemV based service:
systemctl enable /opt/apache-karaf-3.0.5/bin/karaf.service
This will enable Karaf at system boot.
4.4.4. Uninstall
The wrapper:install
provides the system commands to perform to uninstall the service/daemon).
For instance, on Ubuntu/Debian, to uninstall the Apache Karaf service, you have to remove the karaf-service
script from the runlevel scripts:
rm /etc/init.d/karaf-service
If you prefered the systemd service instead of systemV:
systemctl disable karaf
You can remove the "Wrapper Service" installer after that:
karaf@root()> feature:uninstall service-wrapper
4.4.5. Note for MacOS users
On MacOS you can install the service for an user or for the system.
If you want to add bin/org.apache.karaf.KARAF as user service move this file into ~/Library/LaunchAgents/:
mv bin/org.apache.karaf.KARAF.plist ~/Library/LaunchAgents/
If you want to add org.apache.karaf.KARAF as system service move this into /Library/LaunchDaemons:
sudo mv bin/org.apache.karaf.KARAF.plist /Library/LaunchDaemons/
Change owner and rights:
sudo chown root:wheel /Library/LaunchDaemons/org.apache.karaf.KARAF.plist sudo chmod u=rw,g=r,o=r /Library/LaunchDaemons/org.apache.karaf.KARAF.plist
You can test your service:
launchctl load ~/Library/LaunchAgents/org.apache.karaf.KARAF.plist launchctl start org.apache.karaf.KARAF launchctl stop org.apache.karaf.KARAF
Finally, after restart your session or system you can use launchctl command to start and stop your service.
If you want to remove the service call:
launchctl remove org.apache.karaf.KARAF
4.4.6. Configuration
When using scripts in the Apache Karaf bin
folder, you can using bin/setenv
Unix script (bin\setenv.bat
on Windows) as described in the [Start, stop, restart, connect|start-stop] section of the documentation.
Note
|
The |
To configure Apache Karaf started by the Service Wrapper, you have to tune the etc/karaf-wrapper.conf
file. If you provided the name
option to the wrapper:install
command, the file is etc/karaf-yourname.conf
.
In this file, you can configure the different environment variables used by Apache Karaf. The Service Wrapper installer automatically populate these variables for you during the installation (using wrapper:install
command).
For instance:
-
set.default.JAVA_HOME
is theJAVA_HOME
used to start Apache Karaf (populated during Service Wrapper installation). -
set.default.KARAF_HOME
is the location of your Apache Karaf installation (populated during Service Wrapper installation). -
set.default.KARAF_BASE
is the location of your Apache Karaf installation (populated during Service Wrapper installation). -
set.default.KARAF_DATA
is the location of the Apache Karaf data folder (populated during Service Wrapper installation). -
set.default.KARAF_ETC
is the location of the Apache Karaf etc folder (populated during Service Wrapper installation). -
wrapper.java.additional
is used to pass additional arguments to the Java command, indexed by the argument number. The next index to use is 11. -
wrapper.java.initmemory
is the initial JVM memory size (the-Xms
). It’s not set by default (JVM default). -
wrapper.java.maxmemory
is the maximum JVM memory size (the-Xmx
). It’s set to 512M by default. -
wrapper.logfile
is the location of the Service Wrapper log file. It’s set to%KARAF_DATA%/log/wrapper.log
by default. -
wrapper.logfile.loglevel
is the Service Wrapper log level. It’s set toINFO
by default. -
wrapper.logfile.maxsize
is the Service Wrapper log file maximum size (before rotation). It’s set to10m
(10MB) by default. -
wrapper.logfile.maxfiles
is the number of Service Wrapper log files created (and rotated). It’s set to5
by default. -
wrapper.syslog.loglevel
is the integration with Unix syslog daemon. By default, it’s set tonone
meaning disabled. -
wrapper.ntservice.name
is Windows service specific and defines the Windows service name. It’s set to thename
option of thewrapper:install
command, orkaraf
by default. -
wrapper.ntservice.displayname
is Windows service specific and defines the Windows service display name. It’s set to thedisplay
option of thewrapper:install
command, orkaraf
by default. -
wrapper.ntservice.description
is Windows service specific and defines the Windows service description. It’s set to thedescription
option of thewrapper:install
command, or empty by default. -
wrapper.ntservice.starttype
is Windows service specific and defines if the Windows service is started automatically with the service, or just on demand. It’s set toAUTO_START
by default, and could be switch toDEMAND_START
.
This is a example of generated etc/karaf-wrapper.conf
file:
# ------------------------------------------------------------------------ # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ------------------------------------------------------------------------ #******************************************************************** # Wrapper Properties #******************************************************************** set.default.JAVA_HOME=/opt/jdk/1.7.0_21 set.default.KARAF_HOME=/home/jbonofre/workspace/karaf/karaf/assemblies/apache-karaf/target/apache-karaf-3.0.5-SNAPSHOT set.default.KARAF_BASE=/home/jbonofre/workspace/karaf/karaf/assemblies/apache-karaf/target/apache-karaf-3.0.5-SNAPSHOT set.default.KARAF_DATA=/home/jbonofre/workspace/karaf/karaf/assemblies/apache-karaf/target/apache-karaf-3.0.5-SNAPSHOT/data set.default.KARAF_ETC=/home/jbonofre/workspace/karaf/karaf/assemblies/apache-karaf/target/apache-karaf-3.0.5-SNAPSHOT/etc # Java Application wrapper.working.dir=%KARAF_BASE% wrapper.java.command=%JAVA_HOME%/bin/java wrapper.java.mainclass=org.apache.karaf.wrapper.internal.Main wrapper.java.classpath.1=%KARAF_HOME%/lib/karaf-wrapper.jar wrapper.java.classpath.2=%KARAF_HOME%/lib/karaf.jar wrapper.java.classpath.3=%KARAF_HOME%/lib/karaf-jaas-boot.jar wrapper.java.classpath.4=%KARAF_HOME%/lib/karaf-wrapper-main.jar wrapper.java.classpath.5=%KARAF_HOME%/lib/karaf-org.osgi.core.jar wrapper.java.library.path.1=%KARAF_HOME%/lib/ # Application Parameters. Add parameters as needed starting from 1 #wrapper.app.parameter.1= # JVM Parameters # note that n is the parameter number starting from 1. wrapper.java.additional.1=-Dkaraf.home=%KARAF_HOME% wrapper.java.additional.2=-Dkaraf.base=%KARAF_BASE% wrapper.java.additional.3=-Dkaraf.data=%KARAF_DATA% wrapper.java.additional.4=-Dkaraf.etc=%KARAF_ETC% wrapper.java.additional.5=-Dcom.sun.management.jmxremote wrapper.java.additional.6=-Dkaraf.startLocalConsole=false wrapper.java.additional.7=-Dkaraf.startRemoteShell=true wrapper.java.additional.8=-Djava.endorsed.dirs=%JAVA_HOME%/jre/lib/endorsed:%JAVA_HOME%/lib/endorsed:%KARAF_HOME%/lib/endorsed wrapper.java.additional.9=-Djava.ext.dirs=%JAVA_HOME%/jre/lib/ext:%JAVA_HOME%/lib/ext:%KARAF_HOME%/lib/ext # Uncomment to enable jmx #wrapper.java.additional.n=-Dcom.sun.management.jmxremote.port=1616 #wrapper.java.additional.n=-Dcom.sun.management.jmxremote.authenticate=false #wrapper.java.additional.n=-Dcom.sun.management.jmxremote.ssl=false # Uncomment to enable YourKit profiling #wrapper.java.additional.n=-Xrunyjpagent # Uncomment to enable remote debugging #wrapper.java.additional.n=-Xdebug -Xnoagent -Djava.compiler=NONE #wrapper.java.additional.n=-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 # Initial Java Heap Size (in MB) #wrapper.java.initmemory=3 # Maximum Java Heap Size (in MB) wrapper.java.maxmemory=512 #******************************************************************** # Wrapper Logging Properties #******************************************************************** # Format of output for the console. (See docs for formats) wrapper.console.format=PM # Log Level for console output. (See docs for log levels) wrapper.console.loglevel=INFO # Log file to use for wrapper output logging. wrapper.logfile=%KARAF_DATA%/log/wrapper.log # Format of output for the log file. (See docs for formats) wrapper.logfile.format=LPTM # Log Level for log file output. (See docs for log levels) wrapper.logfile.loglevel=INFO # Maximum size that the log file will be allowed to grow to before # the log is rolled. Size is specified in bytes. The default value # of 0, disables log rolling. May abbreviate with the 'k' (kb) or # 'm' (mb) suffix. For example: 10m = 10 megabytes. wrapper.logfile.maxsize=10m # Maximum number of rolled log files which will be allowed before old # files are deleted. The default value of 0 implies no limit. wrapper.logfile.maxfiles=5 # Log Level for sys/event log output. (See docs for log levels) wrapper.syslog.loglevel=NONE #******************************************************************** # Wrapper Windows Properties #******************************************************************** # Title to use when running as a console wrapper.console.title=karaf #******************************************************************** # Wrapper Windows NT/2000/XP Service Properties #******************************************************************** # WARNING - Do not modify any of these properties when an application # using this configuration file has been installed as a service. # Please uninstall the service before modifying this section. The # service can then be reinstalled. # Name of the service wrapper.ntservice.name=karaf # Display name of the service wrapper.ntservice.displayname=karaf # Description of the service wrapper.ntservice.description= # Service dependencies. Add dependencies as needed starting from 1 wrapper.ntservice.dependency.1= # Mode in which the service is installed. AUTO_START or DEMAND_START wrapper.ntservice.starttype=AUTO_START # Allow the service to interact with the desktop. wrapper.ntservice.interactive=false
systemd
The Karaf service wrapper also support Linux systemd service.
4.5. Using the console
4.5.1. Available commands
To see a list of the available commands in the console, you can use the help
:
karaf@root()> help COMMANDS bundle bundle:capabilities Displays OSGi capabilities of a given bundles. bundle:classes Displays a list of classes contained in the bundle ...
You have the list of all commands with a short description.
You can use the tab key to get a quick list of all commands:
karaf@root()> Display all 280 possibilities? (y or n) ...
4.5.2. Subshell and completion mode
The commands have a scope and a name. For instance, the command feature:list
has feature
as scope, and list
as name.
Karaf "groups" the commands by scope. Each scope form a subshell.
You can directly execute a command with its full qualified name (scope:name):
karaf@root()> feature:list ...
or enter in a subshell and type the command contextual to the subshell:
karaf@root()> feature karaf@root(feature)> list
You can note that you enter in a subshell directly by typing the subshell name (here feature
). You can "switch" directly from a subshell to another:
karaf@root()> feature karaf@root(feature)> bundle karaf@root(bundle)>
The prompt displays the current subshell between ().
The exit
command goes to the parent subshell:
karaf@root()> feature karaf@root(feature)> exit karaf@root()>
The completion mode defines the behaviour of the tab key and the help command.
You have three different modes available:
-
GLOBAL
-
FIRST
-
SUBSHELL
You can define your default completion mode using the completionMode property in etc/org.apache.karaf.shell.cfg
file. By default, you have:
completionMode = GLOBAL
You can also change the completion mode “on the fly” (while using the Karaf shell console) using the shell:completion
command:
karaf@root()> shell:completion GLOBAL karaf@root()> shell:completion FIRST karaf@root()> shell:completion FIRST
shell:completion
can inform you about the current completion mode used. You can also provide the new completion mode that you want.
GLOBAL completion mode is the default one in Karaf 3.0.0 (mostly for transition purpose).
GLOBAL mode doesn’t really use subshell: it’s the same behavior as in previous Karaf versions.
When you type the tab key, whatever in which subshell you are, the completion will display all commands and all aliases:
karaf@root()> <TAB> karaf@root()> Display all 273 possibilities? (y or n) ... karaf@root()> feature karaf@root(feature)> <TAB> karaf@root(feature)> Display all 273 possibilities? (y or n)
FIRST completion mode is an alternative to the GLOBAL completion mode.
If you type the tab key on the root level subshell, the completion will display the commands and the aliases from all subshells (as in GLOBAL mode). However, if you type the tab key when you are in a subshell, the completion will display only the commands of the current subshell:
karaf@root()> shell:completion FIRST karaf@root()> <TAB> karaf@root()> Display all 273 possibilities? (y or n) ... karaf@root()> feature karaf@root(feature)> <TAB> karaf@root(feature)> info install list repo-add repo-list repo-remove uninstall version-list karaf@root(feature)> exit karaf@root()> log karaf@root(log)> <TAB> karaf@root(log)> clear display exception-display get log set tail
SUBSHELL completion mode is the real subshell mode.
If you type the tab key on the root level, the completion displays the subshell commands (to go into a subshell), and the global aliases. Once you are in a subshell, if you type the TAB key, the completion displays the commands of the current subshell:
karaf@root()> shell:completion SUBSHELL karaf@root()> <TAB> karaf@root()> * bundle cl config dev feature help instance jaas kar la ld lde log log:list man package region service shell ssh system karaf@root()> bundle karaf@root(bundle)> <TAB> karaf@root(bundle)> capabilities classes diag dynamic-import find-class headers info install list refresh requirements resolve restart services start start-level stop uninstall update watch karaf@root(bundle)> exit karaf@root()> camel karaf@root(camel)> <TAB> karaf@root(camel)> backlog-tracer-dump backlog-tracer-info backlog-tracer-start backlog-tracer-stop context-info context-list context-start context-stop endpoint-list route-info route-list route-profile route-reset-stats route-resume route-show route-start route-stop route-suspend
4.5.3. Unix like environment
Karaf console provides a full Unix like environment.
Help or man
We already saw the usage of the help
command to display all commands available.
But you can also use the help
command to get details about a command or
the man
command which is an alias to the help
command.
You can also use another form to get the command help, by using the --help
option to the command.
So these commands
karaf@root()> help feature:list karaf@root()> man feature:list karaf@root()> feature:list --help
All produce the same help output:
DESCRIPTION feature:list Lists all existing features available from the defined repositories. SYNTAX feature:list [options] OPTIONS --help Display this help message -o, --ordered Display a list using alphabetical order -i, --installed Display a list of all installed features only --no-format Disable table rendered output
Completion
When you type the tab key, Karaf tries to complete:
-
subshell
-
commands
-
aliases
-
command arguments
-
command options
Alias
An alias is another name associated to a given command.
The shell:alias
command creates a new alias. For instance, to create the list-installed-features
alias to the actual
feature:list -i
command, you can do:
karaf@root()> alias "list-features-installed = { feature:list -i }" karaf@root()> list-features-installed Name | Version | Installed | Repository | Description --------------------------------------------------------------------------------------------------------- standard | 3.0.0 | x | standard-3.0.0 | Karaf standard feature config | 3.0.0 | x | standard-3.0.0 | Provide OSGi ConfigAdmin support region | 3.0.0 | x | standard-3.0.0 | Provide Region Support package | 3.0.0 | x | standard-3.0.0 | Package commands and mbeans kar | 3.0.0 | x | standard-3.0.0 | Provide KAR (KARaf archive) support ssh | 3.0.0 | x | standard-3.0.0 | Provide a SSHd server on Karaf management | 3.0.0 | x | standard-3.0.0 | Provide a JMX MBeanServer and a set of MBeans in K
At login, the Apache Karaf console reads the etc/shell.init.script
file where you can create your aliases.
It’s similar to a bashrc or profile file on Unix.
ld = { log:display $args } ; lde = { log:exception-display $args } ; la = { bundle:list -t 0 $args } ; ls = { service:list $args } ; cl = { config:list "(service.pid=$args)" } ; halt = { system:shutdown -h -f $args } ; help = { *:help $args | more } ; man = { help $args } ; log:list = { log:get ALL } ;
You can see here the aliases available by default:
-
ld
is a short form to display log (alias tolog:display
command) -
lde
is a short form to display exceptions (alias tolog:exception-display
command) -
la
is a short form to list all bundles (alias tobundle:list -t 0
command) -
ls
is a short form to list all services (alias toservice:list
command) -
cl
is a short form to list all configurations (alias toconfig:list
command) -
halt
is a short form to shutdown Apache Karaf (alias tosystem:shutdown -h -f
command) -
help
is a short form to display help (alias to*:help
command) -
man
is the same as help (alias tohelp
command) -
log:list
displays all loggers and level (alias tolog:get ALL
command)
You can create your own aliases in the etc/shell.init.script
file.
Key binding
Like on most Unix environment, Karaf console support some key bindings:
-
the arrows key to navigate in the commands history
-
CTRL-D to logout/shutdown Karaf
-
CTRL-R to search previously executed command
-
CTRL-U to remove the current line
Pipe
You can pipe the output of one command as input to another one. It’s a pipe, using the | character:
karaf@root()> feature:list | grep -i war war | 3.0.0 | | standard-3.0.0 | Turn Karaf as a full WebContainer
Grep, more, find, …
Karaf console provides some core commands similar to Unix environment:
-
shell:head
displays the first line of the input -
shell:source
executes commands contained in a script -
shell:alias
creates an alias to an existing command -
shell:history
prints the commands history -
shell:cat
displays the content of a file or URL -
shell:if
allows you to use conditions (if, then, else blocks) in script -
shell:tac
captures stdin and returns it as a string -
shell:clear
clears the current console display -
shell:info
prints various information about the current Karaf instance -
shell:tail
displays the last lines of the input -
shell:completion
displays or change the current completion mode -
shell:java
executes a Java application -
shell:threads
prints the current thread -
shell:date
displays the current date (optionally using a format) -
shell:watch
periodically executes a command and refresh the output -
shell:each
executes a closure on a list of arguments -
shell:more
is a file pager -
shell:wc
prints newline, words, and byte counts for each file -
shell:env
gets/sets the value of a shell session variable -
shell:echo
echoes and prints arguments to stdout -
shell:new
creates a new Java object -
shell:edit
calls a text editor on the current file or URL -
shell:printf
formats and prints arguments -
shell:exec
executes a system command -
shell:sleep
sleeps for a bit then wakes up -
shell:grep
prints lines matching the given pattern -
shell:sort
writes sorted concatenation of all files to stdout
You don’t have to use the fully qualified name of the command, you can directly use the command name as long as it is unique. So you can use head instead of shell:head
Again, you can find details and all options of these commands using help
command or --help
option.
Scripting
The Apache Karaf Console supports a complete scripting language, similar to bash or csh on Unix.
The each
(shell:each
) command can iterate in a list:
karaf@root()> list = [1 2 3]; each ($list) { echo $it } 1 2 3
You can create the list yourself (as in the previous example), or some commands can return a list too.
We can note that the console created a "session" variable with the name list
that you can access with $list
.
The $it
variable is an implicit one corresponding to the current object (here the current iterated value from the
list).
When you create a list with []
, Apache Karaf console creates a Java ArrayList. It means that you can use methods
available in the ArrayList objects (like get or size for instance):
karaf@root()> list = ["Hello" world]; echo ($list get 0) ($list get 1) Hello world
We can note here that calling a method on an object is directly using (object method argument)
.
Here ($list get 0)
means $list.get(0)
where $list
is the ArrayList.
The class
notation will display details about the object:
karaf@root()> $list class ... ProtectionDomain ProtectionDomain null null <no principals> java.security.Permissions@6521c24e ( ("java.security.AllPermission" "<all permissions>" "<all actions>") ) Signers null SimpleName ArrayList TypeParameters [E]
You can "cast" a variable to a given type.
karaf@root()> ("hello world" toCharArray) [h, e, l, l, o, , w, o, r, l, d]
If it fails, you will see the casting exception:
karaf@root()> ("hello world" toCharArray)[0] Error executing command: [C cannot be cast to [Ljava.lang.Object;
You can "call" a script using the shell:source
command:
karaf@root> shell:source script.txt True!
where script.txt
contains:
foo = "foo" if { $foo equals "foo" } { echo "True!" }
{warning} The spaces are important when writing script. For instance, the following script is not correct:
if{ $foo equals "foo" } ...
and will fail with:
karaf@root> shell:source script.txt Error executing command: Cannot coerce echo "true!"() to any of []
because a space is missing after the if
statement.
{warning}
As for the aliases, you can create init scripts in the etc/shell.init.script
file.
You can also named you script with an alias. Actually, the aliases are just scripts.
See the Scripting section of the developers guide for details.
4.5.4. Security
The Apache Karaf console supports a Role Based Access Control (RBAC) security mechanism. It means that depending of the user connected to the console, you can define, depending of the user’s groups and roles, the permission to execute some commands, or limit the values allowed for the arguments.
Console security is detailed in the Security section of this guide.
4.6. Remote
Apache Karaf supports a complete remote mechanism allowing you to remotely connect to a running Apache Karaf instance. More over, you can also browse, download, and upload files remotely to a running Apache Karaf instance.
Apache Karaf embeds a complete SSHd server.
4.6.1. SSHd server
When you start Apache Karaf, it enables a remote console that can be accessed over SSH.
This remote console provides all the features of the "local" console, and gives a remote user complete control over the container and services running inside of it. As the "local" console, the remote console is secured by a RBAC mechanism (see the [Security section|security] of the user guide for details).
In addition of the remote console, Apache Karaf also provides a remote filesystem. This remote filesystem can be accessed using a SCP/SFTP client.
Configuration
The configuration of the SSHd server is stored in the etc/org.apache.karaf.shell.cfg
file:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # These properties are used to configure Karaf's ssh shell. # # # Via sshPort and sshHost you define the address you can login into Karaf. # sshPort = 8101 sshHost = 0.0.0.0 # # The sshIdleTimeout defines the inactivity timeout to logout the SSH session. # The sshIdleTimeout is in milliseconds, and the default is set to 30 minutes. # sshIdleTimeout = 1800000 # # sshRealm defines which JAAS domain to use for password authentication. # sshRealm = karaf # # The location of the hostKey file defines where the private/public key of the server # is located. If no file is at the defined location it will be ignored. # hostKey = ${karaf.etc}/host.key # # Self defined key size in 1024, 2048, 3072, or 4096 # If not set, this defaults to 4096. # # keySize = 4096 # # Specify host key algorithm, defaults to RSA # # algorithm = RSA # # Defines the completion mode on the Karaf shell console. The possible values are: # - GLOBAL: it's the same behavior as in previous Karaf releases. The completion displays all commands and all aliases # ignoring if you are in a subshell or not. # - FIRST: the completion displays all commands and all aliases only when you are not in a subshell. When you are # in a subshell, the completion displays only the commands local to the subshell. # - SUBSHELL: the completion displays only the subshells on the root level. When you are in a subshell, the completion # displays only the commands local to the subshell. # This property define the default value when you use the Karaf shell console. # You can change the completion mode directly in the shell console, using shell:completion command. # completionMode = GLOBAL
The etc/org.apache.karaf.shell.cfg
configuration file contains different properties to configure the SSHd server:
-
sshPort
is the port number where the SSHd server is bound (by default, it’s 8101). -
sshHost
is the address of the network interface where the SSHd server is bound. The default value is 0.0.0.0, meaning that the SSHd server is bound on all network interfaces. You can bind on a target interface providing the IP address of the network interface. -
hostKey
is the location of thehost.key
file. By defaut, it usesetc/host.key
. This file stores the public and private key pair of the SSHd server. defined inetc/system.properties
. See the [Security section|security] of this user guide for details. -
keySize
is the key size used by the SSHd server. The possible values are 1024, 2048, 3072, or 4096. The default value is 1024. -
algorithm
is the host key algorithm used by the SSHd server. The possible values are DSA or RSA. The default value is DSA.
The SSHd server configuration can be changed at runtime:
-
by editing the
etc/org.apache.karaf.shell.cfg
configuration file -
by using the
config:*
commands
At runtime, when you change the SSHd server configuration, you have to restart the SSHd server to load the changes. You can do it with:
karaf@root()> bundle:restart -f org.apache.karaf.shell.ssh
The Apache Karaf SSHd server supports key/agent authentication and password authentication.
Console clients
System native clients
The Apache Karaf SSHd server is a pure SSHd server, similar to OpenSSH daemon.
It means that you can use directly a SSH client from your system.
For instance, on Unix, you can directly use OpenSSH:
~$ ssh -p 8101 karaf@localhost Authenticated with partial success. Authenticated with partial success. Authenticated with partial success. Password authentication Password: __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
On Windows, you can use Putty, Kitty, etc.
If you don’t have SSH client installed on your machine, you can use Apache Karaf client.
ssh:ssh
command
Apache Karaf itself provides a SSH client. When you are on the Apache Karaf console, you have the ssh:ssh
command:
karaf@root()> ssh:ssh --help DESCRIPTION ssh:ssh Connects to a remote SSH server SYNTAX ssh:ssh [options] hostname [command] ARGUMENTS hostname The host name to connect to via SSH command Optional command to execute OPTIONS --help Display this help message -p, --port The port to use for SSH connection (defaults to 22) -P, --password The password for remote login -q Quiet Mode. Do not ask for confirmations -l, --username The user name for remote login
Thanks to the ssh:ssh
command, you can connect to another running Apache Karaf instance:
karaf@root()> ssh:ssh -p 8101 karaf@192.168.134.2 Connecting to host 192.168.134.2 on port 8101 Connecting to unknown server. Add this server to known hosts ? (y/n) Storing the server key in known_hosts. Connected __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
When you don’t provide the command
argument to the ssh:ssh
command, you are in the interactive mode: you have
a complete remote console available, where you can type commands, etc.
You can also provide directly a command to execute using the command
argument. For instance, to remotely shutdown
a Apache Karaf instance:
karaf@root()> ssh:ssh -p 8101 karaf@localhost system:shutdown -f Connecting to host localhost on port 8101 Connected
As the ssh:ssh
command is a pure SSH client, so it means that you can connect to a Unix OpenSSH daemon:
karaf@root()> ssh:ssh user@localhost Connecting to host localhost on port 22 Connecting to unknown server. Add this server to known hosts ? (y/n) Storing the server key in known_hosts. Agent authentication failed, falling back to password authentication. Password: Connected Last login: Sun Sep 8 19:21:12 2013 user@server:~$
Apache Karaf client
The ssh:ssh
command requires to be run into a running Apache Karaf console.
For commodity, the ssh:ssh
command is "wrapped" as a standalone client: the bin/client
Unix script (bin\client.bat
on Windows).
bin/client --help Apache Karaf client -a [port] specify the port to connect to -h [host] specify the host to connect to -u [user] specify the user name --help shows this help message -v raise verbosity -r [attempts] retry connection establishment (up to attempts times) -d [delay] intra-retry delay (defaults to 2 seconds) -b batch mode, specify multiple commands via standard input -f [file] read commands from the specified file [commands] commands to run If no commands are specified, the client will be put in an interactive mode
For instance, to connect to local Apache Karaf instance (on the default SSHd server 8101 port), you can directly use
bin/client
Unix script (bin\client.bat
on Windows) without any argument or option:
bin/client Logging in as karaf 343 [pool-2-thread-4] WARN org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at /0.0.0.0:8101 presented unverified key: __ __ ____ / //_/____ __________ _/ __/ / ,< / __ `/ ___/ __ `/ /_ / /| |/ /_/ / / / /_/ / __/ /_/ |_|\__,_/_/ \__,_/_/ Apache Karaf (3.0.0) Hit '<tab>' for a list of available commands and '[cmd] --help' for help on a specific command. Hit 'system:shutdown' to shutdown Karaf. Hit '<ctrl-d>' or type 'logout' to disconnect shell from current session. karaf@root()>
When you don’t provide the command
argument to the bin/client
Unix script (bin\client.bat
on Windows), you are
in the interactive mode: you have a complete remote console available, where you can type commands, etc.
You can also provide directly a command to execute using the command
argument. For instance, to remotely shutdown
a Apache Karaf instance:
bin/client "system:shutdown -f" Logging in as karaf 330 [pool-2-thread-3] WARN org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at /0.0.0.0:8101 presented unverified key:
As the Apache Karaf client is a pure SSH client, you can use to connect to any SSHd daemon (like Unix OpenSSH daemon):
bin/client -a 22 -h localhost -u user Logging in as user 353 [pool-2-thread-2] WARN org.apache.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at localhost/127.0.0.1:22 presented unverified key: Password: Welcome to Ubuntu 13.10 (GNU/Linux 3.11.0-13-generic x86_64) * Documentation: https://help.ubuntu.com/ Last login: Tue Dec 3 18:18:31 2013 from localhost
Logout
When you are connected to a remote Apache Karaf console, you can logout using:
-
using CTRL-D key binding. Note that CTRL-D just logout from the remote console in this case, it doesn’t shutdown the Apache Karaf instance (as CTRL-D does when used on a local console).
-
using
shell:logout
command (or simplylogout
)
Filsystem clients
Apache Karaf SSHd server also provides complete fileystem access via SSH. For security reason, the available filesystem
is limited to KARAF_BASE
directory.
You can use this remote filesystem with any SCP/SFTP compliant clients.
Native SCP/SFTP clients
On Unix, you can directly use scp
command to download/upload files to the Apache Karaf filesystem. For instance,
to retrieve the karaf.log
file remotely:
~$ scp -P 8101 karaf@localhost:/data/log/karaf.log . Authenticated with partial success. Authenticated with partial success. Authenticated with partial success. Password authentication Password: karaf.log
As you have access to the complete KARAF_BASE
directory, you can remotely change the configuration file in the etc
folder, retrieve log files, populate the system
folder.
On Windows, you can use WinSCP to access the Apache Karaf filesystem.
It’s probably easier to use a SFTP complient client.
For instance, on Unix system, you can use lftp
or ncftp
:
$ lftp lftp :~> open -u karaf sftp://localhost:8101 Password: lftp karaf@localhost:~> ls -rw-r--r-- 1 jbonofre jbonofre 27754 Oct 26 10:50 LICENSE -rw-r--r-- 1 jbonofre jbonofre 1919 Dec 3 05:34 NOTICE -rw-r--r-- 1 jbonofre jbonofre 3933 Aug 18 2012 README -rw-r--r-- 1 jbonofre jbonofre 101041 Dec 3 05:34 RELEASE-NOTES drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 12:51 bin drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 18:57 data drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 12:51 demos drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 13:02 deploy drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 17:59 etc drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 13:02 instances drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 13:02 lib -rw-r--r-- 1 jbonofre jbonofre 0 Dec 3 13:02 lock drwxr-xr-x 1 jbonofre jbonofre 4096 Dec 3 12:51 system lftp karaf@localhost:/>
You can also use graphic client like filezilla
, gftp
, nautilus
, etc.
On Windows, you can use filezilla
, WinSCP
, etc.
Apache Maven
Apache Karaf system
folder is the Karaf repository, that use a Maven directory structure. It’s where Apache Karaf
looks for the artifacts (bundles, features, kars, etc).
Using Apache Maven, you can populate the system
folder using the deploy:deploy-file
goal.
For instance, you want to add the Apache ServiceMix facebook4j OSGi bundle, you can do:
mvn deploy:deploy-file -Dfile=org.apache.servicemix.bundles.facebook4j-2.0.2_1.jar -DgroupId=org.apache.servicemix.bundles -DartifactId=org.apache.servicemix.bundles.facebook4j -Dversion=2.0.2_1 -Dpackaging=jar -Durl=scp://localhost:8101/system
Note
|
If you want to turn Apache Karaf as a simple Maven repository, you can use [Apache Karaf Cave. |
4.6.2. JMX MBeanServer
Apache Karaf provides a JMX MBeanServer.
This MBeanServer is available remotely, using any JMX client like jconsole
.
You can find details on the Monitoring section of the user guide.
4.7. Log
Apache Karaf provides a very dynamic and powerful logging system.
It supports:
-
the OSGi Log Service
-
the Apache Log4j framework
-
the Apache Commons Logging framework
-
the Logback framework
-
the SLF4J framework
-
the native Java Util Logging framework
It means that the applications can use any logging framework, Apache Karaf will use the central log system to manage the loggers, appenders, etc.
4.7.1. Configuration files
The initial log configuration is loaded from etc/org.ops4j.pax.logging.cfg
.
This file is a standard Log4j configuration file.
You find the different Log4j element:
-
loggers
-
appenders
-
layouts
You can add your own initial configuration directly in the file.
The default configuration is the following:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # Root logger log4j.rootLogger=INFO, out, osgi:* log4j.throwableRenderer=org.apache.log4j.OsgiThrowableRenderer # CONSOLE appender not used by default log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n # File appender log4j.appender.out=org.apache.log4j.RollingFileAppender log4j.appender.out.layout=org.apache.log4j.PatternLayout log4j.appender.out.layout.ConversionPattern=%d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n log4j.appender.out.file=${karaf.data}/log/karaf.log log4j.appender.out.append=true log4j.appender.out.maxFileSize=1MB log4j.appender.out.maxBackupIndex=10 # Sift appender log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender log4j.appender.sift.key=bundle.name log4j.appender.sift.default=karaf log4j.appender.sift.appender=org.apache.log4j.FileAppender log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout log4j.appender.sift.appender.layout.ConversionPattern=%d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %m%n log4j.appender.sift.appender.file=${karaf.data}/log/$\\{bundle.name\\}.log log4j.appender.sift.appender.append=true
The default configuration only define the ROOT
logger, with INFO
log level, using the out
file appender.
You can change the log level to any Log4j valid values (from the most to less verbose): TRACE, DEBUG, INFO, WARN, ERROR, FATAL.
The osgi:*
appender is a special appender to send the log message to the OSGi Log Service.
A stdout
console appender is pre-configured, but not enabled by default. This appender allows you to display log
messages directly to standard output. It’s interesting if you plan to run Apache Karaf in server mode (without console).
To enable it, you have to add the stdout
appender to the rootLogger
:
log4j.rootLogger=INFO, out, stdout, osgi:*
The out
appender is the default one. It’s rolling file appender that maintain and rotate 10 log files of 1MB each.
The log files are located in data/log/karaf.log
by default.
The sift
appender is not enabled by default. This appender allows you to have one log file per deployed bundle.
By default, the log file name format uses the bundle symbolic name (in the data/log
folder).
You can edit this file at runtime: any change will be reloaded and be effective immediately (no need to restart Apache Karaf).
Another configuration file is used by Apache Karaf: etc/org.apache.karaf.log.cfg
. This files configures the Log Service
used by the log commands (see later).
4.7.2. Commands
Instead of changing the etc/org.ops4j.pax.logging.cfg
file, Apache Karaf provides a set of commands allowing to
dynamically change the log configuration and see the log content:
log:clear
The log:clear
command clears the log entries.
log:display
The log:display
command displays the log entries.
By default, it displays the log entries of the rootLogger
:
karaf@root()> log:display 2013-11-29 19:12:46,208 | INFO | FelixStartLevel | SecurityUtils | 16 - org.apache.sshd.core - 0.9.0 | BouncyCastle not registered, using the default JCE provider 2013-11-29 19:12:47,368 | INFO | FelixStartLevel | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Starting JMX OSGi agent
You can also display the log entries from a specific logger, using the logger
argument:
karaf@root()> log:display ssh 2013-11-29 19:12:46,208 | INFO | FelixStartLevel | SecurityUtils | 16 - org.apache.sshd.core - 0.9.0 | BouncyCastle not registered, using the default JCE provider
By default, all log entries will be displayed. It could be very long if your Apache Karaf container is running since a long time.
You can limit the number of entries to display using the -n
option:
karaf@root()> log:display -n 5 2013-11-30 06:53:24,143 | INFO | JMX OSGi Agent | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering org.osgi.jmx.framework.BundleStateMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=5335370f-9dee-449f-9b1c-cabe74432ed1 2013-11-30 06:53:24,150 | INFO | JMX OSGi Agent | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering org.osgi.jmx.framework.PackageStateMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=5335370f-9dee-449f-9b1c-cabe74432ed1 2013-11-30 06:53:24,150 | INFO | JMX OSGi Agent | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=5335370f-9dee-449f-9b1c-cabe74432ed1 2013-11-30 06:53:24,152 | INFO | JMX OSGi Agent | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=5335370f-9dee-449f-9b1c-cabe74432ed1 2013-11-30 06:53:24,530 | INFO | FelixStartLevel | RegionsPersistenceImpl | 78 - org.apache.karaf.region.persist - 3.0.0 | Loading region digraph persistence
You can also limit the number of entries stored and retain using the size
property in etc/org.apache.karaf.log.cfg
file:
# # The number of log statements to be displayed using log:display. It also defines the number # of lines searched for exceptions using log:display exception. You can override this value # at runtime using -n in log:display. # size = 500
By default, each log level is displayed with a different color: ERROR/FATAL are in red, DEBUG in purple, INFO in cyan, etc.
You can disable the coloring using the --no-color
option.
The log entries format pattern doesn’t use the conversion pattern define in etc/org.ops4j.pax.logging.cfg
file.
By default, it uses the pattern
property defined in etc/org.apache.karaf.log.cfg
.
# # The pattern used to format the log statement when using log:display. This pattern is according # to the log4j layout. You can override this parameter at runtime using log:display with -p. # pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n
You can also change the pattern dynamically (for one execution) using the -p
option:
karaf@root()> log:display -p "%d - %c - %m%n" 2013-11-30 07:01:58,007 - org.apache.sshd.common.util.SecurityUtils - BouncyCastle not registered, using the default JCE provider 2013-11-30 07:01:58,725 - org.apache.aries.jmx.core - Starting JMX OSGi agent 2013-11-30 07:01:58,744 - org.apache.aries.jmx.core - Registering MBean with ObjectName [osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=6361fc65-8df4-4886-b0a6-479df2d61c83] for service with service.id [13] 2013-11-30 07:01:58,747 - org.apache.aries.jmx.core - Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=6361fc65-8df4-4886-b0a6-479df2d61c83
The pattern is a regular Log4j pattern where you can use keywords like %d for the date, %c for the class, %m for the log message, etc.
log:exception-display
The log:exception-display
command displays the last occurred exception.
As for log:display
command, the log:exception-display
command uses the rootLogger
by default, but you can
specify a logger with the logger
argument.
log:get
The log:get
command show the current log level of a logger.
By default, the log level showed is the one from the root logger:
karaf@root()> log:get Logger | Level -------------- ROOT | INFO
You can specify a particular logger using the logger
argument:
karaf@root()> log:get ssh Logger | Level -------------- ssh | INFO
The logger
argument accepts the ALL
keyword to display the log level of all logger (as a list).
For instance, if you have defined your own logger in etc/org.ops4j.pax.logging.cfg
file like this:
log4j.logger.my.logger = DEBUG
you can see the list of loggers with the corresponding log level:
karaf@root()> log:get ALL Logger | Level ----------------- ROOT | INFO my.logger | DEBUG
The log:list
command is an alias to log:get ALL
.
log:log
The log:log
command allows you to manually add a message in the log. It’s interesting when you create Apache Karaf
scripts:
karaf@root()> log:log "Hello World" karaf@root()> log:display 2013-11-30 07:20:16,544 | INFO | Local user karaf | command | 59 - org.apache.karaf.log.command - 3.0.0 | Hello World
By default, the log level is INFO, but you can specify a different log level using the -l
option:
karaf@root()> log:log -l ERROR "Hello World" karaf@root()> log:display 2013-11-30 07:21:38,902 | ERROR | Local user karaf | command | 59 - org.apache.karaf.log.command - 3.0.0 | Hello World
log:set
The log:set
command sets the log level of a logger.
By default, it changes the log level of the rootLogger
:
karaf@root()> log:set DEBUG karaf@root()> log:get Logger | Level -------------- ROOT | DEBUG
You can specify a particular logger using the logger
argument, after the level
one:
karaf@root()> log:set INFO my.logger karaf@root()> log:get my.logger Logger | Level ----------------- my.logger | INFO
The level
argument accepts any Log4j log level: TRACE, DEBUG, INFO, WARN, ERROR, FATAL.
By it also accepts the DEFAULT special keyword.
The purpose of the DEFAULT keyword is to delete the current level of the logger (and only the level, the other properties like appender are not deleted) in order to use the level of the logger parent (logger are hierarchical).
For instance, you have defined the following loggers (in etc/org.ops4j.pax.logging.cfg
file):
rootLogger=INFO,out,osgi:* my.logger=INFO,appender1 my.logger.custom=DEBUG,appender2
You can change the level of my.logger.custom
logger:
karaf@root()> log:set INFO my.logger.custom
Now we have:
rootLogger=INFO,out,osgi:* my.logger=INFO,appender1 my.logger.custom=INFO,appender2
You can use the DEFAULT keyword on my.logger.custom
logger to remove the level:
karaf@root()> log:set DEFAULT my.logger.custom
Now we have:
rootLogger=INFO,out,osgi:* my.logger=INFO,appender1 my.logger.custom=appender2
It means that, at runtime, the my.logger.custom
logger uses the level of its parent my.logger
, so INFO
.
Now, if we use DEFAULT keyword with the my.logger
logger:
karaf@root()> log:set DEFAULT my.logger
We have:
rootLogger=INFO,out,osgi:* my.logger=appender1 my.logger.custom=appender2
So, both my.logger.custom
and my.logger
use the log level of the parent rootLogger
.
It’s not possible to use DEFAULT keyword with the rootLogger
and it doesn’t have parent.
log:tail
The log:tail
is exactly the same as log:display
but it continuously displays the log entries.
You can use the same options and arguments as for the log:display
command.
By default, it displays the entries from the rootLogger
:
karaf@root()> log:tail 2013-11-30 07:40:28,152 | INFO | FelixStartLevel | SecurityUtils | 16 - org.apache.sshd.core - 0.9.0 | BouncyCastle not registered, using the default JCE provider 2013-11-30 07:40:28,909 | INFO | FelixStartLevel | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Starting JMX OSGi agent 2013-11-30 07:40:28,928 | INFO | FelixStartLevel | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering MBean with ObjectName [osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=b44a44b7-41cd-498f-936d-3b12d7aafa7b] for service with service.id [13] 2013-11-30 07:40:28,936 | INFO | JMX OSGi Agent | core | 68 - org.apache.aries.jmx.core - 1.1.1 | Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer com.sun.jmx.mbeanserver.JmxMBeanServer@27cc75cb with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=b44a44b7-41cd-498f-936d-3b12d7aafa7b
To exit from the log:tail
command, just type CTRL-C.
4.7.3. JMX LogMBean
All actions that you can perform with the log:*
command can be performed using the LogMBean.
The LogMBean object name is org.apache.karaf:type=log,name=*
.
Attributes
-
Level
attribute is the level of the ROOT logger.
Operations
-
getLevel(logger)
to get the log level of a specific logger. As this operation supports the ALL keyword, it returns a Map with the level of each logger. -
setLevel(level, logger)
to set the log level of a specific logger. This operation supports the DEFAULT keyword as for thelog:set
command.
4.7.4. Advanced configuration
Filters
You can use filters on appender. Filters allow log events to be evaluated to determine if or how they should be published.
Log4j provides ready to use filters:
-
The DenyAllFilter (
org.apache.log4j.varia.DenyAllFilter
) drops all logging events. You can add this filter to the end of a filter chain to switch from the default "accept all unless instructed otherwise" filtering behaviour to a "deny all unless instructed otherwise" behaviour. -
The LevelMatchFilter (
org.apache.log4j.varia.LevelMatchFilter
is a very simple filter based on level matching. The filter admits two optionsLevelToMatch
andAcceptOnMatch
. If there is an exact match between the value of theLevelToMatch
option and the level of the logging event, then the event is accepted in case theAcceptOnMatch
option value is set totrue
. Else, if theAcceptOnMatch
option value is set tofalse
, the log event is rejected. -
The LevelRangeFilter (
org.apache.log4j.varia.LevelRangeFilter
is a very simple filter based on level matching, which can be used to reject messages with priorities outside a certain range. The filter admits three optionsLevelMin
,LevelMax
andAcceptOnMatch
. If the log event level is betweenLevelMin
andLevelMax
, the log event is accepted ifAcceptOnMatch
is true, or rejected ifAcceptOnMatch
is false. -
The StringMatchFilter (
org.apache.log4j.varia.StringMatchFilter
) is a very simple filter based on string matching. The filter admits two optionsStringToMatch
andAcceptOnMatch
. If there is a match between theStringToMatch
and the log event message, the log event is accepted ifAcceptOnMatch
is true, or rejected ifAcceptOnMatch
is false.
The filter is defined directly on the appender, in the etc/org.ops4j.pax.logging.cfg
configuration file.
The format to use it:
log4j.appender.[appender-name].filter.[filter-name]=[filter-class] log4j.appender.[appender-name].filter.[filter-name].[option]=[value]
For instance, you can use the f1
LevelRangeFilter on the out
default appender:
log4j.appender.out.filter.f1=org.apache.log4j.varia.LevelRangeFilter log4j.appender.out.filter.f1.LevelMax=FATAL log4j.appender.out.filter.f1.LevelMin=DEBUG
Thanks to this filter, the log files generated by the out
appender will contain only log messages with a level
between DEBUG and FATAL (the log events with TRACE as level are rejected).
Nested appenders
A nested appender is a special kind of appender that you use "inside" another appender. It allows you to create some kind of "routing" between a chain of appenders.
The most used "nested compliant" appender are:
-
The AsyncAppender (
org.apache.log4j.AsyncAppender
) logs events asynchronously. This appender collects the events and dispatch them to all the appenders that are attached to it. -
The RewriteAppender (
org.apache.log4j.rewrite.RewriteAppender
) forwards log events to another appender after possibly rewriting the log event.
This kind of appender accepts an appenders
property in the appender definition:
log4j.appender.[appender-name].appenders=[comma-separated-list-of-appender-names]
For instance, you can create a AsyncAppender named async
and asynchronously dispatch the log events to a JMS appender:
log4j.appender.async=org.apache.log4j.AsyncAppender log4j.appender.async.appenders=jms log4j.appender.jms=org.apache.log4j.net.JMSAppender ...
Error handlers
Sometime, appenders can fail. For instance, a RollingFileAppender tries to write on the filesystem but the filesystem is full, or a JMS appender tries to send a message but the JMS broker is not there.
As log can be very critical to you, you have to be inform that the log appender failed.
It’s the purpose of the error handlers. Appenders may delegate their error handling to error handlers, giving a chance to react to this appender errors.
You have two error handlers available:
-
The OnlyOnceErrorHandler (
org.apache.log4j.helpers.OnlyOnceErrorHandler
) implements log4j’s default error handling policy which consists of emitting a message for the first error in an appender and ignoring all following errors. The error message is printed onSystem.err
. This policy aims at protecting an otherwise working application from being flooded with error messages when logging fails. -
The FallbackErrorHandler (
org.apache.log4j.varia.FallbackErrorHandler
) allows a secondary appender to take over if the primary appender fails. The error message is printed onSystem.err
, and logged in the secondary appender.
You can define the error handler that you want to use for each appender using the errorhandler
property on the appender definition itself:
log4j.appender.[appender-name].errorhandler=[error-handler-class] log4j.appender.[appender-name].errorhandler.root-ref=[true|false] log4j.appender.[appender-name].errorhandler.logger-ref=[logger-ref] log4j.appender.[appender-name].errorhandler.appender-ref=[appender-ref]
OSGi specific MDC attributes
The sift
appender is a OSGi oriented appender allowing you to split the log events based on MDC (Mapped Diagnostic Context) attributes.
MDC allows you to distinguish the different source of log events.
The sift
appender provides OSGi oritend MDC attributes by default:
-
bundle.id
is the bundle ID -
bundle.name
is the bundle symbolic name -
bundle.version
is the bundle version
You can use these MDC properties to create a log file per bundle:
log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender log4j.appender.sift.key=bundle.name log4j.appender.sift.default=karaf log4j.appender.sift.appender=org.apache.log4j.FileAppender log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout log4j.appender.sift.appender.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t | %-32.32c{1} | %-32.32C %4L | %m%n log4j.appender.sift.appender.file=${karaf.data}/log/$\\{bundle.name\\}.log log4j.appender.sift.appender.append=true
Enhanced OSGi stack trace renderer
By default, Apache Karaf provides a special stack trace renderer, adding some OSGi specific specific information.
In the stack trace, in addition of the class throwing the exception, you can find a pattern [id:name:version]
at the
end of each stack trace line, where:
-
id
is the bundle ID -
name
is the bundle name -
version
is the bundle version
It’s very helpful to diagnosing the source of an issue.
For instance, in the following IllegalArgumentException stack trace, we can see the OSGi details about the source of the exception:
java.lang.IllegalArgumentException: Command not found: *:foo at org.apache.felix.gogo.runtime.shell.Closure.execute(Closure.java:225)[21:org.apache.karaf.shell.console:3.0.0] at org.apache.felix.gogo.runtime.shell.Closure.executeStatement(Closure.java:162)[21:org.apache.karaf.shell.console:3.0.0] at org.apache.felix.gogo.runtime.shell.Pipe.run(Pipe.java:101)[21:org.apache.karaf.shell.console:3.0.0] at org.apache.felix.gogo.runtime.shell.Closure.execute(Closure.java:79)[21:org.apache.karaf.shell.console:3.0.0] at org.apache.felix.gogo.runtime.shell.CommandSessionImpl.execute(CommandSessionImpl.java:71)[21:org.apache.karaf.shell.console:3.0.0] at org.apache.karaf.shell.console.jline.Console.run(Console.java:169)[21:org.apache.karaf.shell.console:3.0.0] at java.lang.Thread.run(Thread.java:637)[:1.7.0_21]
Custom appenders
You can use your own appenders in Apache Karaf.
The easiest way to do that is to package your appender as an OSGi bundle and attach it as a fragment of the
org.ops4j.pax.logging.pax-logging-service
bundle.
For instance, you create MyAppender
:
public class MyAppender extends AppenderSkeleton { ... }
You compile and package as an OSGi bundle containing a MANIFEST looking like:
Manifest: Bundle-SymbolicName: org.mydomain.myappender Fragment-Host: org.ops4j.pax.logging.pax-logging-service ...
Copy your bundle in the Apache Karaf system
folder. The system
folder uses a standard Maven directory layout: groupId/artifactId/version.
In the etc/startup.properties
configuration file, you define your bundle in the list before the pax-logging-service bundle.
You have to restart Apache Karaf with a clean run (purging the data
folder) in order to reload the system bundles.
You can now use your appender directly in etc/org.ops4j.pax.logging.cfg
configuration file.
4.8. Configuration
4.8.1. Files
Apache Karaf stores and loads all configuration in files located in the etc
folder.
By default, the etc
folder is located relatively to the KARAF_BASE
folder. You can define another location
using the KARAF_ETC
variable.
Each configuration is identified by a ID (the ConfigAdmin PID). The configuration files name follows the pid.cfg
name convention.
For instance, etc/org.apache.karaf.shell.cfg
means that this file is the file used by the configuration with
org.apache.karaf.shell
as PID.
A configuration file is a properties file containing key/value pairs:
property=value
In Apache Karaf, a configuration is PID with a set of properties attached.
Apache Karaf automatically loads all *.cfg
files from the etc
folder.
You can configure the behaviour of the configuration files using some dedicated properties in the
etc/config.properties
configuration file:
... # # Configuration FileMonitor properties # felix.fileinstall.enableConfigSave = true felix.fileinstall.dir = ${karaf.etc} felix.fileinstall.filter = .*\\.cfg felix.fileinstall.poll = 1000 felix.fileinstall.noInitialDelay = true felix.fileinstall.log.level = 3 ...
-
felix.fileinstall.enableConfigSave
flush back in the configuration file the changes performed directly on the configuration service (ConfigAdmin). Iftrue
, any change (usingconfig:*
commands, MBeans, OSGi service) is persisted back in the configuration false. Default istrue
. -
felix.fileinstall.dir
is the directory where Apache Karaf is looking for configuration files. Default is${karaf.etc
} meaning the value of theKARAF_ETC
variable. -
felix.fileinstall.filter
is the file name pattern used to load only some configuration files. Only files matching the pattern will be loaded. Default value is.*\\.cfg
meaning *.cfg files. -
felix.fileinstall.poll
is the polling interval (in milliseconds). Default value is1000
meaning that Apache Karaf "re-loads" the configuration files every second. -
felix.fileinstall.noInitialDelay
is a flag indicating if the configuration file polling starts as soon as Apache Karaf starts or wait for a certain time. Iftrue
, Apache Karaf polls the configuration files as soon as the configuration service starts. -
felix.fileinstall.log.level
is the log message verbosity level of the configuration polling service. More this value is high, more verbose the configuration service is.
You can change the configuration at runtime by directly editiing the configuration file.
You can also do the same using the config:*
commands or the ConfigMBean.
4.8.2. config:*
commands
Apache Karaf provides a set of commands to manage the configuration.
config:list
config:list
displays the list of all configurations available, or the properties in a given configuration (PID).
Without the query
argument, the config:list
command display all configurations, with PID, attached bundle and
properties defined in the configuration:
karaf@root()> config:list ---------------------------------------------------------------- Pid: org.apache.karaf.service.acl.command.system.start-level BundleLocation: mvn:org.apache.karaf.shell/org.apache.karaf.shell.console/3.0.0 Properties: service.guard = (&(osgi.command.scope=system)(osgi.command.function=start-level)) * = * start-level = admin # admin can set any start level, including < 100 start-level[/[^0-9]*/] = viewer # viewer can obtain the current start level execute[/.*/,/[^0-9]*/] = viewer # viewer can obtain the current start level execute = admin # admin can set any start level, including < 100 service.pid = org.apache.karaf.service.acl.command.system.start-level start-level[/.*[0-9][0-9][0-9]+.*/] = manager # manager can set startlevels above 100 execute[/.*/,/.*[0-9][0-9][0-9]+.*/] = manager # manager can set startlevels above 100 ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg ...
The query
argument accepts a query using a LDAP syntax.
For instance, you can display details on one specific configuration using the following filter:
karaf@root()> config:list "(service.pid=org.apache.karaf.log)" ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
config:edit
config:edit
is the first command to do when you want to change a configuration. config:edit
command put you
in edition mode for a given configuration.
For instance, you can edit the org.apache.karaf.log
configuration:
karaf@root()> config:edit org.apache.karaf.log
The config:edit
command doesn’t display anything, it just puts you in configuration edit mode. You are now ready
to use other config commands (like config:property-append
, config:property-delete
, config:property-set
, …).
If you provide a configuration PID that doesn’t exist yet, Apache Karaf will create a new configuration (and so a new configuration file) automatically.
All changes that you do in configuration edit mode are store in your console session: the changes are not directly
applied in the configuration. It allows you to "commit" the changes (see config:update
command) or "rollback" and
cancel your changes (see config:cancel
command).
config:property-list
The config:property-list
lists the properties for the currently edited configuration.
Assuming that you edited the org.apache.karaf.log
configuration, you can do:
karaf@root()> config:property-list service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
config:property-set
The config:property-set
command update the value of a given property in the currently edited configuration.
For instance, to change the value of the size
property of previously edited org.apache.karaf.log
configuration,
you can do:
karaf@root()> config:property-set size 1000 karaf@root()> config:property-list service.pid = org.apache.karaf.log size = 1000 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
If the property doesn’t exist, the config:property-set
command creates the property.
You can use config:property-set
command outside the configuration edit mode, by specifying the -p
(for configuration pid) option:
karaf@root()> config:property-set -p org.apache.karaf.log size 1000 karaf@root()> config:list "(service.pid=org.apache.karaf.log)" ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 1000 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
Note
|
Using the |
config:property-append
The config:property-append
is similar to config:property-set
command, but instead of completely replacing the
property value, it appends a string at the end of the property value.
For instance, to add 1 at the end of the value of the size
property in org.apache.karaf.log
configuration
(and so have 5001 for the value instead of 500), you can do:
karaf@root()> config:property-append size 1 karaf@root()> config:property-list service.pid = org.apache.karaf.log size = 5001 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
Like the config:property-set
command, if the property doesn’t exist, the config:property-set
command creates
the property.
You can use the config:property-append
command outside the configuration edit mode, by specifying the -p
(for configuration pid) option:
karaf@root()> config:property-append -p org.apache.karaf.log size 1 karaf@root()> config:list "(service.pid=org.apache.karaf.log)" ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 5001 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
Note
|
Using the |
config:property-delete
The config:property-delete
command delete a property in the currently edited configuration.
For instance, you previously added a test
property in org.apache.karaf.log
configuration. To delete this test
property, you do:
karaf@root()> config:property-set test test karaf@root()> config:property-list service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg test = test karaf@root()> config:property-delete test karaf@root()> config:property-list service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
You can use the config:property-delete
command outside the configuration edit mode, by specifying the -p
(for configuration pid) option:
karaf@root()> config:property-delete -p org.apache.karaf.log test
config:update
and config:cancel
When you are in the configuration edit mode, all changes that you do using config:property*
commands are stored in "memory"
(actually in the console session).
Thanks to that, you can "commit" your changes using the config:update
command. The config:update
command will
commit your changes, update the configuration, and (if possible) update the configuration files.
For instance, after changing org.apache.karaf.log
configuration with some config:property*
commands, you have
to commit your change like this:
karaf@root()> config:edit org.apache.karaf.log karaf@root()> config:property-set test test karaf@root()> config:update karaf@root()> config:list "(service.pid=org.apache.karaf.log)" ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg test = test
On the other hand, if you want to "rollback" your changes, you can use the config:cancel
command. It will cancel all
changes that you did, and return of the configuration state just before the config:edit
command. The config:cancel
exits from the edit mode.
For instance, you added the test property in the org.apache.karaf.log
configuration, but it was a mistake:
karaf@root()> config:edit org.apache.karaf.log karaf@root()> config:property-set test test karaf@root()> config:cancel karaf@root()> config:list "(service.pid=org.apache.karaf.log)" ---------------------------------------------------------------- Pid: org.apache.karaf.log BundleLocation: mvn:org.apache.karaf.log/org.apache.karaf.log.core/3.0.0 Properties: service.pid = org.apache.karaf.log size = 500 pattern = %d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n felix.fileinstall.filename = file:/opt/apache-karaf-3.0.0/etc/org.apache.karaf.log.cfg
config:delete
The config:delete
command completely delete an existing configuration. You don’t have to be in edit mode to delete
a configuration.
For instance, you added my.config
configuration:
karaf@root()> config:edit my.config karaf@root()> config:property-set test test karaf@root()> config:update karaf@root()> config:list "(service.pid=my.config)" ---------------------------------------------------------------- Pid: my.config BundleLocation: null Properties: service.pid = my.config test = test
You can delete the my.config
configuration (including all properties in the configuration) using the config:delete
command:
karaf@root()> config:delete my.config karaf@root()> config:list "(service.pid=my.config)" karaf@root()>
4.8.3. JMX ConfigMBean
On the JMX layer, you have a MBean dedicated to the management of the configurations: the ConfigMBean.
The ConfigMBean object name is: org.apache.karaf:type=config,name=*
.
Attributes
The Configs
attribute is a list of all configuration PIDs.
Operations
-
listProperties(pid)
returns the list of properties (property=value formatted) for the configurationpid
. -
deleteProperty(pid, property)
deletes theproperty
from the configurationpid
. -
appendProperty(pid, property, value)
appendsvalue
at the end of the value of theproperty
of the configurationpid
. -
setProperty(pid, property, value)
setsvalue
for the value of theproperty
of the configurationpid
. -
delete(pid)
deletes the configuration identified by thepid
. -
create(pid)
creates an empty (without any property) configuration withpid
. -
update(pid, properties)
updates a configuration identified withpid
with the providedproperties
map.
4.9. Artifacts repositories and URLs
The main information provided by a feature is the set of OSGi bundles that defines the application. Such bundles are URLs pointing to the actual bundle jars. For example, one would write the following definition:
<bundle>http://repo1.maven.org/maven2/org/apache/servicemix/nmr/org.apache.servicemix.nmr.api/1.0.0-m2/org.apache.servicemix.nmr.api-1.0.0-m2.jar</bundle>
Doing this will make sure the above bundle is installed while installing the feature.
However, Karaf provides several URL handlers, in addition to the usual ones (file, http, etc…). One of these is the Maven URL handler, which allow reusing maven repositories to point to the bundles.
You can deploy bundles from file system without using Maven
As we can use file: as protocol handler to deploy bundles, you can use the following syntax to deploy bundles when they are located in a directory which is not available using Maven
<bundle>file:base/bundles/org.apache.servicemix.nmr.api-1.0.0-m2.jar</bundle>
Note
|
The path is relative to the Apache Karaf installation directory |
4.9.1. Maven URL Handler
The equivalent of the above bundle would be:
<bundle>mvn:org.apache.servicemix.nmr/org.apache.servicemix.nmr.api/1.0.0-m2</bundle>
In addition to being less verbose, the Maven url handlers can also resolve snapshots and can use a local copy of the jar if one is available in your Maven local repository.
The org.ops4j.pax.url.mvn
bundle resolves mvn
URLs. It can be configured using the file etc/org.ops4j.pax.url.cfg
The most important property is :
-
org.ops4j.pax.url.mvn.repositories
: Comma separated list of repository remote repository URLs that are checked in order of occurence when resolving maven artifacts
By default, snapshots are disabled. To enable an URL for snapshots append @snapshots to a repository entry. For example
http://www.example.org/repo@snapshots
Repositories on the local machine are supported through file:/
URLs.
4.10. Provisioning
Apache Karaf is OSGi powered container.
It natively supports the deployment of OSGi applications.
An OSGi application is a set of OSGi bundles. An OSGi bundles is a regular jar file, with additional metadata in the jar MANIFEST.
In OSGi, a bundle can depend to other bundles. So, it means that to deploy an OSGi application, most of the time, you have to firstly deploy a lot of other bundles required by the application.
So, you have to find these bundles first, install the bundles. Again, these "dependency" bundles may require other bundles to satisfy their own dependencies.
More over, typically, an application requires configuration (see the [Configuration section|configuration] of the user guide). So, before being able to start your application, in addition of the dependency bundles, you have to create or deploy the configuration.
Deploying all the requirements (bundles and configurations) of an application into a container is called the "provisioning".
As we can see, the provisioning of an application can be very long and fastidious.
Apache Karaf provides a simple and flexible way to provision applications.
In Apache Karaf, the application provisioning is an Apache Karaf "feature".
A feature describes an application as:
-
a name
-
a version
-
a optional description (eventually with a long description)
-
a set of bundles
-
optionally a set configurations or configuration files
-
optionally a set of dependency features
When you install a feature, Apache Karaf installs all resources described in the feature. It means that it will automatically resolves and installs all bundles, configurations, and dependency features described in the feature.
4.10.1. Features repositories
The features are described in a features XML descriptor. This XML file contains the description of a set of features.
A features XML descriptor is named a "features repository". Before being able to install a feature, you have to register
the features repository that provides the feature (using feature:repo-add
command or FeatureMBean as described later).
For instance, the following XML file (or "features repository") describes the feature1
and feature2
features:
<features xmlns="http://karaf.apache.org/xmlns/features/v1.2.0"> <feature name="feature1" version="1.0.0"> <bundle>...</bundle> <bundle>...</bundle> </feature> <feature name="feature2" version="1.1.0"> <feature>feature1</feature> <bundle>...</bundle> </feature> </features>
We can note that the features XML has a schema. Take a look on [Features XML Schema section|provisioning-schema] of the user guide
for details.
The feature1
feature is available in version 1.0.0
, and contains two bundles. The <bundle/>
element contains a URL
to the bundle artifact (see [Artifacts repositories and URLs section|urls] for details). If you install the feature1
feature
(using feature:install
or the FeatureMBean as described later), Apache Karaf will automatically installs the two bundles
described.
The feature2
feature is available in version 1.1.0
, and contains a reference to the feature1
feature and a bundle.
The <feature/>
element contains the name of a feature. A specific feature version can be defined using the version
attribute to the <feature/>
element (<feature version="1.0.0">feature1</feature>
). If the version
attribute is
not specified, Apache Karaf will install the latest version available. If you install the feature2
feature (using feature:install
or the FeatureMBean as described later), Apache Karaf will automatically installs feature1
(if it’s not already installed)
and the bundle.
A feature repository is registered using the URL to the features XML file.
The features state is stored in the Apache Karaf cache (in the KARAF_DATA
folder). You can restart Apache Karaf, the
previously installed features remain installed and available after restart.
If you do a clean restart or you delete the Apache Karaf cache (delete the KARAF_DATA
folder), all previously features
repositories registered and features installed will be lost: you will have to register the features repositories and install
features by hand again.
To prevent this behaviour, you can specify features as boot features.
4.10.2. Boot features
You can describe some features as boot features. A boot feature will be automatically install by Apache Karaf, even if it has
not been previously installed using feature:install
or FeatureMBean.
Apache Karaf features configuration is located in the etc/org.apache.karaf.features.cfg
configuration file.
This configuration file contains the two properties to use to define boot features:
-
featuresRepositories
contains a list (coma separated) of features repositories (features XML) URLs. -
featuresBoot
contains a list (come separated) of features to install at boot.
4.10.3. Features upgrade
Right now, Apache Karaf doesn’t provide complete upgrade cycle for features.
Basically, a feature upgrade means:
-
Uninstall the features first (eventually providing the feature version to uninstall), and the features repository.
-
Register the new version of the features repository and install the features with the target version.
4.10.4. Feature bundles
Start Level
By default, the bundles deployed by a feature will have a start-level equals to the value defined in the etc/config.properties
configuration file, in the karaf.startlevel.bundle
property.
This value can be "overrided" by the start-level
attribute of the <bundle/>
element, in the features XML.
<feature name="my-project" version="1.0.0"> <bundle start-level="80">mvn:com.mycompany.myproject/myproject-dao</bundle> <bundle start-level="85">mvn:com.mycompany.myproject/myproject-service</bundle> </feature>
The start-level attribute insure that the myproject-dao
bundle is started before the bundles that use it.
Instead of using start-level, a better solution is to simply let the OSGi framework know what your dependencies are by defining the packages or services you need. It is more robust than setting start levels.
Start and stop
You can install a bundle without starting it. By default, the bundles in a feature are automatically started.
A feature can specify that a bundle should not be started automatically (the bundle stays in resolved state).
To do so, a feature can specify the start
attribute to false in the <bundle/>
element:
<feature name="my-project" version="1.0.0"> <bundle start-level="80" start="false">mvn:com.mycompany.myproject/myproject-dao</bundle> <bundle start-level="85" start="false">mvn:com.mycompany.myproject/myproject-service</bundle> </feature>
Note
|
Before Apache Karaf 3.0.0 the start-level was not considered during the feature startup, but only the order in which bundles
are defined in your feature.xml.
Starting with Apache Karaf 3.0.0, the start-level is considered correctly.
If you need to use the old behavior you can uncomment and set the |
Dependency
A bundle can be flagged as being a dependency, using the dependency
attribute set to true on the <bundle/>
element.
This information can be used by resolvers to compute the full list of bundles to be installed.
4.10.5. Dependent features
A feature can depend to a set of other features:
<feature name="my-project" version="1.0.0"> <feature>other</feature> <bundle start-level="80" start="false">mvn:com.mycompany.myproject/myproject-dao</bundle> <bundle start-level="85" start="false">mvn:com.mycompany.myproject/myproject-service</bundle> </feature>
When the my-project
feature will be installed, the other
feature will be automatically installed as well.
It’s possible to define a version range for a dependent feature:
<feature name="spring-dm"> <feature version="[2.5.6,4)">spring</feature> ... </feature>
The feature with the highest version available in the range will be installed.
If a single version is specified, this version will be chosen.
If nothing is specified, the highest available will be installed.
4.10.6. Feature configurations
The <config/>
element in a feature XML allows a feature to create and/or populate a configuration (identified by a configuration PID).
<config name="com.foo.bar"> myProperty = myValue </config>
The name
attribute of the <config/>
element corresponds to the configuration PID (see the [Configuration section|configuration] for details).
The installation of the feature will have the same effect as dropping a file named com.foo.bar.cfg
in the etc
folder.
The content of the <config/>
element is a set of properties, following the key=value standard.
4.10.7. Feature configuration files
Instead of using the <config/>
element, a feature can specify <configfile/>
elements.
<configfile finalname="/etc/myfile.cfg" override="false">URL</configfile>
Instead of directly manipulating the Apache Karaf configuration layer (as when using the <config/>
element), the
<configfile/>
element takes directly a file specified by a URL, and copy the file in the location specified by the
finalname
attribute. The location is relative from the KARAF_BASE
variable. If the file is already present at
the desired location it is kept and the deployment of the configuration file is skipped, as a already existing file might
contain customization. This behaviour can be overriden by override
set to true.
The file URL is any URL supported by Apache Karaf (see the [Artifacts repositories and URLs|urls] of the user guide for details).
4.10.8. Feature resolver
A feature accepts a resolver
attribute:
<feature name="my-project" version="1.0.0" resolver="(obr)"> ... </feature>
This resolver
attribute forces the usage of a specific resolver, instead of the default resolution process.
A resolver is used to obtain the list of bundles to install, when installing the feature.
The default resolver simply returns the list of bundles as described by the <bundle/>
elements in a feature.
You can install a OBR (OSGi Bundle Repository) resolver instead of the default one. The OBR resolver use the OBR service to get the list of bundles to install (see the [OBR section|obr] of the user guide for details).
4.10.9. Commands
feature:repo-list
The feature:repo-list
command lists all registered features repository:
karaf@root()> feature:repo-list Repository | URL ------------------------------------------------------------------------------------------------ standard-3.0.0 | mvn:org.apache.karaf.features/standard/3.0.0/xml/features enterprise-3.0.0 | mvn:org.apache.karaf.features/enterprise/3.0.0/xml/features org.ops4j.pax.web-3.0.5 | mvn:org.ops4j.pax.web/pax-web-features/3.0.5/xml/features spring-3.0.0 | mvn:org.apache.karaf.features/spring/3.0.0/xml/features
Each repository has a name and the URL to the features XML.
Apache Karaf parses the features XML when you register the features repository URL (using feature:repo-add
command
or the FeatureMBean as described later). If you want to force Apache Karaf to reload the features repository URL (and
so update the features definition), you can use the -r
option:
karaf@root()> feature:repo-list -r Reloading all repositories from their urls Repository | URL ------------------------------------------------------------------------------------------------ standard-3.0.0 | mvn:org.apache.karaf.features/standard/3.0.0/xml/features org.ops4j.pax.web-3.0.5 | mvn:org.ops4j.pax.web/pax-web-features/3.0.5/xml/features enterprise-3.0.0 | mvn:org.apache.karaf.features/enterprise/3.0.0/xml/features spring-3.0.0 | mvn:org.apache.karaf.features/spring/3.0.0/xml/features
feature:repo-add
To register a features repository (and so having new features available in Apache Karaf), you have to use the
feature:repo-add
command.
The feature:repo-add
command requires the name/url
argument. This argument accepts:
-
a feature repository URL. It’s an URL directly to the features XML file. Any URL described in the [Artifacts repositories and URLs section|urls] of the user guide is supported.
-
a feature repository name defined in the
etc/org.apache.karaf.features.repos.cfg
configuration file.
The etc/org.apache.karaf.features.repos.cfg
defines a list of "pre-installed/available" features repositories:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # This file describes the features repository URL # It could be directly installed using feature:repo-add command # cellar = org.apache.karaf.cellar:apache-karaf-cellar:xml:features:(0,] camel = org.apache.camel.karaf:apache-camel:xml:features:(0,] camel-extras = org.apache-extras.camel-extra.karaf:camel-extra:xml:features:(0,] cxf = org.apache.cxf.karaf:apache-cxf:xml:features:(0,] cxf-dosgi = org.apache.cxf.dosgi:cxf-dosgi:xml:features:(0,] activemq = org.apache.activemq:activemq-karaf:xml:features:(0,] jclouds = org.jclouds.karaf:jclouds-karaf:xml:features:(0,] openejb = org.apache.openejb:openejb-feature:xml:features:(0,] wicket = org.ops4j.pax.wicket:features:xml:features:(0,] hawtio = io.hawt:hawtio-karaf:xml:features:(0,]
You can directly provide a features repository name to the feature:repo-add
command. For install, to install Apache Karaf Cellar, you can do:
karaf@root()> feature:repo-add cellar Adding feature url mvn:org.apache.karaf.cellar/apache-karaf-cellar/LATEST/xml/features
When you don’t provide the optional version
argument, Apache Karaf installs the latest version of the features repository available.
You can specify a target version with the version
argument:
karaf@root()> feature:repo-add cellar 2.3.1 Adding feature url mvn:org.apache.karaf.cellar/apache-karaf-cellar/2.3.1/xml/features
Instead of providing a features repository name defined in the etc/org.apache.karaf.features.repos.cfg
configuration file,
you can directly provide the features repository URL to the feature:repo-add
command:
karaf@root()> feature:repo-add mvn:org.apache.karaf.cellar/apache-karaf-cellar/2.3.1/xml/features Adding feature url mvn:org.apache.karaf.cellar/apache-karaf-cellar/2.3.1/xml/features
By default, the feature:repo-add
command just registers the features repository, it doesn’t install any feature.
If you specify the -i
option, the feature:repo-add
command registers the features repository and installs all
features described in this features repository:
karaf@root()> feature:repo-add -i cellar
feature:repo-refresh
Apache Karaf parses the features repository XML when you register it (using feature:repo-add
command or the FeatureMBean).
If the features repository XML changes, you have to indicate to Apache Karaf to refresh the features repository to load the changes.
The feature:repo-refresh
command refreshes the features repository.
Without argument, the command refreshes all features repository:
karaf@root()> feature:repo-refresh Refreshing feature url mvn:org.apache.karaf.features/standard/3.0.0/xml/features Refreshing feature url mvn:org.apache.karaf.features/enterprise/3.0.0/xml/features Refreshing feature url mvn:org.ops4j.pax.web/pax-web-features/3.0.4/xml/features Refreshing feature url mvn:org.apache.karaf.features/spring/3.0.0/xml/features
Instead of refreshing all features repositories, you can specify the features repository to refresh, by providing the URL or the features repository name (and optionally version):
karaf@root()> feature:repo-refresh mvn:org.apache.karaf.features/standard/3.0.0-SNAPSHOT/xml/features Refreshing feature url mvn:org.apache.karaf.features/standard/3.0.0-SNAPSHOT/xml/features
karaf@root()> feature:repo-refresh cellar Refreshing feature url mvn:org.apache.karaf.cellar/apache-karaf-cellar/LATEST/xml/features
feature:repo-remove
The feature:repo-remove
command removes a features repository from the registered ones.
The feature:repo-remove
command requires a argument:
-
the features repository name (as displayed in the repository column of the
feature:repo-list
command output) -
the features repository URL (as displayed in the URL column of the
feature:repo-list
command output)
karaf@root()> feature:repo-remove karaf-cellar-3.0.0
karaf@root()> feature:repo-remove mvn:org.apache.karaf.cellar/apache-karaf-cellar/LATEST/xml/features
By default, the feature:repo-remove
command just removes the features repository from the registered ones: it doesn’t
uninstall the features provided by the features repository.
If you use -u
option, the feature:repo-remove
command uninstalls all features described by the features repository:
karaf@root()> feature:repo-remove -u karaf-cellar-3.0.0
feature:list
The feature:list
command lists all available features (provided by the different registered features repositories):
karaf@root()> feature:list Name | Version | Installed | Repository | Description -------------------------------------------------------------------------------------------------------------------------------------------- standard | 3.0.0 | x | standard-3.0.0 | Karaf standard feature aries-annotation | 3.0.0 | | standard-3.0.0 | Aries Annotations wrapper | 3.0.0 | | standard-3.0.0 | Provide OS integration service-wrapper | 3.0.0 | | standard-3.0.0 | Provide OS integration (alias to wrapper feature) obr | 3.0.0 | | standard-3.0.0 | Provide OSGi Bundle Repository (OBR) support config | 3.0.0 | x | standard-3.0.0 | Provide OSGi ConfigAdmin support region | 3.0.0 | x | standard-3.0.0 | Provide Region Support ...
If you want to order the features by alphabetical name, you can use the -o
option:
karaf@root()> feature:list -o Name | Version | Installed | Repository | Description -------------------------------------------------------------------------------------------------------------------------------------------- aries-annotation | 3.0.0-SNAPSHOT | | standard-3.0.0-SNAPSHOT | Aries Annotations blueprint-web | 3.0.0-SNAPSHOT | | standard-3.0.0-SNAPSHOT | Provides an OSGI-aware Servlet ContextListener for config | 3.0.0-SNAPSHOT | x | standard-3.0.0-SNAPSHOT | Provide OSGi ConfigAdmin support eventadmin | 3.0.0-SNAPSHOT | | standard-3.0.0-SNAPSHOT | OSGi Event Admin service specification for event-b http | 3.0.0-SNAPSHOT | | standard-3.0.0-SNAPSHOT | Implementation of the OSGI HTTP Service http-whiteboard | 3.0.0-SNAPSHOT | | standard-3.0.0-SNAPSHOT | Provide HTTP Whiteboard pattern support ...
By default, the feature:list
command displays all features, whatever their current state (installed or not installed).
Using the -i
option displays only installed features:
karaf@root()> feature:list -i Name | Version | Installed | Repository | Description ---------------------------------------------------------------------------------------------------------------------- standard | 3.0.0 | x | standard-3.0.0 | Karaf standard feature config | 3.0.0 | x | standard-3.0.0 | Provide OSGi ConfigAdmin support region | 3.0.0 | x | standard-3.0.0 | Provide Region Support package | 3.0.0 | x | standard-3.0.0 | Package commands and mbeans kar | 3.0.0 | x | standard-3.0.0 | Provide KAR (KARaf archive) support ssh | 3.0.0 | x | standard-3.0.0 | Provide a SSHd server on Karaf management | 3.0.0 | x | standard-3.0.0 | Provide a JMX MBeanServer and a set of MBeans in K
feature:install
The feature:install
command installs a feature.
It requires the feature
argument. The feature
argument is the name of the feature, or the name/version of the feature.
If only the name of the feature is provided (not the version), the latest version available will be installed.
karaf@root()> feature:install eventadmin
karaf@root()> feature:install eventadmin/3.0.0
By default, the feature:install
command is not verbose. If you want to have some details about actions performed by the feature:install
command, you can use the -v
option:
karaf@root()> feature:install -v eventadmin Installing feature eventadmin 3.0.0 Found installed bundle: org.apache.felix.eventadmin [80]
If a feature contains a bundle which is already installed, by default, Apache Karaf will refresh this bundle.
Sometime, this refresh can cause issue to other running applications. If you want to disable the auto-refresh of installed
bundles, you can use the -r
option:
karaf@root()> feature:install -v -r eventadmin Installing feature eventadmin 3.0.0 Installing bundle mvn:org.apache.felix/org.apache.felix.eventadmin/1.3.2
If the installation of a failure fails (for any reason), by default, Apache Karaf will uninstall all bundles installed by the feature. It will go back in the state before the installation of the feature.
If you want to keep the bundles in the feature successfully installed, you can use the -c
option. Even if the complete feature
installation fails, the feature successfully installed bundles remain installed.
feature:uninstall
The feature:uninstall
command uninstalls a feature. As the feature:install
command, the feature:uninstall
command
requires the feature
argument. The feature
argument is the name of the feature, or the name/version of the feature.
If only the name of the feature is provided (not the version), the latest version available will be installed.
karaf@root()> feature:uninstall eventadmin
4.10.10. Deployer
You can "hot deploy" a features XML by dropping the file directly in the deploy
folder.
Apache Karaf provides a features deployer.
When you drop a features XML in the deploy folder, the features deployer does:
* register the features XML as a features repository
* the features with install
attribute set to "auto" will be automatically installed by the features deployer.
For instance, dropping the following XML in the deploy folder will automatically install feature1 and feature2, whereas feature3 won’t be installed:
<?xml version="1.0" encoding="UTF-8"?> <features name="my-features" xmlns="http://karaf.apache.org/xmlns/features/v1.2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://karaf.apache.org/xmlns/features/v1.2.0 http://karaf.apache.org/xmlns/features/v1.2.0"> <feature name="feature1" version="1.0" install="auto"> ... </feature> <feature name="feature2" version="1.0" install="auto"> ... </feature> <feature name="feature3" version="1.0"> ... </feature> </features>
4.10.11. JMX FeatureMBean
On the JMX layer, you have a MBean dedicated to the management of the features and features repositories: the FeatureMBean.
The FeatureMBean object name is: org.apache.karaf:type=feature,name=*
.
Attributes
The FeatureMBean provides two attributes:
-
Features
is a tabular data set of all features available. -
Repositories
is a tabular data set of all registered features repositories.
The Repositories
attribute provides the following information:
-
Name
is the name of the features repository. -
Uri
is the URI to the features XML for this repository. -
Features
is a tabular data set of all features (name and version) provided by this features repository. -
Repositories
is a tabular data set of features repositories "imported" in this features repository.
The Features
attribute provides the following information:
-
Name
is the name of the feature. -
Version
is the version of the feature. -
Installed
is a boolean. If true, it means that the feature is currently installed. -
Bundles
is a tabular data set of all bundles (bundles URL) described in the feature. -
Configurations
is a tabular data set of all configurations described in the feature. -
Configuration Files
is a tabular data set of all configuration files described in the feature. -
Dependencies
is a tabular data set of all dependent features described in the feature.
Operations
-
addRepository(url)
adds the features repository with theurl
. Theurl
can be aname
as in thefeature:repo-add
command. -
addRepository(url, install)
adds the features repository with theurl
and automatically installs all bundles ifinstall
is true. Theurl
can be aname
like in thefeature:repo-add
command. -
removeRepository(url)
removes the features repository with theurl
. Theurl
can be aname
as in thefeature:repo-remove
command. -
installFeature(name)
installs the feature with thename
. -
installFeature(name, version)
installs the feature with thename
andversion
. -
installFeature(name, noClean, noRefresh)
installs the feature with thename
without cleaning the bundles in case of failure, and without refreshing already installed bundles. -
installFeature(name, version, noClean, noRefresh) ` installs the feature with the `name
andversion
without cleaning the bundles in case of failure, and without refreshing already installed bundles. -
uninstallFeature(name)
uninstalls the feature with thename
. -
uninstallFeature(name, version)
uninstalls the feature with thename
andversion
.
Notifications
The FeatureMBean sends two kind of notifications (on which you can subscribe and react):
-
When a feature repository changes (added or removed).
-
When a feature changes (installed or uninstalled).
4.11. Deployers
The following picture describes the architecture of the deployers.
Apache Karaf polls the deploy
folder for new files.
You can configure the location of the deploy
folder, and the polling behaviour in the etc/org.apache.felix.fileinstall-deploy.cfg
configuration file:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ felix.fileinstall.dir = ${karaf.base}/deploy felix.fileinstall.tmpdir = ${karaf.data}/generated-bundles felix.fileinstall.poll = 1000 felix.fileinstall.start.level = 80 felix.fileinstall.active.level = 80
-
felix.fileinstall.dir
defines the location of thedeploy
folder. Default value isKARAF_BASE/deploy
. -
felix.fileinstall.tmpdir
defines a temporary folder where the deployers store their files. Default value isKARAF_DATA/generated-bundles
. -
felix.fileinstall.poll
defines the polling interval (in milliseconds). Default value is 1 second.
When Apache Karaf polls a file from the deploy
folder, it "delegates" the file handling to a deployer.
By default, Apache Karaf provides a set of deployers:
-
Blueprint deployer is able to handle Blueprint XML files.
-
Spring deployer is able to handle Spring XML files.
-
Features deployer is able to handle Apache Karaf features XML files (see [Provisioning section|provisioning] for details).
-
KAR deployer is able to handle KAR files (see [KAR section|kar] for details).
-
Wrap deployer is able to handle non-OSGi jar files and turns it as OSGi bundles "on the fly".
-
Optionally, WAR deployer (if you install the war feature) is able to handle WAR files.
4.11.1. Blueprint deployer
The Blueprint deployer is able to handle plain Blueprint XML configuration files.
The Blueprint deployer is able to transform "on the fly" any Blueprint XML file into valid OSGi bundle.
The generated OSGi MANIFEST will contain the following headers:
Manifest-Version: 2 Bundle-SymbolicName: [name of the file] Bundle-Version: [version of the file] Import-Package: [required packages] DynamicImport-Package: *
The name
and version
of the file are extracted using a heuristic that will match common patterns.
For example my-config-1.0.1.xml
will lead to name = my-config
and version = 1.0.1
.
The default imported packages are extracted from the spring file definition and includes all classes referenced directly.
If you need to customize the generated manifest, you can do so by including an xml element in your blueprint configuration:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <manifest xmlns="http://karaf.apache.org/xmlns/deployer/blueprint/v1.0.0"> Require-Bundle= my-bundle </manifest>
4.11.2. Spring deployer
The Spring deployer is similar to the Blueprint deployer.
The Spring deployer is able to deploy Spring XML files.
Like the Blueprint deployer, the generated OSGi MANIFEST will contain the following headers:
Manifest-Version: 2 Bundle-SymbolicName: [name of the file] Bundle-Version: [version of the file] Spring-Context: *;publish-context:=false;create-asynchronously:=true Import-Package: [required packages] DynamicImport-Package: *
If you need to customize the generated manifest, you can do so by including a XML element in your Spring configuration:
<spring:beans ...> <manifest xmlns="http://karaf.apache.org/xmlns/deployer/spring/v1.0.0"> Require-Bundle= my-bundle </manifest>
4.11.3. Features deployer
See the Provisioning section for details.
4.11.4. KAR deployer
See the KAR section for details.
4.11.5. War deployer
The installation of the WAR feature enables a WAR deployer.
It means that with the war feature installed, Apache Karaf is a complete OSGi WebContainer (like Tomcat) where you can deploy WAB (WebApplication Bundle) or pure WAR (WebApplication aRchive).
You can install the war feature with:
karaf@root()> feature:install -v war Installing feature war 3.0.0 Installing feature pax-war 3.0.5 Installing feature pax-http-whiteboard 3.0.5 Installing feature pax-http 3.0.5 Installing feature pax-jetty 8.1.14.v20131031 Found installed bundle: org.apache.servicemix.specs.activation-api-1.1 [81] Found installed bundle: org.apache.geronimo.specs.geronimo-servlet_3.0_spec [82] Found installed bundle: javax.mail [83] Found installed bundle: org.apache.geronimo.specs.geronimo-jta_1.1_spec [84] Found installed bundle: org.apache.geronimo.specs.geronimo-annotation_1.1_spec [85] Found installed bundle: org.apache.geronimo.specs.geronimo-jaspic_1.0_spec [86] Found installed bundle: org.apache.servicemix.bundles.asm [87] Found installed bundle: org.eclipse.jetty.aggregate.jetty-all-server [88] Checking configuration file mvn:org.ops4j.pax.web/pax-web-features/3.0.5/xml/jettyconfig Installing bundle mvn:org.ops4j.base/ops4j-base-lang/1.4.0 Found installed bundle: org.ops4j.pax.swissbox.core [89] Found installed bundle: org.ops4j.pax.swissbox.optional.jcl [90] Found installed bundle: org.apache.xbean.bundleutils [91] Found installed bundle: org.apache.xbean.asm-shaded [92] Found installed bundle: org.apache.xbean.reflect [93] Found installed bundle: org.apache.xbean.finder-shaded [94] Found installed bundle: org.ops4j.pax.web.pax-web-api [95] Found installed bundle: org.ops4j.pax.web.pax-web-spi [96] Found installed bundle: org.ops4j.pax.web.pax-web-runtime [97] Found installed bundle: org.ops4j.pax.web.pax-web-jetty [98] Found installed bundle: org.ops4j.pax.web.pax-web-jsp [99] Found installed bundle: org.ops4j.pax.web.pax-web-extender-whiteboard [100] Installing bundle mvn:org.ops4j.pax.web/pax-web-jsp/3.0.5 Found installed bundle: org.ops4j.pax.web.pax-web-extender-war [101] Installing bundle mvn:org.ops4j.pax.web/pax-web-extender-whiteboard/3.0.5 Found installed bundle: org.ops4j.pax.web.pax-web-deployer [102] Found installed bundle: org.ops4j.pax.url.war [103] Found installed bundle: org.ops4j.pax.url.commons [104] Found installed bundle: org.ops4j.pax.swissbox.pax-swissbox-bnd [105] Found installed bundle: org.ops4j.pax.swissbox.property [106] Installing bundle mvn:org.ops4j.base/ops4j-base-net/1.4.0 Installing bundle mvn:org.ops4j.base/ops4j-base-lang/1.4.0 Installing bundle mvn:org.ops4j.base/ops4j-base-monitors/1.4.0 Installing bundle mvn:org.ops4j.base/ops4j-base-util-property/1.4.0 Found installed bundle: biz.aQute.bndlib [107] Found installed bundle: org.apache.karaf.web.core [108] Found installed bundle: org.apache.karaf.web.command [109]
We can note that the Pax Web deployer (WAR deployer) has been started:
... Found installed bundle: org.ops4j.pax.web.pax-web-deployer [102] ...
The WAR deployer supports:
-
WAB files
-
WAR files
-
exploded WAR (as a directory named
*.war
).
The only requirement of the WAR deployer is that the archive contains the WEB-INF/web.xml
file.
4.11.6. Wrap deployer
The wrap deployer allows you to "hot deploy" non-OSGi jar files ("classical" jar files) from the deploy folder.
The wrap deployer creates "on the fly" an OSGi bundle with a non-OSGi jar file.
The wrap deployer looks for jar files in the deploy folder. A jar file is considered as non-OSGi if the MANIFEST doesn’t
contain the Bundle-SymbolicName
and Bundle-Version
attributes, or if there is no MANIFEST at all.
The wrap deployer "transforms" non-OSGi jar file into an OSGi bundle.
The wrap deployer tries to populate the Bundle-SymbolicName and Bundle-Version extracted from the jar file path.
For example, if you simply copy commons-lang-2.3.jar (which is not an OSGi bundle) into the deploy folder, you will see:
karaf@root()> la|grep -i commons-lang 80 | Active | 80 | 2.3 | commons-lang
If you take a look on the commons-lang headers, you can see that the bundle exports all packages with optional resolution
and that Bundle-SymbolicName
and Bundle-Version
have been populated:
karaf@root()> bundle:headers 80 commons-lang (80) ----------------- Specification-Title = Commons Lang Tool = Bnd-2.1.0.20130426-122213 Specification-Version = 2.3 Specification-Vendor = Apache Software Foundation Implementation-Version = 2.3 Generated-By-Ops4j-Pax-From = wrap:file:/opt/apache-karaf-3.0.0/deploy/commons-lang-2.3.jar$Bundle-SymbolicName=commons-lang&Bundle-Version=2.3 Implementation-Vendor-Id = org.apache Created-By = 1.7.0_21 (Oracle Corporation) Implementation-Title = Commons Lang Manifest-Version = 1.0 Bnd-LastModified = 1386339925753 X-Compile-Target-JDK = 1.1 Originally-Created-By = 1.3.1_09-85 ("Apple Computer, Inc.") Ant-Version = Apache Ant 1.6.5 Package = org.apache.commons.lang X-Compile-Source-JDK = 1.3 Extension-Name = commons-lang Implementation-Vendor = Apache Software Foundation Bundle-Name = commons-lang Bundle-SymbolicName = commons-lang Bundle-Version = 2.3 Bundle-ManifestVersion = 2 Export-Package = org.apache.commons.lang;uses:=org.apache.commons.lang.exception, org.apache.commons.lang.builder, org.apache.commons.lang.enum, org.apache.commons.lang.enums, org.apache.commons.lang.exception, org.apache.commons.lang.math, org.apache.commons.lang.mutable, org.apache.commons.lang.text, org.apache.commons.lang.time, org, org.apache, org.apache.commons
You can specify some MANIFEST headers by specifying the headers as URL parameters.
In the URL parameters, you can specify the headers using the $ character and & to separate the different headers. For instance:
karaf@root()> bundle:install -s 'wrap:mvn:jboss/jbossall-client/4.2.3.GA/$Bundle-SymbolicName=jbossall-client&Bundle-Version=4.2.3.GA&Export-Package=org.jboss.remoting;version="4.2.3.GA",\!*'
When defined in a features.xml file, it’s necessary to escape any ampersands and quotes, or use a CDATA tag:
<bundle>wrap:mvn:jboss/jbossall-client/4.3.2.GA/$Bundle-SymbolicName=jbossall-client&Bundle-Version=4.3.2.GA&Export-Package=org.jboss.remoting;version="4.3.2.GA",!*</bundle>
4.12. KAR
As described in the Provisioning section, Apache Karaf features describe applications.
A feature defines different resources to resolve using URL (for instance, bundles URLs, or configuration files URLs). As described in the [Artifacts repositories and URLs section|urls], Apache Karaf looks for artifacts (bundles, configuration files, …) in the artifact repositories. Apache Karaf may require to download artifacts from remote repositories.
Apache Karaf provides a special type of artifact that package a features XML and all resources described in the features of this XML. This artifact is named a KAR (KAraf aRchive).
A KAR file is a zip archive containing the
Basically, the kar format is a jar (so a zip file) which contains a set of feature descriptor and bundle jar files.
A KAR file contains a repository
folder containing:
-
a set of features XML files
-
the artifacts following the Maven directory structure (
groupId/artifactId/version/artifactId-version.type
).
For instance, the spring-3.0.0.kar
contains:
~$ unzip -l spring-3.0.0.kar Archive: spring-3.0.0.kar Length Date Time Name --------- ---------- ----- ---- 143 2013-12-06 10:52 META-INF/MANIFEST.MF 12186 2013-12-06 10:52 repository/org/apache/karaf/features/spring/3.0.0/spring-3.0.0-features.xml 575389 2013-12-06 10:52 repository/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar 232019 2013-12-06 10:52 repository/commons-beanutils/commons-beanutils/1.8.3/commons-beanutils-1.8.3.jar 673109 2013-12-06 10:52 repository/org/apache/servicemix/bundles/org.apache.servicemix.bundles.struts/1.3.10_1/org.apache.servicemix.bundles.struts-1.3.10_1.jar 37084 2013-12-06 10:52 repository/org/springframework/org.springframework.web.struts/3.2.4.RELEASE/org.springframework.web.struts-3.2.4.RELEASE.jar 7411 2013-12-06 10:52 repository/org/springframework/org.springframework.instrument/3.2.4.RELEASE/org.springframework.instrument-3.2.4.RELEASE.jar 246881 2013-12-06 10:52 repository/org/springframework/org.springframework.transaction/3.2.4.RELEASE/org.springframework.transaction-3.2.4.RELEASE.jar 16513 2013-12-06 10:52 repository/org/apache/servicemix/bundles/org.apache.servicemix.bundles.aopalliance/1.0_6/org.apache.servicemix.bundles.aopalliance-1.0_6.jar 881124 2013-12-06 10:52 repository/org/springframework/org.springframework.core/3.2.4.RELEASE/org.springframework.core-3.2.4.RELEASE.jar 199240 2013-12-06 10:52 repository/org/springframework/org.springframework.expression/3.2.4.RELEASE/org.springframework.expression-3.2.4.RELEASE.jar 614646 2013-12-06 10:52 repository/org/springframework/org.springframework.beans/3.2.4.RELEASE/org.springframework.beans-3.2.4.RELEASE.jar 340841 2013-12-06 10:52 repository/org/springframework/org.springframework.aop/3.2.4.RELEASE/org.springframework.aop-3.2.4.RELEASE.jar 877369 2013-12-06 10:52 repository/org/springframework/org.springframework.context/3.2.4.RELEASE/org.springframework.context-3.2.4.RELEASE.jar 130224 2013-12-06 10:52 repository/org/springframework/org.springframework.context.support/3.2.4.RELEASE/org.springframework.context.support-3.2.4.RELEASE.jar 30640 2013-12-06 10:52 repository/org/apache/karaf/deployer/org.apache.karaf.deployer.spring/3.0.0/org.apache.karaf.deployer.spring-3.0.0.jar 51951 2013-12-06 10:52 repository/org/springframework/org.springframework.aspects/3.2.4.RELEASE/org.springframework.aspects-3.2.4.RELEASE.jar 411175 2013-12-06 10:52 repository/org/springframework/org.springframework.jdbc/3.2.4.RELEASE/org.springframework.jdbc-3.2.4.RELEASE.jar 48049 2013-12-06 10:52 repository/javax/portlet/portlet-api/2.0/portlet-api-2.0.jar 190883 2013-12-06 10:52 repository/org/springframework/org.springframework.web.portlet/3.2.4.RELEASE/org.springframework.web.portlet-3.2.4.RELEASE.jar 635680 2013-12-06 10:52 repository/org/springframework/org.springframework.web/3.2.4.RELEASE/org.springframework.web-3.2.4.RELEASE.jar 645946 2013-12-06 10:52 repository/org/springframework/org.springframework.web.servlet/3.2.4.RELEASE/org.springframework.web.servlet-3.2.4.RELEASE.jar 464911 2013-12-06 10:52 repository/org/springframework/org.springframework.test/3.2.4.RELEASE/org.springframework.test-3.2.4.RELEASE.jar 69784 2013-12-06 10:52 repository/org/springframework/osgi/spring-osgi-web/1.2.1/spring-osgi-web-1.2.1.jar 16030 2013-12-06 10:52 repository/org/apache/geronimo/specs/geronimo-jta_1.1_spec/1.1.1/geronimo-jta_1.1_spec-1.1.1.jar 32359 2013-12-06 10:52 repository/org/apache/geronimo/specs/geronimo-jms_1.1_spec/1.1.1/geronimo-jms_1.1_spec-1.1.1.jar 208684 2013-12-06 10:52 repository/org/springframework/org.springframework.jms/3.2.4.RELEASE/org.springframework.jms-3.2.4.RELEASE.jar 75672 2013-12-06 10:52 repository/org/springframework/org.springframework.oxm/3.2.4.RELEASE/org.springframework.oxm-3.2.4.RELEASE.jar 393607 2013-12-06 10:52 repository/org/springframework/org.springframework.orm/3.2.4.RELEASE/org.springframework.orm-3.2.4.RELEASE.jar 338559 2013-12-06 10:52 repository/org/apache/servicemix/bundles/org.apache.servicemix.bundles.cglib/3.0_1/org.apache.servicemix.bundles.cglib-3.0_1.jar 35859 2013-12-06 10:52 repository/org/springframework/osgi/spring-osgi-io/1.2.1/spring-osgi-io-1.2.1.jar 362889 2013-12-06 10:52 repository/org/springframework/osgi/spring-osgi-core/1.2.1/spring-osgi-core-1.2.1.jar 120822 2013-12-06 10:52 repository/org/springframework/osgi/spring-osgi-extender/1.2.1/spring-osgi-extender-1.2.1.jar 24231 2013-12-06 10:52 repository/org/springframework/osgi/spring-osgi-annotation/1.2.1/spring-osgi-annotation-1.2.1.jar 12597 2013-12-06 10:52 repository/org/apache/karaf/bundle/org.apache.karaf.bundle.springstate/3.0.0/org.apache.karaf.bundle.springstate-3.0.0.jar 31903 2013-12-06 10:52 repository/org/eclipse/gemini/blueprint/gemini-blueprint-io/1.0.0.RELEASE/gemini-blueprint-io-1.0.0.RELEASE.jar 578205 2013-12-06 10:52 repository/org/eclipse/gemini/blueprint/gemini-blueprint-core/1.0.0.RELEASE/gemini-blueprint-core-1.0.0.RELEASE.jar 178525 2013-12-06 10:52 repository/org/eclipse/gemini/blueprint/gemini-blueprint-extender/1.0.0.RELEASE/gemini-blueprint-extender-1.0.0.RELEASE.jar --------- ------- 9803140 38 files
As a KAR file is a simple zip file, you can create the KAR file by hand.
For instance, the following Unix commands create a very simple KAR file:
~$ mkdir repository ~$ cp /path/to/features.xml repository/features.xml ~$ cp /path/to/my.jar repository/my/project/my/1.0.0/my-1.0.0.jar ~$ zip -r my.kar repository updating: repository/ (stored 0%) adding: repository/my/project/my/1.0.0/my-1.0.0.jar (deflated 0%)
You can create KAR files using Apache Maven, or directly in the Apache Karaf console.
4.12.1. Maven
Apache Karaf provides a Maven plugin: karaf-maven-plugin
.
The Apache Karaf Maven plugin provides the features-create-kar
goal.
The features-create-kar
goal does:
-
Reads all features specified in the features XML.
-
For each feature described in the features XML, the goal resolves the bundles described in the feature.
-
The goal finally packages the features XML, and the resolved bundles in a zip file.
You can also use the Karaf maven plugin. The features maven plugin provides an features-create-kar goal.
The features-create-kar goal:
-
Reads all features specified in the features descriptor.
-
For each feature, it resolves the bundles defined in the feature.
-
All bundles are packaged into the kar archive.
For instance, the following Maven POM create my-kar.kar
For instance, you can use the following POM to create a kar:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>my.groupId</groupId> <artifactId>my-kar</artifactId> <version>1.0</version> <packaging>pom</packaging> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>3.0.0</version> <executions> <execution> <id>features-create-kar</id> <goals> <goal>features-create-kar</goal> </goals> <configuration> <featuresFile>src/main/resources/features.xml</featuresFile> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
To create the KAR file, simply type:
~$ mvn install
Uou will have your kar in the target
directory.
4.12.2. Commands
Apache Karaf provides kar:*
commands to manage KAR archives.
kar:list
The kar:list
command lists the installed KAR archives.
karaf@root()> kar:list KAR Name ------------------- my-kar-1.0-SNAPSHOT
A KAR is identified by its name.
kar:create
Instead of using the karaf-maven-plugin
or create the KAR archive by hand, you can use the kar:create
command.
The kar:create
command creates a KAR file using a registered features repository.
For instance, you want to create a KAR file for the Pax Web repository.
The feature:repo-list
command gives you the list of registered features repositories:
karaf@root()> feature:repo-list Repository | URL ------------------------------------------------------------------------------------------------------- standard-3.0.0 | mvn:org.apache.karaf.features/standard/3.0.0/xml/features enterprise-3.0.0 | mvn:org.apache.karaf.features/enterprise/3.0.0/xml/features spring-3.0.0 | mvn:org.apache.karaf.features/spring/3.0.0/xml/features org.ops4j.pax.web-3.0.5 | mvn:org.ops4j.pax.web/pax-web-features/3.0.5/xml/features
You can use one of these features repositories to create the kar file:
karaf@root()> kar:create org.ops4j.pax.web-3.0.5 Adding feature pax-war Adding feature pax-http-whiteboard Adding feature pax-jetty Adding feature pax-tomcat Adding feature pax-http Kar file created : /opt/apache-karaf-3.0.0/data/kar/org.ops4j.pax.web-3.0.5.kar
You can see that the KAR file has been created in the KARAF_DATA/kar
folder.
By default, the kar:create
command creates a KAR file, packaging all features in the features descriptor.
You can provide the list of features that you want to package into the KAR file:
karaf@root()> kar:create org.ops4j.pax.web-3.0.5 pax-jetty pax-tomcat Adding feature pax-jetty Adding feature pax-tomcat Kar file created : /opt/apache-karaf-3.0.0/data/kar/org.ops4j.pax.web-3.0.5.kar
kar:install
You can deploy a KAR file using kar:install
command.
The kar:install
command expects the KAR URL. Any URL described in the [Artifacts repositories and URLs section|urls]
is supported by the kar:install
command:
karaf@root()> kar:install file:/tmp/my-kar-1.0-SNAPSHOT.kar
The KAR file is uncompressed and populated the KARAF_BASE/system
folder.
The Apache Karaf KAR service is looking for features XML files in the KAR file, registers the features XML and automatically installs all features described in the features repositories present in the KAR file.
kar:uninstall
The kar:uninstall
command uninstall a KAR file (identified by a name).
By uninstall, it means that:
-
the features previously installed by the KAR file are uninstalled
-
delete (from the
KARAF_DATA/system
repository) all files previously "populated" by the KAR file
For instance, to uninstall the previously installed my-kar-1.0-SNAPSHOT.kar
KAR file:
karaf@root()> kar:uninstall my-kar-1.0-SNAPSHOT
4.12.3. Deployer
Apache Karaf also provides a KAR deployer. It means that you can drop a KAR file directly in the deploy
folder.
Apache Karaf will automatically install KAR files from the deploy
folder.
You can change the behaviours of the KAR deployer in the etc/org.apache.karaf.kar.cfg
:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # Enable or disable the refresh of the bundles when installing # the features contained in a KAR file # noAutoRefreshBundles=false
By default, when the KAR deployer install features, by default, it refresh the bundles already installed.
You can disable the automatic bundles refresh by setting the noAutoRefreshBundles
property to false
.
4.12.4. JMX KarMBean
On the JMX layer, you have a MBean dedicated to the management of the KAR files.
The ObjectName to use is org.apache.karaf:type=kar,name=*
.
Attributes
The Kars
attributes provides the list of KAR files (name) installed.
Operations
-
install(url)
installs the KAR file at the givenurl
. -
create(repository, features)
creates a KAR file using the given featuresrepository
name, and optionally the list offeatures
to include in the KAR file. -
uninstall(name)
uninstalls a KAR file with the givenname
.
4.13. Instances
A instance is a complete new Apache Karaf runtime, isolated from the other ones.
The purpose is to easily create and manage a new Apache Karaf runtime without installing a complete distribution.
A instance is a new instance that you can launch separately from the root one, and deploy applications into. It means that each instance is run on a different JVM.
A instance does not contain a full copy of the Apache Karaf distribution, but only a set of the configuration files and data folder which contains all the runtime information, logs and temporary files.
4.13.1. Using the instance commands
The instance commands allow you to create and manage instances.
Creating instances
You create a new runtime instance by typing instance:create
in the Karaf console.
As shown in the following example, instance:create
causes the runtime to create a new runtime installation in the active runtime’s `instances/[name] directory.
The new instance is a new Karaf instance and is assigned an SSH port number based on an incremental count starting at 8101 and a
RMI registry port number based on an incremental count starting at 1099.
karaf@root()> instance:create test
The new instance is fresh Apache Karaf instance. It uses default configuration files set, as you install a fresh Karaf distribution.
You can enable the verbose mode for the instance:create
command using the -v
option:
karaf@root()> instance:create -v test Creating new instance on SSH port 8103 and registry port 1101 / RMI server port 44446 at: /opt/karaf/instances/test Creating dir: /opt/karaf/instances/test/bin Creating dir: /opt/karaf/instances/test/etc Creating dir: /opt/karaf/instances/test/system Creating dir: /opt/karaf/instances/test/deploy Creating dir: /opt/karaf/instances/test/data Creating file: /opt/karaf/instances/test/etc/config.properties Creating file: /opt/karaf/instances/test/etc/jre.properties Creating file: /opt/karaf/instances/test/etc/custom.properties Creating file: /opt/karaf/instances/test/etc/java.util.logging.properties Creating file: /opt/karaf/instances/test/etc/org.apache.felix.fileinstall-deploy.cfg Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.features.obr.cfg Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.features.repos.cfg Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.log.cfg Creating file: /opt/karaf/instances/test/etc/org.ops4j.pax.logging.cfg Creating file: /opt/karaf/instances/test/etc/org.ops4j.pax.url.mvn.cfg Creating file: /opt/karaf/instances/test/etc/users.properties Creating file: /opt/karaf/instances/test/etc/keys.properties Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.features.cfg Creating file: /opt/karaf/instances/test/etc/system.properties Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.shell.cfg Creating file: /opt/karaf/instances/test/etc/org.apache.karaf.management.cfg Creating file: /opt/karaf/instances/test/bin/karaf Creating file: /opt/karaf/instances/test/bin/start Creating file: /opt/karaf/instances/test/bin/stop
You can manually configure the different ports, the location of the instance, the Apache Karaf features URLs using different options of the instance:create
command.
You can have details about these options using the --help
option.
Cloning an instance
Instead of creating a fresh instance, you can clone an existing instance using instance:clone
.
The instance:clone
command reuse the files from the source instance:
karaf@root()> instance:clone root test
You can have details about the cloning options using the --help
option.
Changing the instance location
By default, the new instances storage is in the KARAF_HOME/instance
directory.
You find a directory with the name of the instance storing the different instance files.
You can change the location of the instance using the -l
option to the instance:create
and instance:clone
commands:
karaf@root()> instance:create -v -l /tmp/test test Creating new instance on SSH port 8102 and registry port 1100 / RMI server port 44445 at: /tmp/test Creating dir: /tmp/test/bin Creating dir: /tmp/test/etc Creating dir: /tmp/test/system Creating dir: /tmp/test/deploy Creating dir: /tmp/test/data Creating file: /tmp/test/etc/config.properties Creating file: /tmp/test/etc/jre.properties Creating file: /tmp/test/etc/custom.properties Creating file: /tmp/test/etc/java.util.logging.properties Creating file: /tmp/test/etc/org.apache.felix.fileinstall-deploy.cfg Creating file: /tmp/test/etc/org.apache.karaf.features.obr.cfg Creating file: /tmp/test/etc/org.apache.karaf.features.repos.cfg Creating file: /tmp/test/etc/org.apache.karaf.log.cfg Creating file: /tmp/test/etc/org.ops4j.pax.logging.cfg Creating file: /tmp/test/etc/org.ops4j.pax.url.mvn.cfg Creating file: /tmp/test/etc/users.properties Creating file: /tmp/test/etc/keys.properties Creating file: /tmp/test/etc/org.apache.karaf.features.cfg Creating file: /tmp/test/etc/system.properties Creating file: /tmp/test/etc/org.apache.karaf.shell.cfg Creating file: /tmp/test/etc/org.apache.karaf.management.cfg Creating file: /tmp/test/bin/karaf Creating file: /tmp/test/bin/start Creating file: /tmp/test/bin/stop
Careful, it’s not possible to change the location of an instance once it has been created.
Note
|
|
Changing instance ports
You can change the SSH port number assigned to an instance using the instance:ssh-port-change
command:
karaf@root()> instance:ssh-port-change test 8104
where test is the instance name and 8104 is the new SSH port number to use for the test instance.
You can change the RMI Registry port number (used by JMX) of an instance using the instance:rmi-registry-port-change
command:
karaf@root()> instance:rmi-registry-port-change test 1102
where test is the instance name and 1102 is the new RMI Registry port number to use for the test instance.
You can also change the RMI Server port number (used by JMX too) of an instance using the instance:rmi-server-port-change
command:
karaf@root()> instance:rmi-server-port-change test 44447
where test is the instance name and 44447 is the new RMI Server port number to use for the test instance.
Note
|
The instance has to be stopped to be able to change the port numbers. |
Starting instances
New instances are created in a stopped state.
To start an instance, you can use the instance:start
command:
karaf@root()> instance:start test
where test is the instance name.
Listing instances
To list the instances and their current status, you can use the instance:list
command:
karaf@root()> instance:list SSH Port | RMI Registry | RMI Server | State | PID | Name ------------------------------------------------------------- 8101 | 1099 | 44444 | Started | 19652 | root 8104 | 1101 | 44446 | Stopped | 0 | test
An instance can be in the following status:
-
Stopped: the instance is stopped.
-
Starting: the instance is starting.
-
Started: the instance is up and running. You can connect and use it.
Status of an instance
You can get directly the status of a given instance using the instance:status
command:
karaf@root()> instance:status test Started
where test is the instance name.
Connecting to an instance
You can connect to a running instance directly from the root one using the instance:connect
command:
karaf@root()> instance:connect test
where test is the instance name where to connect to.
By default, this command will use the same username used on the root instance, and the password will be prompted.
You can use a different username using the -u
or --username
option. You can also provide the password using the
-p
or --password
option.
If you don’t provide any argument, you will logon on the instance:
karaf@test()>
Note the name of instance in the shell prompt (@test).
You can logoff from the instance and return back to the root instance using the logout
command or CTRL-D key binding:
karaf@test()> logout karaf@root()>
The instance:connect
command accepts shell commands as argument. It allows you to directly execute commands or scripts on the instance:
karaf@root()> instance:connect test feature:list Name | Version | Installed | Repository | Description --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- standard | 3.0.0 | x | standard-3.0.0 | Karaf standard feature aries-annotation | 3.0.0 | | standard-3.0.0 | Aries Annotations wrapper | 3.0.0 | | standard-3.0.0 | Provide OS integration service-wrapper | 3.0.0 | | standard-3.0.0 | Provide OS integration (alias to wrapper feature) obr | 3.0.0 | | standard-3.0.0 | Provide OSGi Bundle Repository (OBR) support config | 3.0.0 | x | standard-3.0.0 | Provide OSGi ConfigAdmin support region | 3.0.0 | x | standard-3.0.0 | Provide Region Support ...
Stop an instance
To stop an instance, you can connect to the instance (using instance:connect
) and execute the system:shutdown
command.
You can also use the [instance:stop
|/commands/instance-stop] command:
karaf@root()> instance:stop test
where test is the instance name.
The instance will go to the "Stopped" state.
Destroy an instance
You can completely delete a stopped instance using the instance:destroy
command:
karaf@root()> instance:destroy test
where test is the instance name.
Note
|
The |
Rename an instance
You can change the name of a stopped instance using the instance:rename
command:
karaf@root()> instance:rename test newTest
where test is the current instance name, and newTest the new instance name.
4.13.2. Instance script
The instance:*
commands require the root instance running.
But, you can also administrate directly instances without the root instance, using the bin/instance
Unix script
(or bin/instance.bat
script on Windows).
You find the same actions that you can do with the instance:*
commands in the instance[.bat]
script:
bin/instance Available commands: clone - Clones an existing container instance. create - Creates a new container instance. destroy - Destroys an existing container instance. list - Lists all existing container instances. opts-change - Changes the Java options of an existing container instance. rename - Rename an existing container instance. rmi-registry-port-change - Changes the RMI registry port (used by management layer) of an existing container instance. rmi-server-port-change - Changes the RMI server port (used by management layer) of an existing instance. ssh-port-change - Changes the secure shell port of an existing container instance. start - Start an existing container instance. status - Check the current status of an instance. stop - Stop an existing container instance. Type 'command --help' for more help on the specified command.
For instance, to list all the instances, you can use the instance
script with the list
command:
bin/instance list SSH Port | RMI Registry | RMI Server | State | PID | Name ----------------------------------------------------------- 8101 | 1099 | 44444 | Stopped | 0 | root 8102 | 1100 | 44445 | Stopped | 0 | test
It’s exactly the same as executing instance:list
in the root instance.
You can obtain details about commands options and arguments using the --help
option. For instance:
bin/instance rename --help DESCRIPTION instance:rename Rename an existing container instance. SYNTAX instance:rename [options] name new-name ARGUMENTS name The name of the container instance to rename new-name The new name of the container instance OPTIONS --help Display this help message -v, --verbose Display actions performed by the command (disabled by default)
4.13.3. JMX InstanceMBean
On the JMX layer, you have a MBean dedicated to the management of the instances: the InstanceMBean.
The ObjectName to use is org.apache.karaf:type=instance,name=*
.
Attributes
The Instances
attribute is a tabular data attribute providing details about the instances:
-
Is Root
(boolean): if true, the instance is the root instance, false else. -
JavaOpts
(string): it contains the JVM arguments used by the instance. -
Location
(string): it’s the path to the instance storage. -
Name
(string): it’s the name of the instance. -
Pid
(long): it’s the current system process ID (PID) of the instance process. -
RMI Registry Port
(int): it’s the port number of the instance RMI Registry (JMX). -
RMI Server Port
(int): it’s the port number of the instance RMI Server (JMX). -
SSH Port
(int): it’s the port number of the instance SSH Server. -
State
(string): it’s the current status of the instance (Stopped, Starting, Started).
Operations
The InstanceMBean provides the following operations, corresponding to the previous instance:*
commands:
* createInstance(instanceName, sshPort, rmiRegistryPort, rmiServerPort, location, javaOpts, features, featuresUrls)
: create a new instance.
* changeSshPort(instanceName, port)
: change the SSH port of an instance.
* changeRmiServerPort(instanceName, port)
: change the RMI server port of an instance.
* changeRmiRegistry(instanceName, port)
: change the RMI registry port of an instance.
* changeJavaOpts(instanceName, javaOpts)
: change the Java options of an instance.
* destroyInstance(instanceName)
: destroy an instance.
* startInstance(instanceName)
: start an instance.
* startInstance(instanceName, options)
: start an instance with the given Java options.
* startInstance(instanceName, options, wait, debug)
: start an instance with the given Java options.
If wait is true, this operation is waiting for the instance is in "Started" state. If debug is true, the instance is started in debug mode.
* stopInstance(instanceName)
: stop an instance.
* renameInstance(instanceName, newInstanceName)
: rename an instance.
* renameInstance(instanceName, newInstanceName, verbose)
: rename an instance. If verbose is true, this operation provides details in the log.
* cloneInstance(instanceName, cloneName, sshPort, rmiRegistryPort, rmiServerPort, location, javaOpts)
: clone an existing instance.
4.14. Security
Apache Karaf provides an advanced and flexible security system, powered by JAAS (Java Authentication and Authorization Service) in an OSGi compliant way.
It provides a dynamic security system.
The Apache Karaf security framework is used internally to control the access to:
-
the OSGi services (described in the developer guide)
-
the console commands
-
the JMX layer
-
the WebConsole
Your applications can also use the security framework (see the developer guide for details).
4.14.1. Realms
Apache Karaf is able to manage multiple realms. A realm contains the definition of the login modules to use for the authentication and/or authorization on this realm. The login modules define the authentication and authorization for the realm.
The jaas:realm-list
command list the current defined realms:
karaf@root()> jaas:realm-list Index | Realm Name | Login Module Class Name ----------------------------------------------------------------------------------- 1 | karaf | org.apache.karaf.jaas.modules.properties.PropertiesLoginModule 2 | karaf | org.apache.karaf.jaas.modules.publickey.PublickeyLoginModule
You can see that the Apache Karaf provides a default realm named karaf
.
This realm has two login modules:
-
the
PropertiesLoginModule
uses theetc/users.properties
file as backend for users, groups, roles and password. This login module authenticates the users and returns the users' roles. -
the
PublickeyLoginModule
is especially used by the SSHd. It uses theetc/keys.properties
file. This file contains the users and a public key associated to each user.
Apache Karaf provides additional login modules (see the developer guide for details):
-
JDBCLoginModule uses a database as backend
-
LDAPLoginModule uses a LDAP server as backend
-
SyncopeLoginModule uses Apache Syncope as backend
-
OsgiConfigLoginModule uses a configuration as backend
You can manage an existing realm, login module, or create your own realm using the jaas:realm-manage
command.
4.14.2. Users, groups, roles, and passwords
As we saw, by default, Apache Karaf uses a PropertiesLoginModule.
This login module uses the etc/users.properties
file as storage for the users, groups, roles and passwords.
The initial etc/users.properties
file contains:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # This file contains the users, groups, and roles. # Each line has to be of the format: # # USER=PASSWORD,ROLE1,ROLE2,... # USER=PASSWORD,_g_:GROUP,... # _g_\:GROUP=ROLE1,ROLE2,... # # All users, grousp, and roles entered in this file are available after Karaf startup # and modifiable via the JAAS command group. These users reside in a JAAS domain # with the name "karaf". # karaf = karaf,_g_:admingroup _g_\:admingroup = group,admin,manager,viewer
We can see in this file, that we have one user by default: karaf
.
The default password is karaf
.
The karaf
user is member of one group: the admingroup
.
A group is always prefixed by _g_:
. An entry without this prefix is an user.
A group defines a set of roles. By default, the admingroup
defines group
, admin
, manager
, and viewer
roles.
It means that the karaf
user will have the roles defined by the admingroup
.
Commands
The jaas:*
commands manage the realms, users, groups, roles in the console.
jaas:realm-list
We already used the jaas:realm-list
previously in this section.
The jaas:realm-list
command list the realm and the login modules for each realm:
karaf@root()> jaas:realm-list Index | Realm Name | Login Module Class Name ----------------------------------------------------------------------------------- 1 | karaf | org.apache.karaf.jaas.modules.properties.PropertiesLoginModule 2 | karaf | org.apache.karaf.jaas.modules.publickey.PublickeyLoginModule
We have here one realm (karaf
) containing two login modules (PropertiesLoginModule
and PublickeyLoginModule
).
The index
is used by the jaas:realm-manage
command to easily identify the realm/login module that we want to manage.
jaas:realm-manage
The jaas:realm-manage
command switch in realm/login module edit mode, where you can manage the users, groups, and roles in the login module.
To identify the realm and login module that you want to manage, you can use the --index
option.
The indexes are displayed by the jaas:realm-list
command:
karaf@root()> jaas:realm-manage --index 1
Another way is to use the --realm
and --module
options. The --realm
option expects the realm name, and the --module
option expects the login module class name:
karaf@root()> jaas:realm-manage --realm karaf --module org.apache.karaf.jaas.modules.properties.PropertiesLoginModule
jaas:user-list
When you are in edit mode, you can list the users in the login module using the jaas:user-list
:
karaf@root()> jaas:user-list User Name | Group | Role -------------------------------- karaf | admingroup | admin karaf | admingroup | manager karaf | admingroup | viewer
You can see the user name and the group by role.
jaas:user-add
The jaas:user-add
command adds a new user (and the password) in the currently edited login module:
karaf@root()> jaas:user-add foo bar
To "commit" your change (here the user addition), you have to execute the jaas:update
command:
karaf@root()> jaas:update karaf@root()> jaas:realm-manage --index 1 karaf@root()> jaas:user-list User Name | Group | Role -------------------------------- karaf | admingroup | admin karaf | admingroup | manager karaf | admingroup | viewer foo | |
On the other hand, if you want to rollback the user addition, you can use the jaas:cancel
command.
jaas:user-delete
The jaas:user-delete
command deletes an user from the currently edited login module:
karaf@root()> jaas:user-delete foo
Like for the jaas:user-add
command, you have to use the jaas:update
to commit your change (or jaas:cancel
to rollback):
karaf@root()> jaas:update karaf@root()> jaas:realm-manage --index 1 karaf@root()> jaas:user-list User Name | Group | Role -------------------------------- karaf | admingroup | admin karaf | admingroup | manager karaf | admingroup | viewer
jaas:group-add
The jaas:group-add
command assigns a group (and eventually creates the group) to an user in the currently edited login module:
karaf@root()> jaas:group-add karaf mygroup
jaas:group-delete
The jaas:group-delete
command removes an user from a group in the currently edited login module:
karaf@root()> jaas:group-delete karaf mygroup
jaas:group-role-add
The jaas:group-role-add
command adds a role in a group in the currently edited login module:
karaf@root()> jaas:group-role-add mygroup myrole
jaas:group-role-delete
The jaas:group-role-delete
command removes a role from a group in the currently edited login module:
karaf@root()> jaas:group-role-delete mygroup myrole
jaas:update
The jaas:update
command commits your changes in the login module backend. For instance, in the case of the PropertiesLoginModule,
the etc/users.properties
will be updated only after the execution of the jaas:update
command.
jaas:cancel
The jaas:cancel
command rollback your changes and doesn’t update the login module backend.
4.14.3. Passwords encryption
By default, the passwords are stored in clear form in the etc/users.properties
file.
It’s possible to enable encryption in the etc/org.apache.karaf.jaas.cfg
configuration file:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # Boolean enabling / disabling encrypted passwords # encryption.enabled = false # # Encryption Service name # the default one is 'basic' # a more powerful one named 'jasypt' is available # when installing the encryption feature # encryption.name = # # Encryption prefix # encryption.prefix = {CRYPT} # # Encryption suffix # encryption.suffix = {CRYPT} # # Set the encryption algorithm to use in Karaf JAAS login module # Supported encryption algorithms follow: # MD2 # MD5 # SHA-1 # SHA-256 # SHA-384 # SHA-512 # encryption.algorithm = MD5 # # Encoding of the encrypted password. # Can be: # hexadecimal # base64 # encryption.encoding = hexadecimal
If the encryption.enabled
property is set to true, the password encryption is enabled.
With encryption enabled, the password are encrypted at the first time an user logs in. The encrypted passwords are
prefixed and suffixed with \{CRYPT\
}. To re-encrypt the password, you can reset the password in clear (in etc/users.properties
file), without the \{CRYPT\
} prefix and suffix. Apache Karaf will detect that this password is in clear (because it’s not
prefixed and suffixed with \{CRYPT\
}) and encrypt it again.
The etc/org.apache.karaf.jaas.cfg
configuration file allows you to define advanced encryption behaviours:
-
the
encryption.prefix
property defines the prefix to "flag" a password as encrypted. The default is\{CRYPT\
}. -
the
encryption.suffix
property defines the suffix to "flag" a password as encrypted. The default is\{CRYPT\
}. -
the
encryption.algorithm
property defines the algorithm to use for encryption (digest). The possible values areMD2
,MD5
,SHA-1
,SHA-256
,SHA-384
,SHA-512
. The default isMD5
. -
the
encryption.encoding
property defines the encoding of the encrypted password. The possible values arehexadecimal
orbase64
. The default value ishexadecimal
.
4.14.4. Managing authentication by key
For the SSH layer, Karaf supports the authentication by key, allowing to login without providing the password.
The SSH client (so bin/client provided by Karaf itself, or any ssh client like OpenSSH) uses a public/private keys pair that will identify himself on Karaf SSHD (server side).
The keys allowed to connect are stored in etc/keys.properties
file, following the format:
user=key,role
By default, Karaf allows a key for the karaf user:
# karaf=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,admin
Note
|
For security reason, this key is disabled. We encourage to create the keys pair per client and update the |
The easiest way to create key pair is to use OpenSSH.
You can create a key pair using:
ssh-keygen -t dsa -f karaf.id_dsa -N karaf
You have now the public and private keys:
-rw------- 1 jbonofre jbonofre 771 Jul 25 22:05 karaf.id_dsa -rw-r--r-- 1 jbonofre jbonofre 607 Jul 25 22:05 karaf.id_dsa.pub
You can copy in the content of the karaf.id_dsa.pub
file in the etc/keys.properties
:
karaf=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,admin
and specify to the client to use the karaf.id_dsa
private key:
bin/client -k ~/karaf.id_dsa
or to ssh
ssh -p 8101 -i ~/karaf.id_dsa karaf@localhost
4.14.5. RBAC
Apache Karaf uses the roles to control the access to the resources: it’s a RBAC (Role Based Access Control) system.
The roles are used to control:
-
access to OSGi services
-
access to the console (control the execution of the commands)
-
access to JMX (MBeans and/or operations)
-
access to the WebConsole
OSGi services
The details about OSGi services RBAC support is explained in the developer guide.
Console
Console RBAC supports is a specialization of the OSGi service RBAC. Actually, in Apache Karaf, all console commands are defined as OSGi services.
The console command name follows the scope:name
format.
The ACL (Access Lists) are defined in etc/org.apache.karaf.command.acl.<scope>.cfg
configuration files, where <scope>
is the commands scope.
For instance, we can define the ACL to the feature:*
commands by creating a etc/org.apache.karaf.command.acl.feature.cfg
configuration file. In this etc/org.apache.karaf.command.acl.feature.cfg
configuration file, we can set:
list = viewer info = viewer install = admin uninstall = admin
Here, we define that feature:list
and feature:info
commands can be executed by users with viewer
role, whereas
the feature:install
and feature:uninstall
commands can only be executed by users with admin
role.
Note that users in the admin group will also have viewer role, so will be able to do everything.
Apache Karaf command ACLs can control access using (inside a given command scope):
-
the command name regex (e.g.
name = role
) -
the command name and options or arguments values regex (e.g.
name[/.*[0-9][0-9][0-9]+.*/] = role
to execute name only with argument value above 100)
Both command name and options/arguments support exact matching or regex matching.
By default, Apache Karaf defines the following commands ACLs:
-
etc/org.apache.karaf.command.acl.bundle.cfg
configuration file defines the ACL forbundle:*
commands. This ACL limits the execution ofbundle:*
commands for system bundles only to the users withadmin
role, whereasbundle:*
commands for non-system bundles can be executed by the users withmanager
role. -
etc/org.apache.karaf.command.acl.config.cfg
configuration file defines the ACL forconfig:*
commands. This ACL limits the execution ofconfig:*
commands withjmx.acl.*
,org.apache.karaf.command.acl.*
, andorg.apache.karaf.service.acl.*
configuration PID to the users withadmin
role. For the other configuration PID, the users with themanager
role can executeconfig:*
commands. -
etc/org.apache.karaf.command.acl.feature.cfg
configuration file defines the ACL forfeature:*
commands. Only the users withadmin
role can executefeature:install
andfeature:uninstall
commands. The otherfeature:*
commands can be executed by any user. -
etc/org.apache.karaf.command.acl.jaas.cfg
configuration file defines the ACL forjaas:*
commands. Only the users withadmin
role can executejaas:update
command. The otherjaas:*
commands can be executed by any user. -
etc/org.apache.karaf.command.acl.kar.cfg
configuration file defines the ACL forkar:*
commands. Only the users withadmin
role can executekar:install
andkar:uninstall
commands. The otherkar:*
commands can be executed by any user. -
etc/org.apache.karaf.command.acl.shell.cfg
configuration file defines the ACL forshell:*
and "direct" commands. Only the users withadmin
role can executeshell:edit
,shell:exec
,shell:new
, andshell:java
commands. The othershell:*
commands can be executed by any user.
You can change these default ACLs, and add your own ACLs for additional command scopes (for instance etc/org.apache.karaf.command.acl.cluster.cfg
for
Apache Karaf Cellar, etc/org.apache.karaf.command.acl.camel.cfg
from Apache Camel, …).
You can fine tuned the command RBAC support by editing the karaf.secured.services
property in etc/system.properties
:
# # By default, only Karaf shell commands are secured, but additional services can be # secured by expanding this filter # karaf.secured.services = (&(osgi.command.scope=*)(osgi.command.function=*))
JMX
Like for the console commands, you can define ACL (AccessLists) to the JMX layer.
The JMX ACL are defined in etc/jmx.acl<ObjectName>.cfg
configuration file, where <ObjectName>
is a MBean object name
(for instance org.apache.karaf.bundle
represents org.apache.karaf;type=Bundle
MBean).
The etc/jmx.acl.cfg
is the most generic configuration file and is used when no specific ones are found.
It contains the "global" ACL definition.
JMX ACLs can control access using (inside a JMX MBean):
-
the operation name regex (e.g.
operation* = role
) -
the operation arguments value regex (e.g.
operation(java.lang.String, int)[/([1-4])?[0-9]/,/.*/] = role
)
By default, Apache Karaf defines the following JMX ACLs:
-
etc/jmx.acl.org.apache.karaf.bundle.cfg
configuration file defines the ACL for theorg.apache.karaf:type=bundle
MBean. This ACL limits thesetStartLevel()
,start()
,stop()
, andupdate()
operations for system bundles for only users withadmin
role. The other operations can be performed by users with themanager
role. -
etc/jmx.acl.org.apache.karaf.config.cfg
configuration file defines the ACL for theorg.apache.karaf:type=config
MBean. This ACL limits the change onjmx.acl*
,org.apache.karaf.command.acl*
, andorg.apache.karaf.service.acl*
configuration PIDs for only users withadmin
role. The other operations can be performed by users with themanager
role. -
etc/jmx.acl.org.apache.karaf.security.jmx.cfg
configuration file defines the ACL for theorg.apache.karaf:type=security,area=jmx
MBean. This ACL limits the invocation of thecanInvoke()
operation for the users withviewer
role. -
etc/jmx.acl.osgi.compendium.cm.cfg
configuration file defines the ACL for theosgi.compendium:type=cm
MBean. This ACL limits the changes onjmx.acl*
,org.apache.karaf.command.acl*
, andorg.apache.karaf.service.acl*
configuration PIDs for only users withadmin
role. The other operations can be performed by users with themanager
role. -
etc/jmx.acl.java.lang.Memory.cfg
configuration file defines the ACL for the core JVM Memory MBean. This ACL limits the invocation of thegc
operation for only users with themanager
role. -
etc/jmx.acl.cfg
configuration file is the most generic file. The ACLs defined here are used when no other specific ACLs match (by specific ACL, it’s an ACL defined in another MBean specificetc/jmx.acl.*.cfg
configuration file). Thelist*()
,get*()
,is*()
operations can be performed by users with theviewer
role. Theset*()
and all other*()
operations can be performed by users with theadmin
role.
WebConsole
The Apache Karaf WebConsole is not available by default. To enable it, you have to install the webconsole
feature:
karaf@root()> feature:install webconsole
The WebConsole doesn’t support fine grained RBAC like console or JMX for now.
All users with the admin
role can logon the WebConsole and perform any operations.
4.14.6. SecurityMBean
Apache Karaf provides a JMX MBean to check if the current user can invoke a given MBean and/or operation.
The canInvoke()
operation gets the roles of the current user, and check if one the roles can invoke the MBean and/or the
operation, eventually with a given argument value.
Operations
-
canInvoke(objectName)
returnstrue
if the current user can invoke the MBean with theobjectName
,false
else. -
canInvoke(objectName, methodName)
returnstrue
if the current user can invoke the operationmethodName
on the MBean with theobjectName
,false
else. -
canInvoke(objectName, methodName, argumentTypes)
returnstrue
if the current user can invoke the operationmethodName
with the array of arguments typesargumentTypes
on the MBean withobjectName
,false
else. -
canInvoke(bulkQuery)
returns a tabular data containing for each operation in thebulkQuery
tabular data ifcanInvoke
istrue
orfalse
.
4.14.7. Security providers
Some applications require specific security providers to be available, such as [BouncyCastle|http://www.bouncycastle.org].
The JVM imposes some restrictions about the use of such jars: they have to be signed and be available on the boot classpath.
One way to deploy those providers is to put them in the JRE folder at $JAVA_HOME/jre/lib/ext
and modify the security
policy configuration ($JAVA_HOME/jre/lib/security/java.security
) in order to register such providers.
While this approach works fine, it has a global effect and requires you to configure all your servers accordingly.
Apache Karaf offers a simple way to configure additional security providers:
* put your provider jar in lib/ext
* modify the etc/config.properties
configuration file to add the following property
org.apache.karaf.security.providers = xxx,yyy
The value of this property is a comma separated list of the provider class names to register.
For instance, to add the bouncycastle security provider, you define:
org.apache.karaf.security.providers = org.bouncycastle.jce.provider.BouncyCastleProvider
In addition, you may want to provide access to the classes from those providers from the system bundle so that all bundles can access those.
It can be done by modifying the org.osgi.framework.bootdelegation
property in the same configuration file:
org.osgi.framework.bootdelegation = ...,org.bouncycastle*
4.15. OBR
The goal of OBR (OSGi Bundle Repository) is:
-
to simplify deploying and using bundles
-
to encourage independent bundle development.
OBR achieves the first goal by providing a service that can automatically install a bundle, with its deployment dependencies, from a bundle repository. This makes it easier for people to experiment with existing bundles.
The second goal is achieved by raising the visibility of the available bundles in a repository.
OBR is an optional Apache Karaf feature. You have to install the obr
feature to use OBR service:
karaf@root()> feature:install obr
The OBR feature turns Apache Karaf as an OBR client. It means that Apache Karaf can use a OBR repository to the installation of the bundles, and during the installation of the features.
The installation of the obr
feature adds in Apache Karaf:
-
the OBR service
-
the features OBR resolver
-
the
obr:*
commands -
the JMX ObrMBean
The OBR repository contains all bundles. The OBR service knows all requirements and capabilities of each bundle on an OBR repository (it’s the OBR metadata).
Thanks to that, when you install ("deploy" in OBR wording) a bundle using the OBR service, it looks for all bundles providing the capabilities matching the bundle requirements. It will automatically install the bundles needed for the bundle.
4.15.1. Features OBR resolver
If the feature specifies obr
in the resolver
attribute, Apache Karaf can use the OBR service to construct the list
of bundles to install with the features.
The feature default resolver just consider the bundles described in the feature itself.
Using the OBR resolver, Apache Karaf can extend the bundle list at the feature installation time using the OBR service.
4.15.2. Commands
obr:url-add
The obr:url-add
command registers the OBR repository at a given URL in the OBR service.
Basically, an OBR repository is described by a repository.xml
file.
The obr:url-add
command expects an url
argument. The url
argument is the URL to the OBR repository repository.xml
file.
Any URL described in the [Artifacts repositories and URLs section|urls] is supported.
For instance:
karaf@root()> obr:url-add file:///user/.m2/repository/repository.xml
obr:url-list
The obr:url-list
command lists the OBR repository (with URL) registered in the OBR service:
karaf@root()> obr:url-list Index | OBR URL --------------------------------------------------------- 0 | file:/user/.m2/repository/repository.xml
obr:url-refresh
The obr:url-refresh
command refresh an OBR repository (reloading the URL).
The OBR service doesn’t take "on the fly" the changes performed on an OBR repository repository.xml
. You have to
reload the repository.xml
URL to take the changes. It’s the purpose of the obr:url-refresh
command.
Without argument, the obr:url-refresh
command refreshes all repositories:
karaf@root()> obr:url-refresh
You can refresh only one repository by specifying the URL as argument:
karaf@root()> obr:url-refresh file:/user/.m2/repository/repository.xml
Instead of using the URL, you can use the repository index as displayed by the obr:url-list
command.
To do so, you have to use the -i
option:
karaf@root()> obr:url-refresh -i 0
obr:url-remove
The obr:url-remove
command removes an OBR repository from the OBR service.
The obr:url-remove
command expects the repository URL as argument:
karaf@root()> obr:url-remove file:/user/.m2/repository/repository.xml
Instead of using the URL, you can use the repository index as displayed by the obr:url-list
command.
To do so, you have to use the -i
option:
karaf@root()> obr:url-remove -i 0
obr:list
The obr:list
command lists all bundles available on the registered OBR repositories:
karaf@root()> obr:list|more Name | Symbolic Name | Version ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- activemq-blueprint | org.apache.activemq.activemq-blueprint | 5.10.0.SNAPSHOT activemq-camel | org.apache.activemq.activemq-camel | 5.10.0.SNAPSHOT activemq-karaf | activemq-karaf | 5.10.0.SNAPSHOT activemq-osgi | org.apache.activemq.activemq-osgi | 5.10.0.SNAPSHOT Apache Aries Application API | org.apache.aries.application.api | 1.0.1.SNAPSHOT ...
obr:info
The obr:info
command displays the details about bundles available on the OBR service. Especially, it provides details about
capabilities and requirements of bundles.
The obr:info
command expects a bundle symbolic name as argument:
karaf@root()> obr:info org.apache.karaf.wrapper.core ------------------------------- Apache Karaf :: Wrapper :: Core ------------------------------- id: org.apache.karaf.wrapper.core/3.0.0 description: Core implementation and integration of the Java Service Wrapper. It provides a complete integration of Karaf with your Operating System. documentation: http://www.apache.org/ symbolicname: org.apache.karaf.wrapper.core presentationname: Apache Karaf :: Wrapper :: Core license: http://www.apache.org/licenses/LICENSE-2.0.txt uri: file:/user/.m2/repository/org/apache/karaf/wrapper/org.apache.karaf.wrapper.core/3.0.0/org.apache.karaf.wrapper.core-3.0.0.jar size: 1281352 version: 3.0.0 Requires: service:(&(service=org.apache.aries.blueprint.NamespaceHandler)(osgi.service.blueprint.namespace=http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0)) package:(&(package=javax.management)) package:(&(package=org.apache.karaf.wrapper)) package:(&(package=org.apache.karaf.wrapper.management)) package:(&(package=org.fusesource.jansi)(version>=1.11.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework)(version>=1.7.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework.launch)(version>=1.1.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework.startlevel)(version>=1.0.0)(!(version>=2.0.0))) package:(&(package=org.osgi.service.blueprint)(version>=1.0.0)(!(version>=2.0.0))) package:(&(package=org.slf4j)(version>=1.7.0)(!(version>=2.0.0))) Capabilities: bundle:{manifestversion=2, symbolicname=org.apache.karaf.wrapper.core, presentationname=Apache Karaf :: Wrapper :: Core, version=3.0.0} service:{service=org.apache.karaf.wrapper.WrapperService} package:{package=org.apache.karaf.wrapper, version=3.0.0} package:{package=org.apache.karaf.wrapper.management, uses:=javax.management, version=3.0.0}
The obr:info
command uses the following syntax to identify the bundles: symbolic_name,version
where version
is optional.
It means that you have to use the following command to see the info about the wrapper core bundle with version 3.0.0:
karaf@root()> obr:info org.apache.karaf.wrapper.core,3.0.0 ...
You can specific multiple bundles separated by space:
karaf@root()> obr:info org.apache.karaf.wrapper.core,3.0.0 org.apache.karaf.wrapper.command,3.0.0 ...
obr:source
In addition of the bundles executable, the OBR service can also store the bundles sources.
The obr:source
command check the source URL in the OBR metadata for a given bundle, and download the sources on a target folder:
karaf@root()> obr:source /tmp org.apache.karaf.wrapper.core
The obr:source
command uses the following syntax to identify the bundles: symbolic_name,version
where version
is optional.
It means that you have to use the following command to download the source of wrapper core bundle with version 3.0.0:
karaf@root()> obr:source /tmp org.apache.karaf.wrapper.core,3.0.0
You can specify multiple bundles separated by space:
karaf@root()> obr:source /tmp org.apache.karaf.wrapper.core,3.0.0 org.apache.karaf.wrapper.command,3.0.0 ...
obr:resolve
The obr:resolve
command displays the resolution output for a given set of requirements. Actually, it show the bundles providing
the capabilities to match the requirements. It’s what the OBR service does when executing obr:deploy
.
Optionally, the obr:resolve
command can deploy the bundles as the obr:deploy
command does.
For instance, to know the OBR bundle resolving the org.apache.karaf.wrapper
package requirement, you can do:
karaf@root()> obr:resolve package=org.apache.karaf.wrapper Required resource(s): --------------------- Apache Karaf :: Wrapper :: Core (3.0.0)
obr:find
The obr:find
command is similar to the obr:resolve
one. It displays the bundles resolving the provided requirements, with details.
For instance, to find the OBR bundle providing the org.apache.karaf.wrapper
package, you can do:
karaf@root()> obr:find package=org.apache.karaf.wrapper ------------------------------- Apache Karaf :: Wrapper :: Core ------------------------------- id: org.apache.karaf.wrapper.core/3.0.0 description: Core implementation and integration of the Java Service Wrapper. It provides a complete integration of Karaf with your Operating System. documentation: http://www.apache.org/ symbolicname: org.apache.karaf.wrapper.core presentationname: Apache Karaf :: Wrapper :: Core license: http://www.apache.org/licenses/LICENSE-2.0.txt uri: file:/user/.m2/repository/org/apache/karaf/wrapper/org.apache.karaf.wrapper.core/3.0.0/org.apache.karaf.wrapper.core-3.0.0.jar size: 1281352 version: 3.0.0 Requirements: service:(&(service=org.apache.aries.blueprint.NamespaceHandler)(osgi.service.blueprint.namespace=http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0)) package:(&(package=javax.management)) package:(&(package=org.apache.karaf.wrapper)) package:(&(package=org.apache.karaf.wrapper.management)) package:(&(package=org.fusesource.jansi)(version>=1.11.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework)(version>=1.7.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework.launch)(version>=1.1.0)(!(version>=2.0.0))) package:(&(package=org.osgi.framework.startlevel)(version>=1.0.0)(!(version>=2.0.0))) package:(&(package=org.osgi.service.blueprint)(version>=1.0.0)(!(version>=2.0.0))) package:(&(package=org.slf4j)(version>=1.7.0)(!(version>=2.0.0))) Capabilities: bundle:{manifestversion=2, symbolicname=org.apache.karaf.wrapper.core, presentationname=Apache Karaf :: Wrapper :: Core, version=3.0.0} service:{service=org.apache.karaf.wrapper.WrapperService} package:{package=org.apache.karaf.wrapper, version=3.0.0} package:{package=org.apache.karaf.wrapper.management, uses:=javax.management, version=3.0.0}
obr:deploy
The obr:deploy
command installs a bundle from the OBR repository, including all bundles required to satisfy the bundle requirements.
karaf@root()> obr:deploy org.ops4j.pax.web.samples.helloworld-hs Target resource(s): ------------------- OPS4J Pax Web - Samples - Hello World - HttpService (4.0.0.SNAPSHOT) Required resource(s): --------------------- Apache ServiceMix :: Specs :: Activation API 1.4 (2.3.0.SNAPSHOT) OPS4J Pax Web - Jetty Bundle (4.0.0.SNAPSHOT) Deploying...done.
By default, the bundles are just installed, not started. You can use the -s
option to start the bundles.
The obr:deploy
command uses the following syntax to identify the bundles: symbolic_name,version
where version
is optional.
It means that you have to use the following command to deploy the wrapper core bundle with version 3.0.0:
karaf@root()> obr:deploy org.apache.karaf.wrapper.core,3.0.0
You can specify multiple bundles separated by space:
karaf@root()> obr:deploy org.apache.karaf.wrapper.core,3.0.0 org.apache.karaf.wrapper.command,3.0.0 ...
4.15.3. obr:start
The obr:start
command does the same as obr:deploy -s
command. It installs the bundle (and all required bundles to
satisfy the requirements) and starts all installed bundles.
karaf@root()> obr:start org.ops4j.pax.web.samples.helloworld-hs Target resource(s): ------------------- OPS4J Pax Web - Samples - Hello World - HttpService (4.0.0.SNAPSHOT) Required resource(s): --------------------- Apache ServiceMix :: Specs :: Activation API 1.4 (2.3.0.SNAPSHOT) OPS4J Pax Web - Jetty Bundle (4.0.0.SNAPSHOT) Deploying...done.
The obr:start
command uses the following syntax to identify the bundles: symbolic_name,version
where version
is optional.
It means that you have to use the following command to deploy and start the wrapper core bundle with version 3.0.0:
karaf@root()> obr:start org.apache.karaf.wrapper.core,3.0.0
You can specify multiple bundles separated by space:
karaf@root()> obr:start org.apache.karaf.wrapper.core,3.0.0 org.apache.karaf.wrapper.command,3.0.0 ...
4.15.4. JMX ObrMBean
On the JMX layer, Apache Karaf provides a MBean dedicated to the management of the OBR service: the ObrMBean.
The ObjectName to use is org.apache.karaf:type=obr,name=*
.
Attributes
The Urls
attribute provides the list of registered OBR repositories URLs.
The Bundles
attribute provides a tabular data containing all bundles available on the registered OBR repositories.
Operations
-
addUrl(url)
registers the OBR repository using theurl
to therepository.xml
. -
removeUrl(url)
removes the OBR repository at the givenurl
. -
refreshUrl(url)
refreshes the OBR repository at the givenurl
. -
deployBundle(name)
deploys a bundle (and all bundles required to satisfy the requirements) using the OBR service. The bundles are not automatically started. -
deployBundle(name, start, deployOptional)
deploys a bundle (and all bundles required to satisfy the requirements) using the OBR service. Ifstart
istrue
, the bundles are automatically started. IfdeployOptional
istrue
, even the optional requirements will be resolved by the OBR service (meaning installing more bundles to satisfy the optional requirements).
The name to identify a bundle uses the following syntax: symbolic_name,version
where version is optional.
4.15.5. Apache Karaf Cave
In addition of being an OBR client, Apache Karaf can act as an OBR repositories server, thanks to Apache Karaf Cave.
See the Apache Karaf Cave for details.
4.16. Enterprise
4.16.1. WebContainer (JSP/Servlet)
Apache Karaf can act a complete WebContainer, fully supporting JSP/Servlet specification.
Apache Karaf WebContainer supports both:
-
WAB (WebApplication Bundles) which are OSGi native web applications
-
WAR (WebApplication aRchives) which are non-OSGi web applications (the same as you can deploy in any web container like Apache Tomcat)
To enable the Apache Karaf WebContainer, you just have to install the war
feature:
karaf@root()> feature:install war
Note
|
The installation of the |
The war
feature provides:
-
an embedded web container (powered by Jetty), with its configuration
-
a set of console commands
-
a new war deployer
Configuration
The default port used by the WebContainer is 8181.
The WebContainer configuration is in the etc/jetty.xml
configuration file.
The etc/jetty.xml
is a standard Eclipse Jetty configuration file.
The default Apache Karaf WebContainer etc/jetty.xml
contains:
<?xml version="1.0"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting// DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd"> <Configure class="org.eclipse.jetty.server.Server"> <!-- =========================================================== --> <!-- Set connectors --> <!-- =========================================================== --> <!-- One of each type! --> <!-- =========================================================== --> <!-- Use this connector for many frequently idle connections and for threadless continuations. --> <Call name="addConnector"> <Arg> <New class="org.eclipse.jetty.server.nio.SelectChannelConnector"> <Set name="host"> <Property name="jetty.host" /> </Set> <Set name="port"> <Property name="jetty.port" default="8181" /> </Set> <Set name="maxIdleTime">300000</Set> <Set name="Acceptors">2</Set> <Set name="statsOn">false</Set> <Set name="confidentialPort">8443</Set> <Set name="lowResourcesConnections">20000</Set> <Set name="lowResourcesMaxIdleTime">5000</Set> </New> </Arg> </Call> <!-- =========================================================== --> <!-- Configure Authentication Realms --> <!-- Realms may be configured for the entire server here, or --> <!-- they can be configured for a specific web app in a context --> <!-- configuration (see $(jetty.home)/contexts/test.xml for an --> <!-- example). --> <!-- =========================================================== --> <Call name="addBean"> <Arg> <New class="org.eclipse.jetty.plus.jaas.JAASLoginService"> <Set name="name">karaf</Set> <Set name="loginModuleName">karaf</Set> <Set name="roleClassNames"> <Array type="java.lang.String"> <Item>org.apache.karaf.jaas.boot.principal.RolePrincipal </Item> </Array> </Set> </New> </Arg> </Call> <Call name="addBean"> <Arg> <New class="org.eclipse.jetty.plus.jaas.JAASLoginService"> <Set name="name">default</Set> <Set name="loginModuleName">karaf</Set> <Set name="roleClassNames"> <Array type="java.lang.String"> <Item>org.apache.karaf.jaas.boot.principal.RolePrincipal </Item> </Array> </Set> </New> </Arg> </Call> </Configure>
The SelectChannelConnector
defines the default connector of the WebContainer.
This connector defines the 8181 port number for the HTTP protocol (port
property), and the 8443 port number for the
HTTPS protocol (confidentialPort
property).
By default, Apache Karaf bind these ports on all network interfaces (0.0.0.0
). You can config the host
property
to bind on a specific network interface (with a given IP address).
The following resources give you details about advanced etc/jetty.xml
configurations:
Deploy
Apache Karaf WebContainer is able to deploy:
-
pure OSGi WebApplication Bundle (WAB)
-
"classical" standard WebApplication aRchive (WAR)
WAB (WebApplication Bundle)
A WAB is a standard WAR or JAR archive containing at least the following properties in the MANIFEST:
-
Bundle-ManifestVersion: 2
defines that the bundle follows the rules of R4 specification. -
Bundle-SymbolicName
specifies a unique, non-localizable name for the bundle. This name should be based on the reverse domain name convention. -
Web-ContextPath
specifies the location of the web application.
WAB can be deployed directly in Apache Karaf, for instance, by dropping the archive in the deploy
folder, or using the
bundle:install
command.
For instance, the Apache Karaf manual (documentation) is available as a WAB that you can deploy directly in a running instance:
karaf@root()> bundle:install -s mvn:org.apache.karaf/manual/3.0.0/war
WAR (WebApplication aRchive)
Apache Karaf allows you to deploy directly WAR files without repackaging as WAB.
Using the webbundle
prefix and providing headers directly on the URL, Apache Karaf creates a WAB "on the fly".
For instance, you can deploy the Apache Tomcat sample non-OSGi "classical" WAR with the following command:
karaf@root()> bundle:install -s "webbundle:http://tomcat.apache.org/tomcat-7.0-doc/appdev/sample/sample.war?Bundle-SymbolicName=tomcat-sample&Web-ContextPath=/sample"
You can note the webbundle
prefix, and the Bundle-SymbolicName
and Web-ContextPath
headers on the URL.
Commands
http:list
The http:list
lists the available Servlets deployed in the WebContainer.
For instance, if you have installed the Apache Karaf WebConsole, you can see the WebConsole Servlets:
karaf@root()> http:list ID | Servlet | Servlet-Name | State | Alias | Url ----------------------------------------------------------------------------------------------------- 113 | ResourceServlet | /res | Deployed | /system/console/res | [/system/console/res/*] 113 | KarafOsgiManager | ServletModel-2 | Undeployed | /system/console | [/system/console/*] 113 | KarafOsgiManager | ServletModel-5 | Deployed | /system/console | [/system/console/*]
The ID
is the ID of the bundle which provides the servlet (113
here).
The State
is the current state of the Servlet (Deployed
or Undeployed
).
The Url
is the URL where the Servlet is available.
web:list
The web:list
command lists the WebApplication Bundles ("native" WAB or "wrapped WAR") deployed in the WebContainer.
For instance, if you installed the Apache Karaf manual WAR file as described previously, you can see it with web:list
:
karaf@root()> web:list ID | State | Web-State | Level | Web-ContextPath | Name --------------------------------------------------------------------------------------------------- 111 | Active | Deployed | 80 | /karaf-doc | Apache Karaf :: Manual (3.0.0)
web:stop
The web:stop
command stops a web application in the WebContainer. The web:stop
command expects a id
argument
corresponding to the bundle ID (as displayed by the web:list
command).
For instance, to stop the Apache Karaf manual web application:
karaf@root()> web:stop 111
web:start
The web:start
command starts a web application in the WebContainer. The web:start
command expects a id
argument
corresponding to the bundle ID (as displayed by the web:list
command).
For instance, to start the Apache Karaf manual web application:
karaf@root()> web:start 111
JMX HttpMBean
On the JMX layer, you have a MBean dedicated to the manipulation of the Servlets: the HttpMBean.
The ObjectName to use is org.apache.karaf:type=http,name=*
.
Attributes
The Servlets
attribute provides a tabular data providing the list of deployed Servlets including:
-
Alias
is the Servlet URL alias. -
Bundle-ID
is the ID of the bundle which provides this Servlet. -
Servlet
is the class name of the Servlet. -
State
is the current Servlet state (Deployed
orUndeployed
). -
URL
is the URL of the Servlet (the Servlet context path).
JMX WebMBean
On the JMX layer, you have a MBean dedicated to the manipulation of the Web Applications: the WebMBean.
The ObjectName to use is org.apache.karaf:type=web,name=*
.
Attributes
The WebBundles
attribute provides a tabular data providing the list of deployed Web Applications including:
-
ID
is the ID of the bundle providing the Web Application. -
Level
is the bundle start level. -
Name
is the bundle symbolic name providing the Web Application. -
State
is the current state of the bundle. -
Web-ContextPath
is the context path of the Web Application. -
Web-State
is the current status of the Web Application (Deployed
orUndeployed
).
Operations
-
start(id)
starts the web context of the bundle withid
. -
start(list)
starts the web context of the bundles with ID in the providedlist
. -
stop(id)
stops the web context of the bundle withid
. -
stop(list)
stops the web context of the bundles with ID in the providedlist
.
4.16.2. Naming (JNDI)
The Apache Karaf Naming (JNDI) is an optional enterprise feature.
You have to install the jndi
feature first:
karaf@root()> feature:install jndi
Apache Karaf provides a complete JNDI support.
You have two parts in the Apache Karaf JNDI support:
-
a fully compliant implementation of the OSGi Alliance JNDI Service specification.
-
a more "regular" JNDI context, containing different names that you can administrate.
OSGi Services Registry and JNDI
The OSGi Service Registry provides a centralized register/query capabilities for OSGi services.
A common pattern outside of OSGi is to make use of JNDI API to access services from a directory system. The OSGi service registry can be viewed as an example of such a system.
Apache Karaf supports the osgi:service
lookup scheme as defined by the JNDI Service Specification.
The schema is:
osgi:service/<interface>[/<filter>]
For instance, you can directly use JNDI to get a OSGi service:
Context ctx = new InitialContext(); Runnable r = (Runnable) ctx.lookup("osgi:service/java.lang.Runnable");
JNDI service
Apache Karaf also supports regular JNDI, including a directoy system where you can register name bindings, sub-context, etc.
It supports the standard JNDI API:
Context ctx = new InitialContext(); Runnable r = (Runnable) ctx.lookup("this/is/the/name");
It also allows you to bind some OSGi services as "pure" JNDI name. In that case, you don’t have to use the specific
osgi:service
scheme.
Commands
Apache Karaf provides specific commands to manipulate the JNDI service.
jndi:names
The jndi:names
command lists all JNDI names. It groups both the JNDI names from the osgi:service
scheme and the
regular JNDI names:
karaf@root()> jndi:names JNDI Name | Class Name ------------------------------------------------------------------ osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl jndi/service | org.apache.karaf.jndi.internal.JndiServiceImpl
We can see here the osgi:service/jndi
name (using the osgi:service
scheme) and jndi/service
name (using the
regular JNDI service).
The jndi:names
command accepts an optional context
argument to list names on the given context.
For instance, you can list only names in the jndi
sub-context:
karaf@root()> jndi:names jndi JNDI Name | Class Name ---------------------------------------------------------- service | org.apache.karaf.jndi.internal.JndiServiceImpl
Note
|
The |
jndi:contexts
The jndi:contexts
command lists all JNDI sub-contexts:
karaf@root()> jndi:contexts JNDI Sub-Context ---------------- other/context foo/bar
jndi:create
The jndi:create
command creates a new JNDI sub-context:
karaf@root()> jndi:create my/company
jndi:delete
The jndi:delete
command deletes a JNDI sub-context:
karaf@root()> jndi:delete my/company
jndi:alias
The jndi:alias
command creates a new JNDI name (alias) with an existing one.
The existing JNDI name can be a regular one:
karaf@root()> jndi:alias bean/services/jndi aliases/services/jndi karaf@root()> jndi:names JNDI Name | Class Name ---------------------------------------------------------------------- osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl bean/services/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl aliases/services/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl
or a name from the osgi:service
schema:
karaf@root()> jndi:alias osgi:service/jndi alias/jndi/service karaf@root()> jndi:names JNDI Name | Class Name ------------------------------------------------------------------- osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl alias/jndi/service | org.apache.karaf.jndi.internal.JndiServiceImpl
Note
|
The |
jndi:bind
The jndi:bind
command binds an OSGi service with a JNDI name.
The jndi:bind
command requires an OSGi service ID and a JNDI name. The OSGi service ID can be found using the service:list
command.
For instance, we can bind the OSGi service with ID 344 with the JNDI name services/kar
:
karaf@root()> jndi:bind 344 services/kar karaf@root()> jndi:names JNDI Name | Class Name ------------------------------------------------------------------------------- osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl services/kar | org.apache.karaf.kar.internal.KarServiceImpl
jndi:unbind
The jndi:unbind
command unbind a given JNDI name:
karaf@root()> jndi:names JNDI Name | Class Name ------------------------------------------------------------------------------- osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl services/kar | org.apache.karaf.kar.internal.KarServiceImpl karaf@root()> jndi:unbind services/kar karaf@root()> jndi:names JNDI Name | Class Name ------------------------------------------------------------------------------- osgi:service/jndi | org.apache.karaf.jndi.internal.JndiServiceImpl
Note
|
It’s not possible to unbind a name from the |
JMX JndiMBean
The JMX JndiMBean provides the JNDI names, and the operations to manipulate the JNDI service.
The object name to use is org.apache.karaf:type=jndi,name=*
.
Attributes
The Names
attribute provides a map containing all JNDI names and class names from both osgi:service
scheme
and the regular JNDI service.
The Contexts
attribute provides a list containing all JNDI sub-contexts.
Operations
-
getNames(context)
provides a map containing JNDI names and class names in a given JNDI sub-context. -
create(context)
creates a new JNDI sub-context. -
delete(context)
deletes a JNDI sub-context. -
alias(name, alias
creates a JNDI name (alias) for a given one. -
bind(serviceId, name
binds a JNDI name using an OSGi service (identified by its ID). -
unbind(name)
unbinds a JNDI name.
4.16.3. Transaction (JTA)
Apache Karaf provides container managed transactions, available as OSGi services.
As most of the enterprise features, it’s an optional feature that you can install with:
karaf@root()> feature:install transaction
However, the transaction
feature is installed (as a transitive dependency) when installing enterprise features
(like jdbc
or jms
features for instance).
Apache Aries Transaction and ObjectWeb HOWL
The transaction
feature uses Apache Aries and ObjectWeb HOWL. Aapache Aries Transaction "exposes" the transaction
manager as OSGi service. The actual implementation of the transaction manager is ObjectWeb HOWL.
ObjectWeb HOWL is a logger implementation providing features required by the ObjectWeb JOTM project, with a public API that is generally usable by any Transaction Manager. ObjectWeb HOWL uses unformatted binary logs to maximize performance and specifies a journalization API with methods necessary to support JOTM recovery operations.
ObjectWeb HOWL is intended to be used for logging of temporary data such as XA transaction events. It is not a replacement for traditional log kits such as LOG4J and Java SE Logging.
In Apache Karaf, ObjectWeb HOWL (High-speed ObjectWeb Logger) is used to implement TransactionLog (in Aries Transaction), providing a very performant transaction manager in an OSGi way.
Configuration
The installation of the transaction
feature installs a new configuration: org.apache.aries.transaction
.
You can see the configuration properties using:
karaf@root()> config:list "(service.pid=org.apache.aries.transaction)" ---------------------------------------------------------------- Pid: org.apache.aries.transaction BundleLocation: mvn:org.apache.aries.transaction/org.apache.aries.transaction.manager/1.1.0 Properties: aries.transaction.recoverable = true aries.transaction.timeout = 600 service.pid = org.apache.aries.transaction org.apache.karaf.features.configKey = org.apache.aries.transaction aries.transaction.howl.maxBlocksPerFile = 512 aries.transaction.howl.maxLogFiles = 2 aries.transaction.howl.logFileDir = /opt/apache-karaf-3.0.0/data/txlog aries.transaction.howl.bufferSizeKBytes = 4
-
aries.transaction.recoverable
property is a flag to enable support of recoverable resource or not. A recoverable resource is a transactional object whose state is saved to stable storage if the transaction is committed, and whose state can be reset to what it was at the beginning of the transaction if the transaction is rolled back. At commit time, the transaction manager uses the two-phase XA protocol when communicating with the recoverable resource to ensure transactional integrity when more than one recoverable resource is involved in the transaction being committed. Transactional databases and message brokers like Apache ActiveMQ are examples of recoverable resources. A recoverable resource is represented using the javax.transaction.xa.XAResource interface in JTA. Default istrue
. -
aries.transaction.timeout
property is the transaction timeout. If a transaction has a lifetime longer than this timeout a transaction exception is raised and the transaction is rollbacked. Default is600
(10 minutes). -
aries.transaction.howl.logFileDir
property is the directory where the transaction logs (journal) are stored. Default isKARAF_DATA/txlog
. -
aries.transaction.howl.maxLogFiles
property is the maximum number of transaction log files to retain. Combined with thearies.transaction.howl.maxBlocksPerFile
, it defines the transaction retention.
You can change the configuration directly using the config:*
commands, or the Config MBean.
For instance, to increase the transaction timeout, you can do:
karaf@root()> config:edit org.apache.aries.transaction karaf@root()> config:property-set aries.transaction.timeout 1200 karaf@root()> config:update karaf@root()> config:list "(service.pid=org.apache.aries.transaction)" ---------------------------------------------------------------- Pid: org.apache.aries.transaction BundleLocation: mvn:org.apache.aries.transaction/org.apache.aries.transaction.manager/1.1.0 Properties: aries.transaction.recoverable = true aries.transaction.timeout = 1200 service.pid = org.apache.aries.transaction org.apache.karaf.features.configKey = org.apache.aries.transaction aries.transaction.howl.maxBlocksPerFile = 512 aries.transaction.howl.maxLogFiles = 2 aries.transaction.howl.logFileDir = /opt/apache-karaf-3.0.0/data/txlog aries.transaction.howl.bufferSizeKBytes = 4
Note
|
The # etc/org.apache.aries.transaction.cfg aries.transaction.recoverable = true aries.transaction.timeout = 1200 aries.transaction.howl.maxBlocksPerFile = 512 aries.transaction.howl.maxLogFiles = 2 aries.transaction.howl.logFileDir = /opt/apache-karaf-3.0.0/data/txlog aries.transaction.howl.bufferSizeKBytes = 4 |
4.16.4. DataSources (JDBC)
The Apache Karaf DataSources (JDBC) is an optional enterprise feature.
You have to install the jdbc
feature first:
karaf@root()> feature:install jdbc
This feature provides an OSGi service to create/delete JDBC datasources in the container and perform database operations (SQL queries).
This JDBC OSGi service can be manipulated programmatically (see the developer guide for details), using the jdbc:*
commands, or using the JDBC MBean.
Commands
jdbc:create
The jdbc:create
command automatically creates a datasource definition file in the Apache Karaf deploy
folder.
The jdbc:create
accepts a set of options and the name argument:
karaf@root()> jdbc:create --help DESCRIPTION jdbc:create Create a JDBC datasource SYNTAX jdbc:create [options] name ARGUMENTS name The JDBC datasource name OPTIONS -u, --username The database username -v, --version The version of the driver to use -t, --type The JDBC datasource type (generic, MySQL, Oracle, Postgres, H2, HSQL, Derby, MSSQL) -url The JDBC URL to use -p, --password The database password -i, --install-bundles Try to install the bundles providing the JDBC driver -d, --driver The classname of the JDBC driver to use. NB: this option is used only the type generic --help Display this help message
-
the
name
argument is required. It’s the name of the datasource. The name is used to identify the datasource, and to create the datasource definition file (deploy/datasource-[name].xml
). -
the
-u
option is optional. It defines the database username. -
the
-v
option is optional. It "forces" a given JDBC driver version (only used with the-i
option). -
the
-t
option is required. It defines the JDBC datasource type. Accepted values are: MySQL, Oracle, Postgres, Derby, H2, HSQL, MSSQL, Generic. Generic is a generic configuration file using DBCP to create a pooled datasource. When using generic, it’s up to you to install the JDBC driver and configure thedeploy/datasource-[name].xml
datasource file. -
the
-url
option is optional. It defines the JDBC URL to access to the database. -
the
-p
option is optional. It defines the database password. -
the
-d
option is optional. It defines the JDBC driver classname to use (only used with the generic type). -
the
-i
option is optional. If specified, the command will try to automatically install the OSGi bundles providing the JDBC driver (depending of the datasource type specified by the-t
option).
For instance, to create an embedded Apache Derby database in Apache Karaf, you can do:
karaf@root()> jdbc:create -t derby -u test -i test
We can note that the Derby bundle has been installed automatically, and the datasource has been created:
karaf@root()> la ... 87 | Active | 80 | 10.8.2000002.1181258 | Apache Derby 10.8 88 | Active | 80 | 0.0.0 | datasource-test.xml
We can see the deploy/datasource-test.xml
datasource file.
jdbc:delete
The jdbc:delete
command deletes a datasource by removing the deploy/datasource-[name].xml
datasource file:
karaf@root()> jdbc:delete test
Note
|
The |
jdbc:datasources
The jdbc:datasources
command lists the JDBC datasources:
karaf@root()> jdbc:datasources Name | Product | Version | URL ------------------------------------------------------------------ /jdbc/test | Apache Derby | 10.8.2.2 - (1181258) | jdbc:derby:test
jdbc:info
The jdbc:info
command provides details about a JDBC datasource:
karaf@root()> jdbc:info /jdbc/test Property | Value -------------------------------------------------- driver.version | 10.8.2.2 - (1181258) username | APP db.version | 10.8.2.2 - (1181258) db.product | Apache Derby driver.name | Apache Derby Embedded JDBC Driver url | jdbc:derby:test
jdbc:execute
The jdbc:execute
command executes a SQL query that doesn’t return any result on a given JDBC datasource.
Typically, you can use the jdbc:execute
command to create tables, insert values into tables, etc.
For instance, we can create a person
table on our test
datasource:
karaf@root()> jdbc:execute /jdbc/test "create table person(name varchar(100), nick varchar(100))"
And we can insert some records in the person
table:
karaf@root()> jdbc:execute /jdbc/test "insert into person(name, nick) values('foo','bar')" karaf@root()> jdbc:execute /jdbc/test "insert into person(name, nick) values('test','test')"
jdbc:query
The jdbc:query
command is similar to the jdbc:execute
one but it displays the query result.
For instance, to display the content of the person
table, we can do:
karaf@root()> jdbc:query /jdbc/test "select * from person" NICK | NAME -------------------------------- bar | foo test | test
jdbc:tables
The jdbc:tables
command displays all tables available on a given JDBC datasource:
karaf@root()> jdbc:tables /jdbc/test REF_GENERATION | TYPE_NAME | TABLE_NAME | TYPE_CAT | REMARKS | TYPE_SCHEM | TABLE_TYPE | TABLE_SCHEM | TABLE_CAT | SELF_REFERENCING_COL_NAME ---------------------------------------------------------------------------------------------------------------------------------------------------- | | SYSALIASES | | | | SYSTEM TABLE | SYS | | | | SYSCHECKS | | | | SYSTEM TABLE | SYS | | | | SYSCOLPERMS | | | | SYSTEM TABLE | SYS | | | | SYSCOLUMNS | | | | SYSTEM TABLE | SYS | | | | SYSCONGLOMERATES | | | | SYSTEM TABLE | SYS | | | | SYSCONSTRAINTS | | | | SYSTEM TABLE | SYS | | | | SYSDEPENDS | | | | SYSTEM TABLE | SYS | | | | SYSFILES | | | | SYSTEM TABLE | SYS | | | | SYSFOREIGNKEYS | | | | SYSTEM TABLE | SYS | | | | SYSKEYS | | | | SYSTEM TABLE | SYS | | | | SYSPERMS | | | | SYSTEM TABLE | SYS | | | | SYSROLES | | | | SYSTEM TABLE | SYS | | | | SYSROUTINEPERMS | | | | SYSTEM TABLE | SYS | | | | SYSSCHEMAS | | | | SYSTEM TABLE | SYS | | | | SYSSEQUENCES | | | | SYSTEM TABLE | SYS | | | | SYSSTATEMENTS | | | | SYSTEM TABLE | SYS | | | | SYSSTATISTICS | | | | SYSTEM TABLE | SYS | | | | SYSTABLEPERMS | | | | SYSTEM TABLE | SYS | | | | SYSTABLES | | | | SYSTEM TABLE | SYS | | | | SYSTRIGGERS | | | | SYSTEM TABLE | SYS | | | | SYSVIEWS | | | | SYSTEM TABLE | SYS | | | | SYSDUMMY1 | | | | SYSTEM TABLE | SYSIBM | | | | PERSON | | | | TABLE | APP | |
JMX JDBC MBean
The JMX JDBC MBean provides the JDBC datasources, and the operations to manipulate datasources and database.
The object name to use is org.apache.karaf:type=jdbc,name=*
.
Attributes
The Datasources
attribute provides a tabular data of all JDBC datasource, containing:
-
name
is the JDBC datasource name -
product
is the database product backend -
url
is the JDBC URL used by the datasource -
version
is the database version backend.
Operations
-
create(name, type, jdbcDriverClassName, version, url, user, password, installBundles)
creates a JDBC datasource (the arguments correspond to the options of thejdbc:create
command). -
delete(name)
deletes a JDBC datasource. -
info(datasource)
returns a Map (String/String) of details about a JDBCdatasource
. -
tables(datasource)
returns a tabular data containing the tables available on a JDBCdatasource
. -
execute(datasource, command
executes a SQL command on the given JDBCdatasource
. -
query(datasource, query
executes a SQL query on the given JDBCdatasource
and return the execution result as tabular data.
4.16.5. MOM (JMS)
The Apache Karaf MOM (Messaging Oriented Middleware/JMS) is an optional enterprise feature.
You have to install the jms
feature first:
karaf@root()> feature:install jms
The jms
feature doesn’t install a JMS broker: it just installs the OSGi service, commands, and MBean to interact with
a JMS broker (not the broker itself).
It means that you have to install a JMS broker itself.
This JMS broker can be available:
-
outside of Apache Karaf, as a standalone broker. In that case, Apache Karaf JMS will remotely connect to the JMS broker. For instance, you can use this topology with Apache ActiveMQ or IBM WebsphereMQ.
-
embedded in Apache Karaf. With this topology, Apache Karaf itself provides a JMS broker service. Apache ActiveMQ provides a native support in Apache Karaf.
For instance, you can install Apache ActiveMQ directly in Apache Karaf:
karaf@root()> feature:repo-add activemq Adding feature url mvn:org.apache.activemq/activemq-karaf/LATEST/xml/features karaf@root()> feature:install activemq-broker
The activemq-broker
feature installs:
-
a Apache ActiveMQ broker directly in Apache Karaf, bind to the
61616
port number by default. -
the Apache ActiveMQ WebConsole bound to
http://0.0.0.0:8181/activemqweb
by default.
The Apache Karaf jms
feature provides an OSGi service to create/delete JMS connection factories in the container
and perform JMS operations (send or consume messages, get information about a JMS broker, list the destinations, …).
This JMS OSGi service can be manipulated programmatically (see the developer guide for details), using the jms:*
commands, or using the JMS MBean.
Commands
jms:create
The jms:create
command creates a JMS connection factory in the Apache Karaf container. It automatically creates a
blueprint XML file in the deploy
folder containing the JMS connection factory definition corresponding
to the type that you mentioned.
The jms:create
command accepts different arguments and options:
karaf@root()> jms:create --help DESCRIPTION jms:create Create a JMS connection factory. SYNTAX jms:create [options] name ARGUMENTS name The JMS connection factory name OPTIONS -t, --type The JMS connection factory type (ActiveMQ or WebsphereMQ) (defaults to ActiveMQ) -u, --username Username to connect to the JMS broker (defaults to karaf) --help Display this help message --url URL of the JMS broker. For WebsphereMQ type, the URL is hostname/port/queuemanager/channel (defaults to tcp://localhost:61616) -p, --password Password to connect to the JMS broker (defaults to karaf)
-
the
name
argument is required. It’s the name of the JMS connection factory. The name is used to identify the connection factory, and to create the connection factory definition file (deploy/connectionfactory-[name].xml
). -
the
-t
(--type
) option is required. It’s the type of the JMS connection factory. Currently onactivemq
andwebspheremq
type are supported. If you want to use another type of JMS connection factory, you can create thedeploy/connectionfactory-[name].xml
file by hand (using one as template). -
the
--url
option is required. It’s the URL used by the JMS connection factory to connect to the broker. If the type isactivemq
, the URL looks liketcp://localhost:61616
. If the type iswebspheremq
, the URL looks likehost/port/queuemanager/channel
. -
the
-u
(--username
) option is optional (karaf by default). In the case of the broker requires authentication, it’s the username used. -
the
-p
(--password
) option is optional (karaf by default). In the case of the broker requires authentication, it’s the password used.
For instance, to create a JMS connection factory for a Apache ActiveMQ broker, you can do:
karaf@root()> jms:create -t activemq --url tcp://localhost:61616 test
Note
|
The |
In the previous example, we assume that you previously installed the activemq-broker
feature.
We can see the created JMS connection factory:
karaf@root()> la ... 151 | Active | 80 | 0.0.0 | connectionfactory-test.xml
The connectionfactory-test.xml
file has been created in the deploy
folder.
By default, the jms:create
command constructs a JNDI name for the connection factory: /jms/[name]
.
It means that the connection factory name to use for the other jms:*
commands is /jms/[name]
.
jms:delete
The jms:delete
command deletes a JMS connection factory. The name
argument is the name that you used at creation time:
karaf@root()> jms:delete test
jms:connectionfactories
The jms:connectionfactories
command lists the JMS connection factories:
karaf@root()> jms:connectionfactories JMS Connection Factory ---------------------- /jms/test
jms:info
The jms:info
command provides details about the JMS connection factory:
karaf@root()> jms:info /jms/test Property | Value ------------------- product | ActiveMQ version | 5.9.0
You can see the JMS broker product and version.
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
jms:queues
The jms:queues
command lists the JMS queues available on a JMS broker. For instance:
karaf@root()> jms:queues /jms/test JMS Queues ---------- MyQueue
where /jms/test
is the name of the JMS connection factory.
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
Note
|
Depending of the JMS connection factory type, this command may not work. For now, the command works only with Apache ActiveMQ. |
jms:topics
The jms:topics
command lists the JMS topics available on a JMS broker. For instance:
karaf@root()> jms:topics /jms/test JMS Topics ---------- MyTopic
where /jms/test
is the name of the JMS connection factory.
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
Note
|
Depending of the JMS connection factory type, this command may not work. For now, the command works only with Apache ActiveMQ. |
jms:send
The jms:send
command sends a message to a given JMS queue.
For instance, to send a message containing Hello World
in the MyQueue
queue, you can do:
karaf@root()> jms:send /jms/test MyQueue "Hello World"
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
jms:consume
The jms:consume
command consumes messages from a JMS queue.
For instance, to consume all messages from MyQueue
, you can do:
karaf@root()> jms:consume /jms/test MyQueue 2 message(s) consumed
If you want to consume only some messages, you can define a selector using the -s
(--selector
) option.
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
Note
|
The |
jms:count
The jms:count
command counts the number of pending messages into a JMS queue.
For instance, if you want to know the number of messages on MyQueue
, you can do:
karaf@root()> jms:count /jms/test MyQueue Messages Count -------------- 8
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
jms:browse
The jms:browse
command browses a JMS queue and display details about messages.
For instance, to browse the MyQueue
queue:
karaf@root()> jms:browse /jms/test MyQueue Message ID | Content | Charset | Type | Correlation ID | Delivery Mode | Destination | Expiration | Priority | Redelivered | ReplyTo | Timestamp ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ID:vostro-59602-1387462183019-3:1:1:1:1 | Hello World | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:12 CET 2013 ID:vostro-59602-1387462183019-3:2:1:1:1 | Hello ActiveMQ | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:16 CET 2013 ID:vostro-59602-1387462183019-3:3:1:1:1 | Hello Karaf | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:19 CET 2013
By default, the messages properties are not displayed. You can use the -v
(--verbose
) option to display the properties:
karaf@root()> jms:browse -v /jms/test MyQueue Message ID | Content | Charset | Type | Correlation ID | Delivery Mode | Destination | Expiration | Priority | Redelivered | ReplyTo | Timestamp | Properties ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ID:vostro-59602-1387462183019-3:1:1:1:1 | Hello World | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:12 CET 2013 | ID:vostro-59602-1387462183019-3:2:1:1:1 | Hello ActiveMQ | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:16 CET 2013 | ID:vostro-59602-1387462183019-3:3:1:1:1 | Hello Karaf | UTF-8 | | | Persistent | queue://MyQueue | Never | 4 | false | | Thu Dec 19 15:10:19 CET 2013 |
If you want to browse only some messages, you can define a selector using the -s
(--selector
) option.
If the JMS broker requires an authentication, you can use the -u
(--username
) and -p
(--password
) options.
jms:move
The jms:move
command consumes all messages from a JMS queue and send it to another one.
For instance, to move all messages from MyQueue
queue to AnotherQueue
queue, you can do:
karaf@root()> jms:move /jms/test MyQueue AnotherQueue 3 message(s) moved
JMX JMS MBean
The JMX JMS MBean provides the attributes and operations to manipulate the JMS connection factories and JMS messages.
The object name to use is org.apache.karaf:type=jms,name=*
.
Attributes
The Connectionfactories
attribute provides the list of all JMS connection factories names.
Operations
-
create(name, type, url)
creates a JMS connection factory. -
delete(name)
deletes a JMS connection factory. -
Map<String, String> info(connectionFactory, username, password)
gets details about a JMS connection factory and broker. -
int count(connectionFactory, queue, username, password)
counts the number of pending messages on a JMS queue. -
List<String> queues(connectionFactory, username, password)
lists the JMS queues available on the JMS broker. -
List<String> topics(connectionFactory, username, password)
lists the JMS topics available on the JMS broker. -
TabularData browse(connectionFactory, queue, selector, username, password)
browses a JMS queue and provides a table of JMS messages. -
send(connectionFactory, queue, content, replyTo, username, password)
sends a JMS message to a target queue. -
int consume(connectionFactory, queue, selector, username, password)
consumes JMS messages from a JMS queue. -
int move(connectionFactory, source, destination, selector, username, password)
moves messages from a JMS queue to another.
4.16.6. Persistence (JPA)
Apache Karaf provides JPA persistence providers (such as Apache OpenJPA) to be easy to use (in a OSGi way) and provide container managed persistence for applications (using Blueprint).
Apache Karaf embeds Aries JPA, providing a very easy way to develop applications that use JPA persistence.
See the developer guide for details about developing applications that use JPA.
Persistence engine features
Apache Karaf provides a set of ready to use persistence engine features:
-
Apache OpenJPA. The
openjpa
feature installs thejpa
feature with the Apache OpenJPA as persistence engine:
karaf@root()> feature:install openjpa
-
Hibernate. The
hibernate
feature installs thejpa
feature with the Hibernate persistence engine:
karaf@root()> feature:install hibernate
-
EclipseLink. The
eclipselink
feature will be available in the next Apache Karaf release.
4.16.7. EJB
This section describes how to add support of EJB in Apache Karaf. It doesn’t describe how to develop EJB applications. See the developer guide for that.
Apache OpenEJB
Apache Karaf doesn’t provide "native" support of EJB (Enterprise Java Beans).
Apache OpenEJB provides EJB support for Apache Karaf by providing a set of features.
You have to update some Karaf configuration to have full OpenEJB support.
First, in the etc/system.properties
, you have to append the following properties:
... # # OpenEJB scanner # openejb.deployments.classpath.exclude=bundle:* openejb.deployments.classpath.filter.descriptors=true
Due to some OpenEJB version constraint, you also have to update the etc/jre.properties
by changing the version of
the javax.xml.namespace
package, and remove the version of the javax.annotation
package (provided by Geronimo
Annotation API spec bundle, used by OpenEJB):
... javax.annotation, \ javax.annotation.processing, \ ... javax.xml.namespace;version="1.0.0", \ ...
It enables the OpenEJB bundles scanning, looking for EJBs.
After starting/restart Karaf to take these changes, we can install the OpenEJB feature:
karaf@root()> feature:repo-add openejb
By default, the feature:repo-add openejb
command will install the latest OpenEJB version available.
You can specify a target version using the version
argument:
karaf@root()> feature:repo-add openejb 4.5.2
Now, you have a set of new OpenEJB features available in your Apache Karaf container:
karaf@root()> la ... openejb-core | 4.5.2 | | openejb-features | openejb-server | 4.5.2 | | openejb-features | openejb-cxf | 4.5.2 | | openejb-features | openejb-rest | 4.5.2 | | openejb-features | openejb-soap | 4.5.2 | | openejb-features |
You can add EJB support installing the openejb-core
feature:
karaf@root()> feature:install openejb-core
Apache KarafEE
A custom distribution of Apache Karaf embedding OpenEJB is available in the Apache TomEE project.
The name of this custom distribution is KarafEE: https://svn.apache.org/repos/asf/tomee/karafee/
However, this project is now "deprecated", and all resources from KarafEE will move directly in Apache Karaf soon.
4.16.8. CDI
This section described how to add support of CDI, and embed a CDI container in Apache Karaf. It doesn’t describe how to develop CDI applications. See the developer guide for that.
Pax CDI
Apache Karaf supports different CDI containers by using Pax CDI.
Pax CDI is pre-referenced in Apache Karaf. To register the Pax CDI features, you can do:
karaf@root()> feature:repo-add pax-cdi
This command will register the latest pax-cdi features.
You can see now a set of new CDI features available:
karaf@root()> feature:list|grep -i cdi pax-cdi | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Provide CDI support pax-cdi-1.1 | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Provide CDI 1.1 support pax-cdi-weld | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Weld CDI support pax-cdi-1.1-weld | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Weld CDI 1.1 support pax-cdi-openwebbeans | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | OpenWebBeans CDI support pax-cdi-web | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Web CDI support pax-cdi-1.1-web | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Web CDI 1.1 support pax-cdi-web-weld | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Weld Web CDI support pax-cdi-1.1-web-weld | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | Weld Web CDI 1.1 support pax-cdi-web-openwebbeans | 0.6.0 | | org.ops4j.pax.cdi-0.6.0 | OpenWebBeans Web CDI support pax-cdi-deltaspike-core | >0.5 | | org.ops4j.pax.cdi-0.6.0 | Apache Deltaspike core support pax-cdi-deltaspike-jpa | 0.5 | | org.ops4j.pax.cdi-0.6.0 | Apche Deltaspike jpa support
Note
|
Starting from Apache Karaf 3.0.1, the |
CDI Containers
Thanks to Pax CDI, Apache Karaf supports multiple CDI implementation versions, and different CDI containers.
You just have to install the feature corresponding to the CDI container and version that you want to use.
Apache OpenWebBeans
Apache Karaf provides a ready to use feature for Apache OpenWebBeans.
The openwebbeans
feature automatically install the Pax CDI features and the Apache OpenWebBeans bundles:
karaf@root()> feature:install openwebbeans
Note
|
With Apache Karaf 3.0.0, don’t forget to register the pax-cdi features repository first with: karaf@root()> feature:repo-add pax-cdi |
JBoss Weld CDI container
Apache Karaf provides a ready to use feature for JBoss Weld.
The weld
feature automatically install the Pax CDI features and the JBoss Weld bundles:
karaf@root()> feature:install weld
Note
|
With Apache Karaf 3.0.0, don’t forget to register the pax-cdi features repository first with: karaf@root()> feature:repo-add pax-cdi |
4.16.9. HA/failover and cluster
Apache Karaf natively provides a failover mechanism. It uses a kind of master/slave topology where one instance is active and the others are in standby.
If you are looking for cluster of Apache Karaf instances (active/active), Apache Karaf Cellar is a solution.
Karaf provides failover capability using either a simple lock file or a JDBC locking mechanism. In both cases, a container-level lock system allows bundles to be preloaded into the slave Karaf instance in order to provide faster failover performance.
HA/failover (active/passive)
The Apache Karaf failover capability uses a lock system.
This container-level lock system allows bundles installed on the master to be preloaded on the slave, in order to provide faster failover performance.
Two types of lock are supported:
-
filesystem lock
-
database lock
When a first instance starts, if the lock is available, it takes the lock and become the master. If a second instance starts, it tries to acquire the lock. As the lock is already hold by the master, the instance becomes a slave, in standby mode (not active). A slave periodically check if the lock has been released or not.
Filesystem lock
The Apache Karaf instances share a lock on the filesystem. It means that the filesystem storing the lock has to be accessible to the different instances (using SAN, NFS, …).
The configuration of the lock system has to be defined in the etc/system.properties
file, on each instance (master/slave):
karaf.lock=true karaf.lock.class=org.apache.karaf.main.SimpleFileLock karaf.lock.dir=<PathToLockFileDirectory> karaf.lock.delay=10000
-
karaf.lock
property enables the the HA/failover mechanism -
karaf.lock.class
property contains the class name providing the lock implementation. Here, we use the filesystem lock. -
karaf.lock.dir
property contains the location where the lock will be written. All instances have to share the same lock. -
karaf.lock.delay
property is the interval period (in milliseconds) to check if the lock has been released or not.
Database lock
It’s not always possible and easy to have a shared filesystem between multiple Apache Karaf instances.
Instead of sharing a filesystem, Apache Karaf supports sharing a database.
The master instance holds the lock by locking a table in the database. If the master loses the lock, a waiting slave gains access to the locking table, acquire the lock on the table and starts.
The database lock uses JDBC (Java DataBase Connectivity). To use database locking, you have to:
-
copy the JDBC driver in the
lib/ext
folder on each instance. The JDBC driver to use is the one corresponding to the database used for the locking system. -
update
etc/system.properties
file on each instance:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.DefaultJDBCLock karaf.lock.level=50 karaf.lock.delay=10000 karaf.lock.jdbc.url=jdbc:derby://dbserver:1527/sample karaf.lock.jdbc.driver=org.apache.derby.jdbc.ClientDriver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=30
-
karaf.lock
property enabled the HA/failover mechanism -
karaf.lock.class
property contains the class name providing the lock implementation. Theorg.apache.karaf.main.DefaultJDBCLock
is the most generic database lock system implementation. Apache Karaf supports lock system for specific databases (see later for details). -
karaf.lock.level
property is the container-level locking (see later for details). -
karaf.lock.delay
property is the interval period (in milliseconds) to check if the lock has been released or not. -
karaf.lock.jdbc.url
property contains the JDBC URL to the database (derby in this example). -
karaf.lock.jdbc.driver
property contains the class name of the JDBC driver to use (derby in this example). -
karaf.lock.jdbc.user
property contains the username to use to connect to the database. -
karaf.lock.jdbc.password
property contains the password to use to connet to the database. -
karaf.lock.jdbc.table
property contains the database table to use for the lock. Karaf will first try to find the table as specified in this property, and if not found, it will try the table name in lower and upper case.
Note
|
Apache Karaf won’t start if the JDBC driver is not present in the |
Note
|
The |
Note
|
If the connection to the database is lost, the master instance tries to gracefully shutdown, allowing a slave instance to become the master when the database is back. The former master instance will required a manual restart. |
Lock on Oracle
Apache Karaf supports Oracle database for locking. The lock implementation class name to use is org.apache.karaf.main.lock.OracleJDBCLock
:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.lock.OracleJDBCLock karaf.lock.jdbc.url=jdbc:oracle:thin:@hostname:1521:XE karaf.lock.jdbc.driver=oracle.jdbc.OracleDriver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=30
The Oracle JDBC driver file (ojdbc*.jar
) has to be copied in the lib/ext
folder.
Note
|
The |
Lock on Derby
Apache Karaf supports Apache Derby database for locking. The lock implementation class name to use is org.apache.karaf.main.lock.DerbyJDBCLock
:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.lock.DerbyJDBCLock karaf.lock.jdbc.url=jdbc:derby://127.0.0.1:1527/dbname karaf.lock.jdbc.driver=org.apache.derby.jdbc.ClientDriver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=30
The Derby JDBC driver file name has to be copied in the lib/ext
folder.
Lock on MySQL
Apache Karaf supports MySQL database for locking. The lock implementation class name to use is org.apache.karaf.main.lock.MySQLJDBCLock
:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.lock.MySQLJDBCLock karaf.lock.jdbc.url=jdbc:mysql://127.0.0.1:3306/dbname karaf.lock.jdbc.driver=com.mysql.jdbc.Driver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=30
The MySQL JDBC driver file name has to be copied in lib/ext
folder.
Lock on PostgreSQL
Apache Karaf supports PostgreSQL database for locking. The lock implementation class name to use is org.apache.karaf.main.lock.PostgreSQLJDBCLock
:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.lock.PostgreSQLJDBCLock karaf.lock.jdbc.url=jdbc:postgresql://127.0.0.1:1527/dbname karaf.lock.jdbc.driver=org.postgresql.Driver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=0
The PostgreSQL JDBC driver file has to be copied in the lib/ext
folder.
Lock on Microsoft SQLServer
Apache Karaf supports Microsoft SQLServer database for locking. The lock implementation class name to use is org.apache.karaf.main.lock.SQLServerJDBCLock
:
karaf.lock=true karaf.lock.class=org.apache.karaf.main.lock.SQLServerJDBCLock karaf.lock.level=50 karaf.lock.delay=10000 karaf.lock.jdbc.url=jdbc:jtds:sqlserver://127.0.0.1;databaseName=sample karaf.lock.jdbc.driver=net.sourceforge.jtds.jdbc.Driver karaf.lock.jdbc.user=user karaf.lock.jdbc.password=password karaf.lock.jdbc.table=KARAF_LOCK karaf.lock.jdbc.clustername=karaf karaf.lock.jdbc.timeout=30
The JTDS JDBC driver file has to be copied in the lib/ext
folder.
Container-level locking
Apache Karaf supports container-level locking. It allows bundles to be preloaded into the slave instance. Thanks to that, switching to a slave instance is very fast as the slave instance already contains all required bundles.
The container-level locking is supported in both filesystem and database lock mechanisms.
The container-level locking uses the karaf.lock.level
property:
karaf.lock.level=50
The karaf.lock.level
property tells the Karaf instance how far up the boot process to bring the OSGi container.
All bundles with an ID equals or lower to this start level will be started in that Karaf instance.
As reminder, the bundles start levels are specified in etc/startup.properties
, in the url=level
format.
Level | Behavior |
---|---|
1 |
A cold standby instance. Core bundles are not loaded into container. Slaves will wait until lock acquired to start server. |
<50 |
A hot standby instance. Core bundles are loaded into the container. Slaves will wait until lock acquired to start user level bundles. The console will be accessible for each slave instance at this level. |
>50 |
This setting is not recommended as user bundles will end up being started. |
Note
|
Using hot standby means that the slave instances are running and bind some ports. So, if you use master and slave instances on the same machine, you have to update the slave configuration to bind the services (ssh, JMX, etc) on different port numbers. |
Cluster (active/active)
Apache Karaf doesn’t natively support cluster. By cluster, we mean several active instances, synchronized with each other.
However, Apache Karaf Cellar can be installed to provide cluster support.
4.17. Monitoring and Management using JMX
Apache Karaf provides a complete JMX layer.
You can remotely connect to a running Apache Karaf instance using any JMX client (like jconsole).
The Apache Karaf features provide a set of MBeans, dedicating for the monitoring and management.
4.17.1. Connecting
Apache Karaf exposes a complete MBean server that you can use remotely.
The default port number is 1099.
The JMX URL to use by default is:
service:jmx:rmi:///jndi/rmi://localhost:1099/karaf-root
You have to provide an username and password to access to the JMX layer.
The JMX layer user the security framework, and so, by default, it uses the users defined in etc/users.properties
.
You can change the port numbers of the JMX layer in the etc/org.apache.karaf.management.cfg
configuration file.
4.17.2. Configuration
The Apache Karaf JMX management layer is configured in the etc/org.apache.karaf.management.cfg
configuration file:
################################################################################ # # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ################################################################################ # # The properties in this file define the configuration of Apache Karaf's JMX Management # # # Port number for RMI registry connection # rmiRegistryPort = 1099 # # Port number for RMI server connection # rmiServerPort = 44444 # # Name of the JAAS realm used for authentication # jmxRealm = karaf # # The service URL for the JMXConnectorServer # serviceUrl = service:jmx:rmi://0.0.0.0:${rmiServerPort}/jndi/rmi://0.0.0.0:${rmiRegistryPort}/karaf-${karaf.name} # # Whether any threads started for the JMXConnectorServer should be started as daemon threads # daemon = true # # Whether the JMXConnectorServer should be started in a separate thread # threaded = true # # The ObjectName used to register the JMXConnectorServer # objectName = connector:name=rmi
-
rmiRegistryPort
property contains the port number of the JMX RMI registry. Default is1099
. -
rmiServerPort
property contains the port number of the JMX RMI server. Default is44444
. -
jmxRealm
is the security realm to use as authentication backend. By default it uses thekaraf
realm.
4.17.3. MBeans
Apache Karaf provides a bunch of MBeans.
The MBeans object names have the same format:
org.apache.karaf:type=[feature],name=[instance]
Installing additional Apache Karaf features and external applications can provide new MBeans.
The following MBeans list is non exhaustive:
-
org.apache.karaf:type=bundle,name=*
: management of the OSGi bundles. -
org.apache.karaf:type=config,name=*
: management of the configurations. -
org.apache.karaf:type=diagnostic,name=*
: creation of dumps containing the current Apache Karaf activity (used for diagnostic). -
org.apache.karaf:type=feature,name=*
: management of the Apache Karaf features. -
org.apache.karaf:type=http,name=*
: management of the HTTP service (provided by thehttp
feature). -
org.apache.karaf:type=instance,name=*
: management of the instances. -
org.apache.karaf:type=jdbc,name=*
: management of the JDBC service (provided by thejdbc
feature). -
org.apache.karaf:type=jms,name=*
: management of the JMS service (provided by thejms
feature). -
org.apache.karaf:type=jndi,name=*
: management of the JNDI service (provided by thejndi
feature). -
org.apache.karaf:type=kar,name=*
: management of the KAR file. -
org.apache.karaf:type=log,name=*
: management of the log service. -
org.apache.karaf:type=obr,name=*
: management of the OBR service (provided by theobr
feature). -
org.apache.karaf:type=package,name=*
: details about packages exported/imported. -
org.apache.karaf:type=service,name=*
: management of the OSGi services. -
org.apache.karaf:type=system,name=*
: management of the Apache Karaf container itself (halt, restart, etc). -
org.apache.karaf:type=web,name=*
: management of WebApplications (provided by thewar
feature). -
org.apache.karaf:type=wrapper,name=*
: management of the service wrapper (provided by thewrapper
feature).
4.17.4. RBAC
Apache Karaf provides a complete Role-Based Access Control to the JMX MBeans and operations.
Whenever a JMX operation is invoked, the roles of the user are checked against the required roles for this operation.
The access lists are defined in configuration file in the etc
folder.
The relevant configuration is prefixed with jmx.acl
and based on the JMX ObjectName that it applies to.
For instance, specific configuration for a MBean with the object name foo.bar:type=Test
can be placed in the
etc/jmx.acl.foo.bar.Test.cfg
configuration file.
More generic configurations can be placed in the domain (e.g. jmx.acl.foo.bar.cfg) or at the top level (jmx.acl.cfg).
A simple configuration file looks like:
# operation = role test = admin getVal = manager, viewer
In this configuration, Apache Karaf looks for a:
-
Specific match for the invocation, e.g.
test(int)["17"] = role1
-
Regex match for the invocation, e.g.
test(int)[/[0-9]/] = role2
In both cases, the passed argument is converted to a String for the comparison. If any of the above match, the search stops and the associated roles are used. -
Signature match for the invocation, e.g.
test(int) = role3
If matched, the search stops and the associated roles are used. -
Method name match for the invocation, e.g.
test = role4
If matched, the search stops and the associated roles are used. -
A method name wildcard match, e.g.
te* = role5
For all the wildcard matches found in the current configuration file, the roles associated with the longest match are used. So if you have te* and * and the method invoked is test, then the roles defined with te* are used, not the ones defined with *.
If no matching definition is found, the most specific definition always takes the precedence.
You can find some configuration examples:
-
Only a
manager
can call GC on the Memory MBean:
# etc/jmx.acl.java.lang.Memory.cfg gc = manager
-
Bundles with ID between 0 and 49 can be stopped only by an
admin
, other bundles can be stopped by amanager
:
# etc/jmx.acl.org.apache.karaf.bundles.cfg stop(java.lang.String)[/([1-4])?([0-9]/] = admin stop = manager
The etc/jmx.acl.cfg
configuration file contains the global configuration for the invocation on any MBean that
doesn’t have a specific configuration:
# etc/jmx.acl.cfg list* = viewer get* = viewer is* = viewer set* = admin * = admin
By default, all "read-only" operations (list*
, get*
, is*
) can be performed by a viewer
, whereas the "read-write" operations can be performed only by an admin
.
The org.apache.karaf:type=security,area=jmx
MBean can be used to check whether the current user can access a certain MBean or invoke a specific operation on it.
This MBean can be used by management clients (monitoring tools, etc) to decide whether to show certain MBeans or operations to the end user.
4.17.5. JMX-HTTP bridge with Jolokia
It’s not always easy to use a JMX client with the RMI protocol.
Some monitoring tools (Nagios, Zabbix, …) are not native JMX clients.
But most of them can use HTTP.
More over, you may want to write your own application/web application. In that case, HTTP and JSON can be very interesting and easy to remotely manage Apache Karaf.
Jolokia can be installed in Apache Karaf as a remote JMX-HTTP bridge.
First, you have to install the http
feature:
karaf@root()> feature:install http
Now, you can install directly the Jolokia bundle:
karaf@root()> bundle:install -s mvn:org.jolokia/jolokia-osgi/1.1.5
By default, Jolokia is listening on the port 8181
(see the WebContainer (JSP/Servlet) page for details about the HTTP configuration).
If you point a browser on http://localhost:8181/jolokia you will see a JSON output like:
{"timestamp":1387552680,"status":200,"request":{"type":"version"},"value":{"protocol":"7.0","agent":"1.1.5","info":{"product":"felix","vendor":"Apache","version":"4.2.1"`}
You can manipulate the Apache Karaf JMX layer via HTTP and JSON, via system tools (like curl
, jmx4perl
, monitoring tools (supporting HTTP/JSON), or web applications.
For instance, you can send a JSON request to get details about the current Apache Karaf heap memory usage.
The format of the request is:
{ "type":"read", "mbean":"java.lang:type=Memory", "attribute":"HeapMemoryUsage", "path":"used" }
We can send this JSON request using curl
and get the result:
curl -d "{\"type\":\"read\",\"mbean\":\"java.lang:type=Memory\",\"attribute\":\"HeapMemoryUsage\",\"path\":\"used\"}" http://localhost:8080/jolokia/ && echo ""
You can find details on the Jolokia website and in the documentation.
4.18. Apache Karaf Decanter
Apache Karaf Decanter provides a complete monitoring solution including data history, turnkey dashboards, SLA and alerting support.
4.19. WebConsole
Apache Karaf provides an optional WebConsole.
This WebConsole provides a graphical web GUI to see and manage your Apache Karaf container.
You can use the WebConsole to:
-
manage Apache Karaf features
-
manage OSGi bundles
-
manage the instances
-
manage the confgurations
-
manage the log service
The WebConsole is extensible via a plugins system. Some applications can add new pages to the WebConsole. For instance, Apache Karaf Cellar provides additional pages to administrate cluster groups, nodes, etc.
4.19.1. Installation
To enable the Apache Karaf WebConsole, you just have to install the webconsole
feature:
karaf@root()> feature:install webconsole
The webconsole
feature automatically installs the http
feature (see the [WebContainer section|webcontainer] for details).
4.19.2. Access
The Apache Karaf WebConsole uses the WebContainer port number (see the [WebContainer section|webcontainer] for details)
with the /system/console
context.
By default, the Apache Karaf WebContainer port number is 8181
.
It means that the Apache Karaf WebConsole is accessible on the following URL: http://localhost:8181/system/console
As the Apache Karaf WebConsole uses the security framework, an username and password will be prompted.
You have to enter an username/password from the karaf
realm. By default, you can use karaf
/karaf
.
See the Security section for details.
Note
|
Only users with the |
4.20. Tuning
4.20.1. Garbage Collection
Like any Java applications, Apache Karaf uses a JVM. An important feature of the JVM is the Garbage Collector.
Apache Karaf default configuration is sized for small to medium needs and to work on most machine.
That’s why this default configuration may appear like "small".
By default, Apache Karaf uses:
-
-Xms128M
-
-Xmx512M
-
-XX:+UnlockDiagnosticVMOptions
-
-XX:+UnsyncloadClass
On Sun/Oracle JVM: * the Perm size is the JVM default
On IBM JVM and AIX system:
* -Xverify:none
* -Xdump:heap
* -Xlp
For any container, it’s always difficult to predict the usage of the resources and the behaviour of the artifacts deployed.
Generally speaking, a good approach for tuning is to enable -verbose:gc
and use tools like VisualVM to identify the potentials
memory leaks, and see the possible optimisation of the spaces and GC.
You can find introduction about GC here: http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/gc01/index.html
Java 6
If you have enough resources available on the machine, a good configuration may be:
-
-server
-
-Xmx1024M
-
-XX:MaxPermSize=640M
-
-XX:+UseConcMarkSweepGC
-
-XX:+UseParNewGC
-
-XX:+CMSClassUnloadingEnabled
It will give more resources to Apache Karaf, and avoid some perm space saturation if you do a lot of bundles refresh.
See http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html for details about Java 6 tuning.
Java 7
Java 7 introduces a new GC algorithm: the GC1.
Depending of the use cases (and usage of the heap), the new GC1 algorithm can give good performance improvements:
-
-XX:+UseG1GC
-
-XX:-UseAdaptiveSizePolicy
See http://docs.oracle.com/javase/7/docs/technotes/guides/vm/G1.html for details about Java 7 GC1 tuning.
You can find a good article about Java 7 tuning here: http://java-is-the-new-c.blogspot.de/2013/07/tuning-and-benchmarking-java-7s-garbage.html
4.20.2. Threads
In high loaded system, the number of threads can be very large.
WebContainer
If you use the Apache Karaf WebContainer, the Jetty connectors create threads to handle the incoming HTTP requests.
The etc/jetty.xml
configuration file allows you to tune the Jetty connector.
For instance, the following connector configuration:
<Call name="addConnector"> <Arg> <New class="org.eclipse.jetty.server.nio.SelectChannelConnector"> <Set name="host"> <Property name="jetty.host" /> </Set> <Set name="port"> <Property name="jetty.port" default="8181" /> </Set> <Set name="maxIdleTime">300000</Set> <Set name="Acceptors">2</Set> <Set name="statsOn">false</Set> <Set name="confidentialPort">8443</Set> <Set name="lowResourcesConnections">20000</Set> <Set name="lowResourcesMaxIdleTime">5000</Set> </New> </Arg> </Call>
defines the following properties:
-
maxIdleTime
is the maximum inactivity time for a connection. -
lowResourcesConnections
defines the number of connections. If the current number of connections is greater than this value, the status is "low on resources". In that case, a new connection timeout is applied: thelowResourceMaxIdleTime
. -
Acceptors
defines the number of threads for incoming connections.
Apache Camel
For instance, if you use Apache Camel inside Apache Karaf, Camel components can create a lot of threads.
Apache Camel use the notion of threadPoolProfile
to control the threads creation.
For instance, the following Camel configuration defines a pool creation strategy:
<threadPoolProfile id="defaultThreadPoolProfile" defaultProfile="true" poolSize="10" maxPoolSize="20" maxQueueSize="1000" rejectedPolicy="CallerRuns"/>
See the Apache Camel website for details.
Apache CXF
Apache CXF uses workqueues to handle server request/response.
You may see a etc/org.apache.cxf.workqueues-default.cfg
configuration file. It’s the default configuration applied
to all workqueues (a workqueue can be associated to a specific endpoint).
On a workqueue, you can define the following properties about the threads:
-
org.apache.cxf.workqueue.default.highWaterMark
defines the maximum number of threads. -
org.apache.cxf.workqueue.default.lowWaterMark
defines the minimum number of threads. -
org.apache.cxf.workqueue.default.initialSize
defines the initial number of threads.
See the Apache CXF website for details.
4.20.3. System packages
The etc/jre.properties
defines the packages directly provided by the JVM.
Most of the time, the default configuration in Apache Karaf is fine and works in most of the use cases.
However, some times, you may want to not use the packages provided by the JVM, but the same packages provided by a bundle.
For instance, the JAXB version provided by the JVM is "old", and you want to use new JAXB bundles.
In that case, you have to comment the packages in etc/jre.properties
to avoid to be provided by the JVM and use the
ones from the bundles.
5. Developer Guide
5.1. Developer commands
As you can see in the users guide, Apache Karaf is an enterprise ready OSGi container.
It’s also a container designed to simplify the life for developers and administrators to get details about the running container.
5.1.1. Dump
If you encounter issues like performance degradations, weird behaviour, it could be helpful to have a kind of snapshot about the current activity of the container.
The dev:dump-create
command creates a dump file containing:
-
the
bundles.txt
file contains the list of all OSGi bundles, with id, symbolic name, version, current status -
the
environment.txt
file contains details about Apache Karaf, OSGi framework, Operating System, JVM, system properties, threads count, classes loaded -
the
features.txt
file contains the list of Apache Karaf features repositories, features with version, current status, and bundles provided. -
the
threads.txt
file contains a thread dump, with all threads, waiting status, etc. -
the
log
folder contains thedata/log
folder, with all log files.
By default, the dev:dump-create
command creates a zip file in the KARAF_BASE
folder, with the timestamp of the
dump creation:
karaf@root()> dev:dump-create Diagnostic dump created.
We can see the file generated in the KARAF_BASE
folder:
$ cd /opt/apache-karaf-3.0.0 $ ls -lh *.zip -rw-r--r-- 1 user group 11K Dec 23 16:08 2013-12-23_160858.zip
You can specify the file name of the zip archive:
karaf@root()> dev:dump-create mydump.zip Diagnostic dump created.
Instead of a zip archive, you can create the dump (exploded) in a directory using the -d
(--directory
) option:
karaf@root()> dev:dump-create -d /tmp/mydump Diagnostic dump created.
5.1.2. Diagnostic
It’s not always easy for the developers to understand why a bundle is not active.
It could be because the Activator failed, the Blueprint container start failed, etc.
The bundle:diag
command gives you details about a bundle is not active:
karaf@root()> bundle:diag Apache ServiceMix :: Bundles :: avro-ipc (81) --------------------------------------------- Status: Installed Unsatisfied Requirements: [81.0] osgi.wiring.package; (&(osgi.wiring.package=javax.servlet)(version>=2.5.0)(!(version>=3.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=javax.servlet.http)(version>=2.5.0)(!(version>=3.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.data)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.file)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.generic)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.io)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.reflect)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.specific)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.apache.avro.util)(version>=1.7.0)(!(version>=2.0.0))) [81.0] osgi.wiring.package; (osgi.wiring.package=org.apache.velocity) [81.0] osgi.wiring.package; (osgi.wiring.package=org.apache.velocity.app) [81.0] osgi.wiring.package; (osgi.wiring.package=org.apache.velocity.context) [81.0] osgi.wiring.package; (osgi.wiring.package=org.apache.velocity.exception) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.bootstrap)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.buffer)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.channel)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.channel.group)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.channel.socket.nio)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.handler.codec.frame)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.handler.codec.oneone)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.jboss.netty.handler.execution)(version>=3.4.0)(!(version>=4.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.mortbay.jetty)(version>=6.1.0)(!(version>=7.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.mortbay.jetty.bio)(version>=6.1.0)(!(version>=7.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.mortbay.jetty.nio)(version>=6.1.0)(!(version>=7.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.mortbay.jetty.servlet)(version>=6.1.0)(!(version>=7.0.0))) [81.0] osgi.wiring.package; (&(osgi.wiring.package=org.mortbay.resource)(version>=6.1.0)(!(version>=7.0.0)))
5.1.3. Dynamic import
The bundle:dynamic-import
command allows you to enable or disable the dynamic import of a given bundle:
karaf@root()> bundle:dynamic-import 77 Enabling dynamic imports on bundle org.apache.karaf.config.core [77]
The purpose of dynamic import is to allow a bundle to be wired up to packages that may not be knwon about in advance. When a class is requested, if it cannot be solved via the bundle’s existing imports, the dynamic import allows other bundles to be considered for a wiring import to be added.
The bundle:dynamic-import
command allows or doesn’t allow this behaviour.
5.1.4. OSGi framework
The system:framework
command allows to display the current OSGi framework in use, and enable/disable debugging inside the OSGi framework.
karaf@root()> system:framework Current OSGi framework is felix karaf@root()> system:framework -debug Enabling debug for OSGi framework (felix) karaf@root()> system:framework -nodebug Disabling debug for OSGi framework (felix)
5.1.5. Stack traces printout
The shell:stack-traces-print
command prints the full stack trace when the execution of a command
throws an exception.
You can enable or disable this behaviour by passing true (to enable) or false (to disable) on the command on the fly:
karaf@root()> stack-traces-print Printing of stacktraces set to true karaf@root()> bundle:start java.lang.RuntimeException: Access to system bundle 0 denied. You can override with -f at org.apache.karaf.bundle.command.BundlesCommand.assertNoSystemBundles(BundlesCommand.java:57) at org.apache.karaf.bundle.command.BundlesCommand.doExecute(BundlesCommand.java:48) at org.apache.karaf.bundle.command.BundlesCommandWithConfirmation.doExecute(BundlesCommandWithConfirmation.java:41) at org.apache.karaf.shell.console.AbstractAction.execute(AbstractAction.java:33) at org.apache.karaf.shell.console.OsgiCommandSupport.execute(OsgiCommandSupport.java:39) at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:33) at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.aries.proxy.impl.ProxyHandler$1.invoke(ProxyHandler.java:54) at org.apache.aries.proxy.impl.ProxyHandler.invoke(ProxyHandler.java:119) at org.apache.karaf.shell.console.commands.$BlueprintCommand14083304.execute(Unknown Source) at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.aries.proxy.impl.ProxyHandler$1.invoke(ProxyHandler.java:54) at org.apache.aries.proxy.impl.ProxyHandler.invoke(ProxyHandler.java:119) at org.apache.karaf.shell.console.commands.$BlueprintCommand14083304.execute(Unknown Source) at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78) at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:477) at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:403) at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108) at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183) at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120) at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:89) at org.apache.karaf.shell.console.impl.jline.ConsoleImpl$DelegateSession.execute(ConsoleImpl.java:497) at org.apache.karaf.shell.console.impl.jline.ConsoleImpl.run(ConsoleImpl.java:198) at java.lang.Thread.run(Thread.java:722) at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3.doRun(ConsoleFactoryService.java:118) at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3$1.run(ConsoleFactoryService.java:109) at java.security.AccessController.doPrivileged(Native Method) at org.apache.karaf.jaas.modules.JaasHelper.doAs(JaasHelper.java:47) at org.apache.karaf.shell.console.impl.jline.ConsoleFactoryService$3.run(ConsoleFactoryService.java:107) karaf@root()> stack-traces-print false Printing of stacktraces set to false karaf@root()> bundle:start Error executing command: Access to system bundle 0 denied. You can override with -f
5.1.6. Bundle tree
The bundle:tree-show
command shows the bundle dependency tree based on the wiring information of a given single bundle
ID.
karaf@root()> bundle:tree-show 40 Bundle org.ops4j.pax.url.wrap [40] is currently ACTIVE org.ops4j.pax.url.wrap [40] +- org.ops4j.base.util.property [14] +- org.ops4j.pax.url.commons [49] | +- org.ops4j.base.util.property [14] | +- org.ops4j.pax.logging.pax-logging-api [23] | +- org.ops4j.pax.swissbox.property [31] | | +- org.ops4j.base.util.property [14] | | +- org.ops4j.base.lang [41] | +- org.apache.felix.configadmin [43] | | +- org.ops4j.pax.logging.pax-logging-api [23] | +- org.ops4j.base.lang [41] +- org.ops4j.pax.logging.pax-logging-api [23] +- org.ops4j.pax.swissbox.bnd [25] | +- biz.aQute.bndlib [30] | | +- org.apache.servicemix.bundles.junit [36] | +- org.ops4j.pax.logging.pax-logging-api [23] | +- org.ops4j.base.lang [41] +- org.apache.felix.configadmin [43] +- org.ops4j.base.net [29] | +- org.ops4j.base.monitors [37] | +- org.ops4j.base.lang [41] +- org.ops4j.base.lang [41]
5.1.7. Watch
The bundle:watch
command enables watching the local Maven repository for updates on bundles.
If the bundle file changes on the Maven repository, Apache Karaf will automatically update the bundle.
The bundle:watch
allows you to configure a set of URLs to monitore. All bundles bundles whose location matches the
given URL will be automatically updated. It avoids needing to manually update the bundles or even copy the bundle to the
system folder.
Note
|
Only Maven based URLs and Maven SNAPSHOTs will actually be updated automatically. |
The following command:
karaf@root> dev:watch *
will monitore all bundles that have a location matching mvn:* and having -SNAPSHOT in their URL.
5.2. Scripting
In the console section of the users guide, we introduced the scripting support.
5.2.1. Assignation
You already know the first usage of scripting: execution of command.
karaf@root()> echo hello world hello world
You can also assign value to session variables:
karaf@root()> msg = "hello world" hello world
Once you have assigned a value to a variable, you can display this value using the "resolved" variable name:
karaf@root()> echo $msg hello world
The () are execution quotes (like the backquotes when you use bash on Unix).
karaf@root()> ($.context bundle 1) location mvn:org.apache.karaf.jaas/org.apache.karaf.jaas.modules/3.0.1-SNAPSHOT
The $.context
access the context variables in the current session.
We access to the bundle
variable (an array containing all bundles), and we want to display the bundle location for
the bundle at the index 1 in the bundle array.
5.2.2. List, maps, pipes and closures
Using [], you can define array variable:
karaf@root()> list = [1 2 a b] 1 2 a b
You can also create a map if you put variables assignation in the array:
karaf@root()> map = [Jan=1 Feb=2 Mar=3] Jan 1 Feb 2 Mar 3
Using the | character, you can pipe output from a command as an input to another one.
For instance, you can access to the bundles context variables and send it as input to the grep command:
karaf@root()> ($.context bundles) | grep -i felix 0|Active | 0|org.apache.felix.framework (4.2.1) 21|Active | 11|org.apache.felix.fileinstall (3.2.6) 43|Active | 10|org.apache.felix.configadmin (1.6.0) 51|Active | 30|org.apache.felix.gogo.runtime (0.10.0)
You can assign name to script execution. It’s what we use for alias:
karaf@root()> echo2 = { echo xxx $args yyy } echo xxx $args yyy karaf@root()> echo2 hello world xxx hello world yyy
5.2.3. Startup
The etc/shell.init.script
file is executed at startup in each shell session, allowing the definition of additional
variables or aliases or even complex functions. It’s like the bashrc or profile on Unix.
5.2.4. Constants and variables
Apache Karaf console provides a set of implicit constants and variables that you can use in your script.
-
$.context
to access a bundle context -
$.variables
to access the list of defined variables -
$.commands
to access the list of defined commands
The variables starting with a # that are defined as Function (such as closures) will be executed automatically:
karaf@root> \#inc = { var = "${var}i" ; $var } var = "${var}i" ; $var karaf@root> echo $inc i karaf@root> echo $inc ii karaf@root>
5.2.5. Built-in variables and commands
Apache Karaf console provides built-in variable very useful for scripting:
-
$args
retrieves the list of script parameters, given to the closure being executed -
$1 .. $999
retrieves the nth argument of the closure -
$it
(same as$1
) is used in a loop to access the current iterator value
Apache Karaf console provides commands for scripting:
-
shell:if
-
shell:new
-
shell:each
-
…
5.2.6. Leveraging existing Java capabilities (via reflection)
Apache Karaf console supports loading and execution of Java classes.
The $karaf.lastException
implicit variable contains the latest Exception thrown.
karaf@root()> ($.context bundle) loadClass foo Error executing command: foo not found by org.apache.karaf.shell.console [17] karaf@root()> $karaf.lastException printStackTrace java.lang.ClassNotFoundException: foo not found by org.apache.karaf.shell.console [17] at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1460) at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:72) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1843) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1723) at org.apache.felix.framework.BundleImpl.loadClass(BundleImpl.java:926) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.felix.gogo.runtime.Reflective.invoke(Reflective.java:137) at org.apache.felix.gogo.runtime.Closure.executeMethod(Closure.java:527) at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:403) at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108) at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183) at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120) at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:89) at org.apache.karaf.shell.console.jline.Console.run(Console.java:166) at java.lang.Thread.run(Thread.java:680)
It’s possible to create objects to create commands "on the fly":
karaf@root()> addcommand system (($.context bundle) loadClass java.lang.System) karaf@root()> system:getproperty karaf.name root
It means that you can create object using the new
directive, and call methods on the objects:
karaf@root> map = (new java.util.HashMap) karaf@root> $map put 0 0 karaf@root> $map 0 0
5.2.7. Examples
The following examples show some scripts defined in etc/shell.init.script
.
The first example show a script to add a value into a configuration list:
# # Add a value at the end of a property in the given OSGi configuration # # For example: # > config-add-to-list org.ops4j.pax.url.mvn org.ops4j.pax.url.mvn.repositories http://scala-tools.org/repo-releases # config-add-to-list = { config:edit $1 ; a = (config:property-list | grep --color never $2 | tac) ; b = (echo $a | grep --color never "\b$3\b" | tac) ; if { ($b trim) isEmpty } { if { $a isEmpty } { config:property-set $2 $3 } { config:property-append $2 ", $3" } ; config:update } { config:cancel } }
This second example shows a script to wait for an OSGi service, up to a given timeout, and combine this script in other scripts:
# # Wait for the given OSGi service to be available # wait-for-service-timeout = { _filter = $.context createFilter $1 ; _tracker = shell:new org.osgi.util.tracker.ServiceTracker $.context $_filter null ; $_tracker open ; _service = $_tracker waitForService $2 ; $_tracker close } # # Wait for the given OSGi service to be available with a timeout of 10 seconds # wait-for-service = { wait-for-service-timeout $1 10000 } # # Wait for the given command to be available with a timeout of 10 seconds # For example: # > wait-for-command dev watch # wait-for-command = { wait-for-service "(&(objectClass=org.apache.felix.service.command.Function)(osgi.command.scope=$1)(osgi.command.function=$2))" }
5.3. Programmatically connect
As described in the users guide, Apache Karaf supports remote access to both the console (by embedding a SSHd server) and the management layer.
5.3.1. To the console
You can write a Apache Karaf remote console client in Java (or other language).
Accessing to a remote Apache Karaf console means writing a SSH client. This SSH client can be in pure Java or in another language.
For instance, the bin/client
script starts a SSH client written in Java.
The following code is a simple code to create a SSH client:
import org.apache.sshd.ClientChannel; import org.apache.sshd.ClientSession; import org.apache.sshd.SshClient; import org.apache.sshd.client.future.ConnectFuture; public class Main { public static void main(String[] args) throws Exception { String host = "localhost"; int port = 8101; String user = "karaf"; String password = "karaf"; SshClient client = null; try { client = SshClient.setUpDefaultClient(); client.start(); ConnectFuture future = client.connect(host, port); future.await(); ClientSession session = future.getSession(); session.authPassword(user, password); ClientChannel channel = session.createChannel("shell"); channel.setIn(System.in); channel.setOut(System.out); channel.setErr(System.err); channel.open(); channel.waitFor(ClientChannel.CLOSED, 0); } catch (Throwable t) { t.printStackTrace(); System.exit(1); } finally { try { client.stop(); } catch (Throwable t) { } } System.exit(0); } }
5.3.2. To the management layer
The Apache Karaf management layer uses JMX. Apache Karaf embeds a JMX MBeanServer that you can use remotely.
In order to use the MBeanServer remotely, you have to write a JMX client.
The following example shows a simple JMX client stopping Apache Karaf remotely via the JMX layer:
javax.management.*; public class Main { public static void main(String[] args) throws Exception { JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:1099/karaf-root"); JMXConnector connector = JMXConnectorFactory.connect(url, null); MBeanServerConnection mbeanServer = connector.getMBeanServerConnection(); ObjectName systemMBean = new ObjectName("org.apache.karaf:type=system,name=karaf-root"); mbeanServer.invoke(systemMBean, "halt", null, null); connector.close(); } }
5.4. Branding
5.4.1. Console
You can "brand" the Apache Karaf console.
By branding, it means that you can define your own:
-
the welcome message (motd or Message Of The Day) displayed when you start the console
-
the prompt displayed to the users
There are 2 ways of branding the Karaf console: (1) adding a branding.properties file to etc, and (2) creating a branding bundle.
5.4.2. Adding a branding.properties file to etc
Create a etc/branding.properties
file similar to:
code
welcome = \
\u001B[36m _ \u001B[0m\r\n\
\u001B[36m / /// / / \u001B[0m\r\n\
\u001B[36m / ,< / `/ / `/ /_ \u001B[0m\r\n\
\u001B[36m / /| |/ // / / / // / / \u001B[0m\r\n\
\u001B[36m // ||__,_// \\_,// \u001B[0m\r\n\
\r\n\
\u001B[1m Apache Karaf\u001B[0m (${project.version})\r\n\
\r\n\
Hit \u001B[1m<tab>\u001B[0m for a list of available commands\r\n\
and \u001B[1m[cmd] --help\u001B[0m for help on a specific command.\r\n\
Hit \u001B[1m<ctrl-d>\u001B[0m or \u001B[1mosgi:shutdown\u001B[0m to shutdown Karaf.\r\n
prompt = \u001B[1m${USER}@${APPLICATION}\u001B[0m>
code
Start Karaf and you will see your branded Karaf console.
5.4.3. Branding bundle
At startup, Apache Karaf is looking for a bundle which exports the org.apache.karaf.branding
package, containing
a branding.properties
file.
Basically, a branding bundle is a very simple bundle, just containing a org/apache/karaf/branding/branding.properties
file.
It’s easy to create such branding bundle using Apache Maven.
The following pom.xml
creates a branding bundle:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>your.group.id</groupId> <artifactId>your.branding.artifact.id</artifactId> <version>1.0-SNAPSHOT</version> <packaging>bundle</packaging> <name>Your Branding Bundle Name</name> <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <version>2.4.0</version> <extensions>true</extensions> <configuration> <instructions> <Bundle-SymbolicName>${project.artifactId}</bundle-SymbolicName> <Import-Package>*</Import-Package> <Private-Package>!*</Private-Package> <Export-Package> org.apache.karaf.branding </Export-Package> <Spring-Context>*;public-context:=false</Spring-Context> </instructions> </configuration> </plugin> </plugins> </build> </project>
You can put your branding.properties
file in the project resources (src/main/resources/org/apache/karaf/branding/branding.properties
):
welcome = This is my Karaf brand\r\n prompt = Hey ${USER}>
For instance, the default Apache Karaf branding properties file contains:
welcome = \ \u001B[36m __ __ ____ \u001B[0m\r\n\ \u001B[36m / //_/____ __________ _/ __/ \u001B[0m\r\n\ \u001B[36m / ,< / __ `/ ___/ __ `/ /_ \u001B[0m\r\n\ \u001B[36m / /| |/ /_/ / / / /_/ / __/ \u001B[0m\r\n\ \u001B[36m /_/ |_|\\__,_/_/ \\__,_/_/ \u001B[0m\r\n\ \r\n\ \u001B[1m Apache Karaf\u001B[0m (${project.version})\r\n\ \r\n\ Hit '\u001B[1m<tab>\u001B[0m' for a list of available commands\r\n\ and '\u001B[1m[cmd] --help\u001B[0m' for help on a specific command.\r\n\ Hit '\u001B[1m<ctrl-d>\u001B[0m' or type '\u001B[1msystem:shutdown\u001B[0m' or '\u001B[1mlogout\u001B[0m' to shutdown Karaf.\r\n
As you can see, the branding.properties
contains two properties:
* welcome is the welcome message displayed when you start Apache Karaf console.
* prompt is the string used to display the console prompt. This string supports variables:
${USER` defines the user name of the prompt. Caveat — the user name is presently static and hardcoded to "karaf",
however you can override here with your own static user name.
$APPLICATION
defines the Karaf instance name.
As you can see, both strings support ASCII escaped format. For instance \u001B[1m switches the foreground in bold and \u001B[0m switch back to normal.
Some examples of customized prompt examples follow:
# Define a user with fancy colors prompt = \u001B[36mmy-karaf-user\u001B[0m\u001B[1m@\u001B[0m\u001B[34m${APPLICATION}\u001B[0m>
# Static sober prompt prompt = my-user@my-karaf>
5.4.4. Installing the branding bundle
Thanks to the pom.xml
, we can use mvn
to build the branding bundle:
mvn install
You just have to drop the file in the lib
directory:
cp branding.jar /opt/apache-karaf-3.0.0/lib/karaf-branding.jar
You can now start Apache Karaf to see your branded console.
5.4.5. WebConsole
It’s also possible to brand the Apache Karaf WebConsole.
You have to create a bundle, fragment of the Apache Karaf WebConsole.
This WebConsole branding bundle contains a META-INF/webconsole.properties
containing branding properties:
# # This file contains branding properties to overwrite the default # branding of the Apache Felix Web Console when deployed in an # Apache Karaf application. webconsole.brand.name = My Web Console webconsole.product.name = My Karaf webconsole.product.url = http://karaf.apache.org/ webconsole.product.image = /res/karaf/imgs/logo.png webconsole.vendor.name = The Apache Software Foundation webconsole.vendor.url = http://www.apache.org webconsole.vendor.image = /res/karaf/imgs/logo.png webconsole.favicon = /res/karaf/imgs/favicon.ico webconsole.stylesheet = /res/karaf/ui/webconsole.css
The bundle also provides the css stylesheet and images defined in this properties file.
As for console, you can use the following pom.xml
to create the WebConsole branding bundle:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>my.group.id</groupId> <artifactId>branding</artifactId> <packaging>bundle</packaging> <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <version>2.4.0</version> <extensions>true</extensions> <configuration> <instructions> <Bundle-DocURL>http://felix.apache.org/site/apache-karaf.html</Bundle-DocURL> <Fragment-Host>org.apache.karaf.webconsole.console;bundle-version="[3,4)"</Fragment-Host> <Export-Package>!*</Export-Package> <Import-Package> javax.servlet;version=2.4, javax.servlet.http;version=2.4, !org.apache.felix.webconsole*, org.apache.aries.blueprint, org.osgi.service.blueprint.container, org.osgi.service.blueprint.reflect, * </Import-Package> </instructions> </configuration> </plugin> </plugins> </build> </project>
With the webconsole
feature installed, you can install this bundle (using bundle:install
or by editing the
etc/startup.properties
), you will see the WebConsole with your branding.
5.5. Extending
Apache Karaf is a very flexible container that you can extend very easily.
5.5.1. Console
In this section, you will see how to extend the console by adding your own command.
We will leverage Apache Maven to create and build the OSGi bundle. This OSGi bundle will use Blueprint. We don’t cover the details of OSGi bundle and Blueprint, see the specific sections for details.
Create the Maven project
To create the Maven project, we can:
-
use a Maven archetype
-
create by hand
Using archetype
The Maven Quickstart archetype can create an empty Maven project where you can put your project definition.
You can directly use:
mvn archetype:create \ -DarchetypeArtifactId=maven-archetype-quickstart \ -DgroupId=org.apache.karaf.shell.samples \ -DartifactId=shell-sample-commands \ -Dversion=1.0-SNAPSHOT
It results to a ready to use project, including a pom.xml
.
You can also use Maven archetype in interactive mode. You will have to answer to some questions used to generate
the project with the pom.xml
:
mvn archetype:generate Choose a number: (1/2/3/4/5/6/7/.../32/33/34/35/36) 15: : 15 Define value for groupId: : org.apache.karaf.shell.samples Define value for artifactId: : shell-sample-commands Define value for version: 1.0-SNAPSHOT: : Define value for package: : org.apache.karaf.shell.samples
By hand
Alternatively, you can simply create the directory shell-sample-commands
and create the pom.xml
file inside it:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.apache.karaf.shell.samples</groupId> <artifactId>shell-sample-commands<artifactId> <packaging>bundle</packaging> <version>1.0-SNAPSHOT</version> <name>shell-sample-commmands</name> <dependencies> <dependency> <groupId>org.apache.karaf.shell</groupId> <artifactId>org.apache.karaf.shell.console</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <version>${felix.plugin.version}</version> <configuration> <instructions> <Import-Package> org.apache.felix.service.command, org.apache.karaf.shell.commands, org.apache.karaf.shell.console, * </Import-Package> </instructions> </configuration> </plugin> </plugins> </build> </project>
Configuring for Java 6/7
We are using annotations to define commands, so we need to ensure Maven will actually use JDK 1.6 or 1.7 to compile the jar.
Just add the following snippet after the dependencies
section.
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <target>1.6</target> <source>1.6</source> </configuration> </plugin> </plugins> </build>
Loading the project in your IDE
We can use Maven to generate the needed files for your IDE:
Inside the project, run the following command
mvn eclipse:eclipse
or
mvn idea:idea
The project files for your IDE should now be created. Just open the IDE and load the project.
Creating a basic command class
We can now create the command class HelloShellCommand.java
package org.apache.karaf.shell.samples; import Command; import org.apache.karaf.shell.console.OsgiCommandSupport; @Command(scope = "test", name = "hello", description="Says hello") public class HelloShellCommand extends OsgiCommandSupport { @Override protected Object doExecute() throws Exception { System.out.println("Executing Hello command"); return null; } }
Blueprint definition
Blueprint is an injection framework for OSGi. It allows you to declare beans in a XML file and contains specific statement for OSGi services.
For the command, we use Blueprint to create the command bean and register as an OSGi service.
The blueprint definition file is located in the OSGI-INF/blueprint
folder of our bundle.
If you don’t have the src/main/resources
directory yet, create it.
mkdir src/main/resources
Then, re-generate the IDE project files and reload it so that this folder is now recognized as a source folder.
Inside this directory, create the OSGI-INF/blueprint/
directory and put the following file inside (the name of this file has no impact at all):
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0"> <command> <action class="org.apache.karaf.shell.samples.HelloShellCommand"/> </command> </command-bundle> </blueprint>
Compile
Let’s try to build the jar. Remove the test classes and sample classes if you used the artifact, then from the command line, run:
mvn install
The end of the maven output should look like:
[INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESSFUL [INFO] ------------------------------------------------------------------------
Test
Launch Apache Karaf and install your bundle:
karaf@root()> bundle:install -s mvn:org.apache.karaf.shell.samples/shell-sample-commands/1.0-SNAPSHOT
Let’s try running the command:
karaf@root()> test:hello Executing Hello command
Command completer
A completer allows you to automatically complete a command argument using <tab>. A completer is simply a bean which is injected to a command.
Of course to be able to complete it, the command should require an argument.
Command argument
We add an argument to the HelloCommand:
package org.apache.karaf.shell.samples; import Command; import Argument; import org.apache.karaf.shell.console.OsgiCommandSupport; @Command(scope = "test", name = "hello", description="Says hello") public class HelloShellCommand extends OsgiCommandSupport { @Argument(index = 0, name = "name", description = "The name that sends the greet.", required = true, multiValued = false) String name = null; @Override protected Object doExecute() throws Exception { System.out.println("Hello " + name); return null; } }
The Blueprint configuration file is the same as previously.
Completer bean
A completer is a bean which implements the Completer interface:
package org.apache.karaf.shell.samples; import org.apache.karaf.shell.console.completer.StringsCompleter; import org.apache.karaf.shell.console.Completer; /** * <p> * A very simple completer. * </p> */ public class SimpleNameCompleter implements Completer { /** * @param buffer the beginning string typed by the user * @param cursor the position of the cursor * @param candidates the list of completions proposed to the user */ public int complete(String buffer, int cursor, List candidates) { StringsCompleter delegate = new StringsCompleter(); delegate.getStrings().add("Mike"); delegate.getStrings().add("Eric"); delegate.getStrings().add("Jenny"); return delegate.complete(buffer, cursor, candidates); } }
Blueprint with completer
Using Blueprint, you can "inject" the completer linked to your command. The same completer could be used for several commands and a command can have several completers:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0"> <command> <action class="org.apache.karaf.shell.samples.HelloShellCommand"/> <completers> <ref component-id="simpleNameCompleter"/> <null/> </completers> </command> </command-bundle> <bean id="simpleNameCompleter" class="org.apache.karaf.shell.samples.SimpleNameCompleter"/> </blueprint>
You can have multiple completers for a single class, each matching a command argument. The order of the completers must match the order of the arguments, in order to have the desirable results.
Completers for option values
Quite often your commands will not have just arguments, but also options. You can provide completers for option values. The snippet below shows the HelloShellCommand with an option to specify what the greet message will be.
package org.apache.karaf.shell.samples; import Command; import Argument; import org.apache.karaf.shell.console.OsgiCommandSupport; @Command(scope = "test", name = "hello", description="Says hello") public class HelloShellCommand extends OsgiCommandSupport { @Argument(index = 0, name = "name", description = "The name that sends the greet.", required = true, multiValued = false) String name = null; @Option(name = "-g", aliases = "--greet", description = "The configuration pid", required = false, multiValued = false) String greet = "Hello; @Override protected Object doExecute() throws Exception { System.out.println(greet + " " + name); return null; } }
We can now specify a completer for the greet option. All that is required is to add an optional-completer element in the blueprint configuration that will associate a completer with the -g option or its --greet alias.
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"> <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0"> <command> <action class="org.apache.karaf.shell.samples.HelloShellCommand"/> <completers> <ref component-id="simpleNameCompleter"/> <null/> </completers> <optional-completers> <entry key="-g" value-ref="greetCompleter"/> </optional-completers> </command> </command-bundle> <bean id="simpleNameCompleter" class="org.apache.karaf.shell.samples.SimpleNameCompleter"/> <bean id="greetCompleter" class="org.apache.karaf.shell.samples.GreetCompleter"/> </blueprint>
Completers with state
Some times we want to tune the behavior of the completer depending on the commands already executed, in the current shell or even the rest of the arguments that have been already passed to the command. Such example is the config:set-property command which will provide auto completion for only for the properties of the pid specified by a previously issued config:edit command or by the option --pid.
This is done by accessing the CommandSession object which holds the state of the console. To get access to the CommandSession:
CommandSession session = CommandSessionHolder.getSession();
CommandSession provides map like methods for storing key/value pairs and can be used to put/get the state.
If you want to get access to the list of arguments that is already passed to the command, you can simply:
ArgumentCompleter.ArgumentList list = (ArgumentCompleter.ArgumentList) commandSession.get(ArgumentCompleter.ARGUMENTS_LIST);
Test
Launch a Karaf instance and run the following command to install the newly created bundle:
karaf@root()> bundle:install -s mvn:org.apache.karaf.shell.samples/shell-sample-commands/1.0-SNAPSHOT
Let’s try running the command:
karaf@root> test:hello <tab> one two three
5.5.2. WebConsole
You can also extend the Apache Karaf WebConsole by providing and installing a webconsole plugin.o
A plugin is an OSGi bundle that register a Servlet as an OSGi service with some webconsole properties.
5.6. Using the karaf-maven-plugin
The Karaf Maven plugin allows you:
-
to work with Karaf features: validate a features descriptor, add features bundle into a repository, create a KAR archive from a features descriptor, etc.
-
to create Karaf commands help: it generates help from Karaf commands
-
to modify Karaf instances and create distributions
5.6.1. Packagings
The most generally useful features of the karaf-maven-plugin are exposed as packagings. To use the packagings the pom or an ancestor must configure the karaf-maven-plugin with extensions:
<build> <pluginManagement> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <extensions>true</extensions> </plugin> </plugins> </pluginManagement> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> </plugin> </plugins> </build>
Then specify the packaging in your project as usual, e.g.
<packaging>kar</packaging>
Packaging | Description |
---|---|
|
The feature packaging generates a features.xml descriptor using the |
|
The kar packaging generates a features.xml descriptor using the |
|
Assembles a Karaf server based on the features descriptors and kar files listed as Maven dependencies |
5.6.2. Commands goals
The karaf-maven-plugin
is able to generate documentation for Karaf commands.
karaf:commands-generate-help
The karaf:commands-generate-help
goal generates documentation containing Karaf commands help.
It looks for Karaf commands in the current project class loader and generates the help as displayed with the --help option in the Karaf shell console.
Example
The example below generates help for the commands in the current project:
<project> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <executions> <execution> <id>document-commands</id> <phase>generate-resources</phase> <goals> <goal>commands-generate-help</goal> </goals> <configuration> <targetFolder>${project.build.directory}/docbook/sources</targetFolder> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
Parameters
Name | Type | Description |
---|---|---|
|
|
The directory where the documentation output files are to be generated. Default value: ${project.build.directory}/docbkx/sources |
|
|
The output format (docbx, asciidoc, or conf) of the commands documentation. Default value: docbx |
|
|
The class loader to use in loading the commands. Default value: ${project} |
5.6.3. Features goals
Normally you should use the features or kar packagings instead of these individual goals.
The karaf-maven-plugin
provides several goals to help you create and validate features XML descriptors as well as leverage your features to create a custom Karaf distribution.
karaf:features-generate-description
Except in unusual circumstances, use the <packaging>feature</packaging>
to run this goal.
The karaf:features-generate-descriptor
goal generates a features XML file based on the Maven dependencies.
By default, it will follow Maven transitive dependencies, stopping when it encounters bundles already present in features that are Maven dependencies.
A record of the dependency tree search can be found in target/history/treeListing.txt.
You can track dependency changes and warn or fail on change.
Configuration
Specify the packaging as a top level element
<packaging>feature</packaging>
You can supply a feature descriptor to extend in src/main/feature/feature.xml
.
Parameter Name | Type | Description |
---|---|---|
aggregateFeatures |
boolean (false) |
Specifies processing of feature repositories that are (transitive) Maven dependencies. If false, all features in these repositories become dependencies of the generated feature. If true, all features in these repositories are copied into the generated feature repository. |
startLevel |
int |
The start level for the bundles determined from Maven dependencies. This can be overridden by specifying the bundle in the source feature.xml with the desired startlevel. |
includeTransitiveDependency |
boolean (true) |
Whether to follow Maven transitive dependencies. |
checkDependencyChange |
boolean (false) |
Whether to record dependencies in |
warnOnDependencyChange |
boolean (false) |
whether to fail on changed dependencies (false, default) or warn in the build output (true). |
logDependencyChanges |
boolean (false) |
If true, added and removed dependencies are shown in target/history. |
overwriteChangedDependencies |
boolean (false) |
If true, the |
Example
<project> ... <packaging>feature</packaging> <dependencies> <dependency> <groupId>org.apache</groupId> <artifactId>bundle1</artifactId> <version>1.0</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <extensions>true</extensions> <configuration> <startLevel>80</startLevel> <aggregateFeatures>true</aggregateFeatures> </configuration> </plugin> </plugins> </build> </project>
karaf:features-validate-description
The karaf:features-validate-descriptor
goal validates a features XML descriptor by checking if all the required imports
for the bundles defined in the features can be matched to a provided export.
By default, the plugin tries to add the Karaf core features (standard and enterprise) in the repositories set. It means that it’s not required to explicitly define the Karaf features descriptor in the repository section of your features descriptor.
Example
The example below validates the features defined in the target/features.xml
by checking all the imports and exports.
It reads the definition for the packages that are exported by the system bundle from the src/main/resources/config.properties
file.
<project> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <executions> <execution> <id>validate</id> <phase>process-resources</phase> <goals> <goal>features-validate-descriptor</goal> </goals> <configuration> <file>target/features.xml</file> <karafConfig>src/main/resources/config.properties</karafConfig> </configuration> </execution> </executions> <dependencies> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <version>1.4.3</version> </dependency> </dependencies> </plugin> </plugins> </build> </project>
Parameters
Name | Type | Description |
---|---|---|
|
|
The features XML descriptor file to validate. Default value: |
|
|
The Karaf |
|
|
The JRE version that is used during the validation process. Default value: |
|
|
The target Karaf version used to get the Karaf core features (standard and enterprise) \\ Default is the version of the plugin |
|
|
karaf:features-create-kar
Except in unusual circumstances, use the <packaging>kar</packaging>
to run this goal.
The karaf:features-create-kar
goal assembles a KAR archive from a features XML descriptor file, normally generated in
the same project with the karaf:features-generate-descriptor
goal.
kar layout
There are two important directories in a kar:
-
repository/
contains a Maven structured repository of artifacts to be copied into the Karaf repository. The features descriptor and all the bundles mentioned in it are installed in this directory. -
resources/
contains other resources to be copied over the Karaf installation.
Everything in target/classes
is copied into the kar.
Therefore resources you want installed into Karaf need to be in e.g. src/main/resources/resources
.
This choice is so other resources such as legal files from the maven-remote-resources-plugin can be included under META-INF in the kar, without getting installed into Karaf.
Example
<project> ... <packaging>kar</packaging> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <extensions>true</extensions> <!-- There is no useful configuration for the kar mojo. The features-generate-descriptor mojo configuration may be useful --> </plugin> </plugins> </build> </project>
5.6.4. Instances and distributions goals
Normally you should use the karaf-assembly packaging instead of this individual goal.
The karaf-maven-plugin
helps you to build custom Karaf distributions or archives existing Karaf instances.
karaf:install-kars
karaf:instance-create-archive
Normally this is run as part of the karaf-assembly
packaging.
The karaf:instance-create-archive
goal packages a Karaf instance archive from a given assembled instance.
Both tar.gz and zip formats are generated in the destination folder.
Example
The example below create archives for the given Karaf instance:
<project> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <executions> <execution> <id>generate</id> <phase>package</phase> <goals> <goal>instance-create-archive</goal> </goals> <configuration> <destDir>${project.build.directory}</destDir> <targetServerDirectory>${project.build.directory}/assembly</targetServerDirectory> <targetFile>${project.file}</targetFile> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
Parameters
Name | Type | Description |
---|---|---|
|
|
The target directory of the project. Default value: ${project.build.directory} |
|
|
The location of the server repository. Default value: ${project.build.directory}/assembly |
|
|
The target file to set as the project’s artifact. Default value: ${project.file} |
karaf:features-add-to-repository
Consider using the karaf-assembly packaging which makes it easy to assemble a custom distribution in one step instead of this individual goal.
The karaf:features-add-to-repository
goal adds all the required bundles for a given set of features into directory.
You can use this goal to create a /system
directory for building your own Karaf-based distribution.
By default, the Karaf core features descriptors (standard and enterprise) are automatically included in the descriptors set.
Example
The example below copies the bundles for the spring
and war
features defined in the Karaf features XML descriptor into the target/features-repo
directory.
<project> <build> <plugins> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${project.version}</version> <executions> <execution> <id>features-add-to-repo</id> <phase>generate-resources</phase> <goals> <goal>features-add-to-repository</goal> </goals> <configuration> <descriptors> <descriptor>mvn:org.apache.karaf.features/standard/3.0.0/xml/features</descriptor> <descriptor>mvn:my.groupid/my.artifactid/1.0.0/xml/features</descriptor> </descriptors> <features> <feature>spring</feature> <feature>war</feature> <feature>my</feature> </features> <repository>target/features-repo</repository> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
Parameters
Name | Type | Description |
---|---|---|
|
|
List of features XML descriptors where the features are defined |
|
|
List of features that bundles should be copied to the repository directory |
|
|
The directory where the bundles will be copied by the plugin goal |
5.7. Custom distributions
As Karaf is an OSGi container, it’s heavily used as as application and middleware kernel.
You may wish to construct your own Karaf distribution preconfigured to your requirements. This custom distribution could contain:
-
branding to change the Karaf console look-and-feel
-
configuration files (in the etc folder) altered to your requirements
-
pre-packaged artifacts in the deploy folder
-
a pre-populated system repository (containing your own bundle and features descriptor)
-
renamed or specific scripts in the bin folder
-
system documentation files
5.7.1. Maven assembly
The recommended way to create a Karaf server assembly is to use the karaf-assembly packaging with the karaf-maven-plugin. It assembles a server from the maven dependencies in the project pom. After explanation of the configuration options we present an example.
The Karaf project effectively uses this packaging to assemble the official Karaf distributions, but due to maven limitations we have to simulate rather than use the karaf-assembly packaging.
This packaging creates tar.gz and zip archives containing the assembled server. They are identical except that zip archives don’t unpack with appropriate unix file permissions for the scripts.
Maven dependencies
Maven dependencies in a karaf-assembly project can be feature repositories (classifier "features") or kar archives.
Feature repositories are installed in the internal "system" Maven structured repository.
Kar archives have their content unpacked on top of the server as well as contained feature repositories installed.
The Maven scope of a dependency determines whether its feature repository is listed in the features service configuration
file etc/org.apache.karaf.features.cfg
featuresRepositories
property:
-
compile (default): All the features in the repository (or for a kar repositories) will be installed into the startup.properties.
-
runtime: feature installation is controlled by <startupFeature>, <bootFeature>, and <installedFeature> elements in the karaf-maven-plugin configuration.
The feature repo uri is listed in the features service configuration file.
Plugin configuration
Control how features are installed using these elements referring to features from installed feature repositories:
-
<startupFeature>foo</startupFeature>
will result in the feature bundles being listed in startup.properties at the appropriate start level and the bundles being copied into the "system" internal repository. You can use feature_name or feature_name/feature_version formats. -
<bootFeature>bar</bootFeature>
will result in the feature name added to boot-features in the features service configuration file and all the bundles in the feature copied into the "system" internal repository. You can use feature_name or feature_name/feature_version formats. -
<installedFeature>baz</installedFeature>
will result in all the bundles in the feature being installed in the "system" internal repository. Therefore at runtime the feature may be installed without access to external repositories. You can use feature_name or feature_name/feature_version formats.
Minimal Distribution Example
This is the minimal assembly pom changed to use the packaging and annotated
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> ... </parent> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf-minimal</artifactId> <version>${project.version}</version> <packaging>karaf-assembly</packaging> <name>Apache Karaf :: Assemblies :: Minimal Distribution</name> <dependencies> <dependency> <!-- scope is compile so all features (there is only one) are installed into startup.properties and the feature repo itself is not added in etc/org.apache.karaf.features.cfg file --> <groupId>org.apache.karaf.features</groupId> <artifactId>framework</artifactId> <version>${project.version}</version> <type>kar</type> </dependency> <dependency> <!-- scope is runtime so the feature repo is listed in etc/org.apache.karaf.features.cfg file, and features will installed into the system directory --> <groupId>org.apache.karaf.features</groupId> <artifactId>standard</artifactId> <classifier>features</classifier> <type>xml</type> <scope>runtime</scope> </dependency> </dependencies> <build> <!-- if you want to include resources in the distribution --> <resources> <resource> <directory>src/main/resources</directory> <filtering>false</filtering> <includes> <include>**/*</include> </includes> </resource> <resource> <directory>src/main/filtered-resources</directory> <filtering>true</filtering> <includes> <include>**/*</include> </includes> </resource> </resources> <plugins> <!-- if you want to include resources in the distribution --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>2.6</version> <executions> <execution> <id>process-resources</id> <goals> <goal>resources</goal> </goals> </execution> </executions> </plugin> <!-- karaf-maven-plugin will call both install-kar and instance-create-archive goals --> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <extensions>true</extensions> <configuration> <!-- no startupFeatures --> <bootFeatures> <feature>standard</feature> <feature>management</feature> </bootFeatures> <!-- no installedFeatures --> </configuration> </plugin> </plugins> </build> </project>
Custom Distribution Example
It’s possible to specify feature versions using the name/version format.
For instance, to pre-install Spring 4.0.7.RELEASE_1 feature in your custom distribution, you can use the following pom.xml:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>my.custom</groupId> <artifactId>my.distribution</artifactId> <version>1.0</version> <packaging>karaf-assembly</packaging> <dependencies> <dependency> <!-- scope is compile so all features (there is only one) are installed into startup.properties and the feature repo itself is not added in etc/org.apache.karaf.features.cfg file --> <groupId>org.apache.karaf.features</groupId> <artifactId>framework</artifactId> <version>4.0.0</version> <type>kar</type> </dependency> <dependency> <!-- scope is runtime so the feature repo is listed in etc/org.apache.karaf.features.cfg file, and features will installed into the system directory if specify in the plugin configuration --> <groupId>org.apache.karaf.features</groupId> <artifactId>standard</artifactId> <classifier>features</classifier> <type>xml</type> <scope>runtime</scope> </dependency> <dependency> <!-- scope is runtime so the feature repo is listed in etc/org.apache.karaf.features.cfg file, and features will installed into the system directory if specify in the plugin configuration --> <groupId>org.apache.karaf.features</groupId> <artifactId>spring</artifactId> <classifier>features</classifier> <type>xml</type> <scope>runtime</scope> </dependency> </dependencies> <build> <!-- if you want to include resources in the distribution --> <resources> <resource> <directory>src/main/resources</directory> <filtering>false</filtering> <includes> <include>**/*</include> </includes> </resource> <resource> <directory>src/main/filtered-resources</directory> <filtering>true</filtering> <includes> <include>**/*</include> </includes> </resource> </resources> <plugins> <!-- if you want to include resources in the distribution --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>2.6</version> <executions> <execution> <id>process-resources</id> <goals> <goal>resources</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>4.0.0</version> <extensions>true</extensions> <configuration> <!-- no startupFeatures --> <bootFeatures> <feature>jaas</feature> <feature>shell</feature> <feature>ssh</feature> <feature>management</feature> <feature>bundle</feature> <feature>config</feature> <feature>deployer</feature> <feature>diagnostic</feature> <feature>instance</feature> <feature>kar</feature> <feature>log</feature> <feature>package</feature> <feature>service</feature> <feature>system</feature> </bootFeatures> <installedFeatures> <feature>wrapper</feature> <feature>spring/4.0.7.RELEASE_1</feature> </installedFeatures> </configuration> </plugin> </plugins> </build> </project>
5.7.2. (deprecated old style) Maven assembly
Basically a Karaf custom distribution involves:
-
Uncompressing a standard Karaf distribution in a given directory.
-
Populating the system repo with your features.
-
Populating the lib directory with your branding or other system bundle jar files.
-
Overriding the configuration files in the etc folder.
These tasks could be performed using scripting, or more easily and portable, using Apache Maven and a set of Maven plugins.
For instance, the Maven POM could look like:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM http://maven.apache.org/xsd/maven-4.0.0.xsd"> <groupId>my.company</groupId> <artifactId>mycustom-karaf</artifactId> <version>1.0</version> <packaging>pom</packaging> <name>My Unix Custom Karaf Distribution</name> <properties> <karaf.version>${project.version}</karaf.version> </properties> <dependencies> <dependency> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf</artifactId> <version>${karaf.version}</version> <type>tar.gz</type> </dependency> <dependency> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf</artifactId> <version>${karaf.version}</version> <type>xml</type> <classifier>features</classifier> </dependency> </dependencies> <build> <resources> <resource> <directory>${project.basedir}/src/main/filtered-resources</directory> <filtering>true</filtering> <includes> <include>**/*</include> </includes> </resource> </resources> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <executions> <execution> <id>filter</id> <phase>generate-resources</phase> <goals> <goal>resources</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.apache.karaf.tooling</groupId> <artifactId>karaf-maven-plugin</artifactId> <version>${karaf.version}</version> <executions> <execution> <id>add-features-to-repo</id> <phase>generate-resources</phase> <goals> <goal>features-add-to-repo</goal> </goals> <configuration> <descriptors> <descriptor>mvn:org.apache.karaf/apache-karaf/${karaf.version}/xml/features</descriptor> <descriptor>file:${project.basedir}/target/classes/my-features.xml</descriptor> </descriptors> <features> <feature>my-feature</feature> </features> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy</id> <phase>generate-resources</phase> <goals> <goal>copy</goal> </goals> <configuration> <!-- Define here the artifacts which should be considered in the assembly --> <!-- For instance, the branding jar --> <artifactItems> <artifactItem> <groupId>my.groupId</groupId> <artifactId>my.branding.id</artifactId> <version>1.0</version> <outputDirectory>target/dependencies</outputDirectory> <destFileName>mybranding.jar</destFileName> </artifactItem> </artifactItems> </configuration> </execution> <execution> <!-- Uncompress the standard Karaf distribution --> <id>unpack</id> <phase>generate-resources</phase> <goals> <goal>unpack</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf</artifactId> <type>tar.gz</type> <outputDirectory>target/dependencies</outputDirectory> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <executions> <execution> <id>bin</id> <phase>package</phase> <goals> <goal>single</goal> </goals> <configuration> <descriptors> <descriptor>src/main/descriptors/bin.xml</descriptor> </descriptors> <appendAssemblyId>false</appendAssemblyId> <tarLongFileMode>gnu</tarLongFileMode> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
The Maven POM will download the Karaf standard distribution and prepare resources to be processed by the Maven assembly plugin.
Your Maven project structure should look like:
-
pom.xml
: the previous POM file -
src/main/descriptors/bin.xml
: the assembly Maven plugin descriptor (see below) -
src/main/filtered-resources
: contains all resource files that have Maven property values to be filtered/replaced. Typically, this will include features descriptor and configuration files. -
src/main/distribution
: contains all raw files which will be copied as-is into your custom distribution.
For instance, src/main/filtered-resources
could contain:
-
my-features.xml
where Maven properties will be replaced -
etc/org.apache.karaf.features.cfg
file containing your my-features descriptor:
# # Comma separated list of features repositories to register by default # featuresRepositories=mvn:org.apache.karaf/apache-karaf/${karaf.version}/xml/features,mvn:my.groupId/my-features/${project.version}/xml/features # # Comma separated list of features to install at startup # featuresBoot=config,ssh,management,my-feature
The src/main/distribution
contains all your custom Karaf configuration files and script, as, for examples:
-
etc/org.ops4j.pax.logging.cfg
# Root logger log4j.rootLogger=INFO, out, osgi:VmLogAppender log4j.throwableRenderer=org.apache.log4j.OsgiThrowableRenderer # CONSOLE appender not used by default log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t | %-32.32C %4L | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n # File appender log4j.appender.out=org.apache.log4j.RollingFileAppender log4j.appender.out.layout=org.apache.log4j.PatternLayout log4j.appender.out.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t | %-32.32C %4L | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n log4j.appender.out.file=${karaf.home}/log/my-customer-distribution.log log4j.appender.out.append=true log4j.appender.out.maxFileSize=1MB log4j.appender.out.maxBackupIndex=10 # Sift appender log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender log4j.appender.sift.key=bundle.name log4j.appender.sift.default=my-custom log4j.appender.sift.appender=org.apache.log4j.FileAppender log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout log4j.appender.sift.appender.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t | %-32.32c{1} | %-32.32C %4L | %m%n log4j.appender.sift.appender.file=${karaf.data}/log/$\\{bundle.name\\}.log log4j.appender.sift.appender.append=true
-
etc/system.properties
# # The properties defined in this file will be made available through system # properties at the very beginning of the FAS boot process. # # Log level when the pax-logging service is not available # This level will only be used while the pax-logging service bundle # is not fully available. # To change log levels, please refer to the org.ops4j.pax.logging.cfg file # instead. org.ops4j.pax.logging.DefaultServiceLog.level=ERROR # # Name of this custom instance. # karaf.name=my-custom # # Default repository where bundles will be loaded from before using # other Maven repositories. For the full Maven configuration, see the # org.ops4j.pax.url.mvn.cfg file. # karaf.default.repository=system # # Location of a shell script that will be run when starting a shell # session. This script can be used to create aliases and define # additional commands. # karaf.shell.init.script=${karaf.home}/etc/shell.init.script # # Set this empty property to avoid errors when validating xml documents. # xml.catalog.files= # # Suppress the bell in the console when hitting backspace to many times # for example # jline.nobell=true # # Default port for the OSGi HTTP Service # org.osgi.service.http.port=8181 # # Allow usage of ${custom.home} as an alias for ${karaf.home} # custom.home=${karaf.home}
-
etc/users.properties
admin=admin,admin
-
You can add a
etc/custom.properties
, it’s a placeholder for any override you may need. For instance:
karaf.systemBundlesStartLevel=50 obr.repository.url=http://svn.apache.org/repos/asf/servicemix/smx4/obr-repo/repository.xml org.osgi.framework.system.packages.extra = \ org.apache.karaf.branding; \ com.sun.org.apache.xalan.internal.xsltc.trax; \ com.sun.org.apache.xerces.internal.dom; \ com.sun.org.apache.xerces.internal.jaxp; \ com.sun.org.apache.xerces.internal.xni; \ com.sun.jndi.ldap
Now, we can "assemble" our custom distribution using the Maven assembly plugin. The Maven assembly plugin uses an
assembly descriptor, configured in POM above to be src/main/descriptors/bin.xml
:
<assembly> <id>bin</id> <formats> <format>tar.gz</format> </formats> <fileSets> <!-- Expanded Karaf Standard Distribution --> <fileSet> <directory>target/dependencies/apache-karaf-${karaf.version}</directory> <outputDirectory>/</outputDirectory> <excludes> <exclude>**/demos/**</exclude> <exclude>bin/**</exclude> <exclude>etc/system.properties</exclude> <exclude>etc/users.properties</exclude> <exclude>etc/org.apache.karaf.features.cfg</exclude> <exclude>etc/org.ops4j.pax.logging.cfg</exclude> <exclude>LICENSE</exclude> <exclude>NOTICE</exclude> <exclude>README</exclude> <exclude>RELEASE-NOTES</exclude> <exclude>karaf-manual*.html</exclude> <exclude>karaf-manual*.pdf</exclude> </excludes> </fileSet> <!-- Copy over bin/* separately to get the correct file mode --> <fileSet> <directory>target/dependencies/apache-karaf-${karaf.version}</directory> <outputDirectory>/</outputDirectory> <includes> <include>bin/admin</include> <include>bin/karaf</include> <include>bin/start</include> <include>bin/stop</include> </includes> <fileMode>0755</fileMode> </fileSet> <!-- Copy over jar files --> <fileSet> <directory>target/dependencies</directory> <includes> <include>my-custom.jar</include> </includes> <outputDirectory>/lib/</outputDirectory> </fileSet> <fileSet> <directory>src/main/distribution</directory> <outputDirectory>/</outputDirectory> <fileMode>0644</fileMode> </fileSet> <fileSet> <directory>target/classes/etc</directory> <outputDirectory>/etc/</outputDirectory> <lineEnding>unix</lineEnding> <fileMode>0644</fileMode> </fileSet> <fileSet> <directory>target/features-repo</directory> <outputDirectory>/system</outputDirectory> </fileSet> </fileSets> <files> <file> <source>${basedir}/target/dependencies/apache-karaf-${karaf.version}/bin/karaf</source> <outputDirectory>/bin/</outputDirectory> <destName>my-custom</destName> <fileMode>0755</fileMode> <lineEnding>unix</lineEnding> </file> <file> <source>${basedir}/target/classes/features.xml</source> <outputDirectory>/system/my.groupid/my-features/${project.version}</outputDirectory> <destName>my-features-${project.version}-features.xml</destName> <fileMode>0644</fileMode> <lineEnding>unix</lineEnding> </file> </files> </assembly>
To build your custom Karaf distribution, just run:
mvn install
You will find your Karaf custom distribution tar.gz in the target directory.
5.7.3. Custom distribution examples
-
[Apache ServiceMix 4|http://svn.apache.org/repos/asf/servicemix/smx4/features/trunk/assemblies/]
-
[Apache ServiceMix NMR|http://svn.apache.org/repos/asf/servicemix/smx4/nmr/trunk/bundle/]
-
[BuildProcess BuildEraser|http://buildprocess.svn.sourceforge.net/viewvc/buildprocess/builderaser/trunk/assembly/]
5.8. OSGi Services
5.9. Basic bundle creation using the Felix maven-bundle-plugin
Create a bundle instead of a normal jar by using a pom file like this:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>my.groupId</groupId> <artifactId>my.bundle</artifactId> <version>1.0-SNAPSHOT</version> <name>My Bundle</name> <description>My bundle short description</description> <build> <resources> <resource> <directory>${project.basedir}/src/main/resources</directory> <filtering>true</filtering> <includes> <include>**/*</include> </includes> </resource> </resources> <plugins> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <version>2.4.0</version> <extensions>true</extensions> <configuration> <instructions> <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName> ... </instructions> </configuration> </plugin> </plugins> </build> </project>
5.9.1. Add extended information to bundles
Karaf supports a OSGI-INF/bundle.info file in a bundle. This file is extended description of the bundle. It supports ASCII character declarations (for adding color, formatting, etc) and some simple Wiki syntax.
Simply add a src/main/resources/OSGI-INF/bundle.info
file containing, for instance:
h1. SYNOPSIS ${project.description} h1. DESCRIPTION Long description of your bundle, including usage, etc. h1.SEE ALSO [http://yourside\] [http://yourside/docs\]
You can display this extended information using:
root@karaf> bundles:info
5.9.2. Wiki Syntax
Karaf supports some simple wiki syntax in bunde info files:
h1., ====, ... : Headings * : Enumerations [http://....] : links
5.10. Creating bundles for non OSGi third party dependencies
5.10.1. Dynamically wrapping jars
Karaf supports the wrap: protocol execution.
It allows for directly deploying third party dependencies, like Apache Commons Lang:
root@karaf> bundles:install wrap:mvn:commons-lang/commons-lang/2.4
The wrap protocol creates a bundle dynamically using the bnd. Confiugurations can be added in the wrap URL:
from the shell
root@karaf> bundles:install 'wrap:mvn:commons-lang/commons-lang/2.4$Bundle-SymbolicName=commons-lang&Bundle-Version=2.4'
from features.xml
<bundle>wrap:mvn:commons-lang/commons-lang/2.4$Bundle-SymbolicName=commons-lang&Bundle-Version=2.4</bundle>
5.10.2. Statically bundling jars
You can also create a wrap bundle for a third party dependency. This bundle is simply a Maven POM that shades an existing jar and package into a jar bundle.
For instance, to create an OSGi bundle that wraps Apache Commons Lang, simply define the following Maven POM:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>osgi.commons-lang</groupId> <artifactId>osgi.commons-lang</artifactId> <version>2.4</version> <packaging>bundle</packaging> <name>commons-lang OSGi Bundle</name> <description>This OSGi bundle simply wraps commons-lang-2.4.jar artifact.</description> <dependencies> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.4</version> <optional>true</optional> </dependency> </dependencies> <build> <defaultGoal>install</defaultGoal> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>1.1</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <artifactSet> <includes> <include>commons-lang:commons-lang</include> </includes> </artifactSet> <filters> <filter> <artifact>commons-lang:commons-lang</artifact> <excludes> <exclude>**</exclude> </excludes> </filter> </filters> <promoteTransitiveDependencies>true</promoteTransitiveDependencies> <createDependencyReducedPom>true</createDependencyReducedPom> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-bundle-plugin</artifactId> <version>2.1.0</version> <extensions>true</extensions> <configuration> <instructions> <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName> <Export-Package></Export-Package> <Import-Package></Import-Package> <_versionpolicy>[$(version;==;$(@)),$(version;+;$(@)))</_versionpolicy> <_removeheaders>Ignore-Package,Include-Resource,Private-Package,Embed-Dependency</_removeheaders> </instructions> <unpackBundle>true</unpackBundle> </configuration> </plugin> </build> </project>
The resulting OSGi bundle can now be deployed directly:
root@karaf> bundles:install -s mvn:osgi.commons-lang/osgi.commons-lang/2.4
5.11. Blueprint
5.12. CDI
5.13. Archetypes
Karaf provides archetypes to easily create commands, manage [features or repository and create a kar archive. This section describes each of them and explain How to use it.
5.13.1. Create a command (karaf-command-archetype)
This archetype creates a Maven skeleton project that you will use to develop new Karaf commands.
Command line
Using the command line, we can create our project:
mvn archetype:generate \ -DarchetypeGroupId=org.apache.karaf.archetypes \ -DarchetypeArtifactId=karaf-command-archetype \ -DarchetypeVersion=${project.version} \ -DgroupId=com.mycompany \ -DartifactId=com.mycompany.command \ -Dversion=1.0-SNAPSHOT \ -Dpackage=com.mycompany.package
Additional parameters
During the maven creation process, additional questions will be asked on the console :
-
Define value for property command: The name of the command (list, add-item, …)
-
Define value for property description: Provide a description of the command that you want to create. This description will be displayed in the Karaf console when the parameter --help is used
-
Define value for property scope: This value represents the family name to which the command belongs (features, osgi, admin, jaas, …)
Result of Maven command execution
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.apache.karaf.archetypes:karaf-command-archetype:${project.version}] found in catalog local [INFO] Using property: groupId = com.mycompany [INFO] Using property: artifactId = com.mycompany.command [INFO] Using property: version = 1.0-SNAPSHOT [INFO] Using property: package = com.mycompany.package Define value for property 'command': : list Define value for property 'description': : List sample command Define value for property 'scope': : my Confirm properties configuration: groupId: com.mycompany artifactId: com.mycompany.command version: 1.0-SNAPSHOT package: com.mycompany.package command: list description: List sample command scope: my Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: karaf-command-archetype:${project.version} [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.command [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: packageInPathFormat, Value: com/mycompany/package [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: scope, Value: my [INFO] Parameter: description, Value: List sample command [INFO] Parameter: command, Value: list [INFO] Parameter: artifactId, Value: com.mycompany.command [WARNING] Don't override file /home/jbonofre/workspace/karaf/test/com.mycompany.command/pom.xml [INFO] project created from Archetype in dir: /home/jbonofre/workspace/karaf/test/com.mycompany.command [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 27.204s [INFO] Finished at: Mon Dec 19 09:38:49 CET 2011 [INFO] Final Memory: 7M/111M [INFO] ------------------------------------------------------------------------
Next, you can import your project in Eclipse/IntelliJ and developp the karaf command.
5.13.2. Create an OSGi bundle (karaf-bundle-archetype)
This archetype creates a Maven skeleton to create an OSGi bundle, including a bundle Activator (a special callback class for bundle start/stop).
Command line
Using the command line, we can create our project:
mvn archetype:generate \ -DarchetypeGroupId=org.apache.karaf.archetypes \ -DarchetypeArtifactId=karaf-bundle-archetype \ -DarchetypeVersion=${project.version} \ -DgroupId=com.mycompany \ -DartifactId=com.mycompany.bundle \ -Dversion=1.0-SNAPSHOT \ -Dpackage=com.mycompany.package
Result of Maven command execution
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.apache.karaf.archetypes:karaf-bundle-archetype:${project.version}] found in catalog local [INFO] Using property: groupId = com.mycompany [INFO] Using property: artifactId = com.mycompany.bundle [INFO] Using property: version = 1.0-SNAPSHOT [INFO] Using property: package = com.mycompany.package Confirm properties configuration: groupId: com.mycompany artifactId: com.mycompany.bundle version: 1.0-SNAPSHOT package: com.mycompany.package Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: karaf-bundle-archetype:${project.version} [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.bundle [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: packageInPathFormat, Value: com/mycompany/package [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.bundle [INFO] project created from Archetype in dir: /home/jbonofre/workspace/karaf/test/com.mycompany.bundle [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 7.895s [INFO] Finished at: Mon Dec 19 11:41:44 CET 2011 [INFO] Final Memory: 8M/111M [INFO] ------------------------------------------------------------------------
5.13.3. Create an OSGi blueprint bundle (karaf-blueprint-archetype)
This archetype creates a Maven skeleton project to create an OSGi blueprint bundle, including a sample bean exposed as an OSGi service in the blueprint XML descriptor.
Command line
Using the command line, we can create our project:
mvn archetype:generate \ -DarchetypeGroupId=org.apache.karaf.archetypes \ -DarchetypeArtifactId=karaf-blueprint-archetype \ -DarchetypeVersion=${project.version} \ -DgroupId=com.mycompany \ -DartifactId=com.mycompany.blueprint \ -Dversion=1.0-SNAPSHOT \ -Dpackage=com.mycompany.blueprint
Result of Maven command execution
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.apache.karaf.archetypes:karaf-blueprint-archetype:${project.version}] found in catalog local [INFO] Using property: groupId = com.mycompany [INFO] Using property: artifactId = com.mycompany.blueprint [INFO] Using property: version = 1.0-SNAPSHOT [INFO] Using property: package = com.mycompany.package Confirm properties configuration: groupId: com.mycompany artifactId: com.mycompany.blueprint version: 1.0-SNAPSHOT package: com.mycompany.package Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: karaf-blueprint-archetype:${project.version} [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.blueprint [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: packageInPathFormat, Value: com/mycompany/package [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.blueprint [INFO] project created from Archetype in dir: /home/jbonofre/workspace/karaf/test/com.mycompany.blueprint [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1:06:36.741s [INFO] Finished at: Mon Dec 19 13:04:43 CET 2011 [INFO] Final Memory: 7M/111M [INFO] ------------------------------------------------------------------------
5.13.4. Create a features XML (karaf-feature-archetype)
This archetype creates a Maven skeleton project which create a features XML file, using the dependencies that you define in the POM.
Command line
Using the command line, we can create our project:
mvn archetype:generate \ -DarchetypeGroupId=org.apache.karaf.archetypes \ -DarchetypeArtifactId=karaf-feature-archetype \ -DarchetypeVersion=${project.version} \ -DgroupId=my.company \ -DartifactId=my.company.feature \ -Dversion=1.0-SNAPSHOT \ -Dpackage=my.company.package
Result of maven command execution
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.apache.karaf.archetypes:karaf-feature-archetype:${project.version}] found in catalog local [INFO] Using property: groupId = com.mycompany [INFO] Using property: artifactId = com.mycompany.feature [INFO] Using property: version = 1.0-SNAPSHOT [INFO] Using property: package = com.mycompany.package Confirm properties configuration: groupId: com.mycompany artifactId: com.mycompany.feature version: 1.0-SNAPSHOT package: com.mycompany.package Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: karaf-feature-archetype:${project.version} [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.feature [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: packageInPathFormat, Value: com/mycompany/package [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.feature [INFO] project created from Archetype in dir: /home/jbonofre/workspace/karaf/test/com.mycompany.feature [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 7.262s [INFO] Finished at: Mon Dec 19 13:20:00 CET 2011 [INFO] Final Memory: 7M/111M [INFO] ------------------------------------------------------------------------
5.13.5. Create a KAR file (karaf-kar-archetype)
This archetype creates a Maven skeleton project including a features XML sample, used to generate a KAR file.
Command line
Using the command line, we can create our project:
mvn archetype:generate \ -DarchetypeGroupId=org.apache.karaf.archetypes \ -DarchetypeArtifactId=karaf-kar-archetype \ -DarchetypeVersion=${project.version} \ -DgroupId=com.mycompany \ -DartifactId=com.mycompany.kar \ -Dversion=1.0-SNAPSHOT \ -Dpackage=com.mycompany.package
Result of maven command execution
[INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.1:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.apache.karaf.archetypes:karaf-kar-archetype:${project.version}] found in catalog local [INFO] Using property: groupId = com.mycompany [INFO] Using property: artifactId = com.mycompany.kar [INFO] Using property: version = 1.0-SNAPSHOT [INFO] Using property: package = com.mycompany.package Confirm properties configuration: groupId: com.mycompany artifactId: com.mycompany.kar version: 1.0-SNAPSHOT package: com.mycompany.package Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: karaf-kar-archetype:${project.version} [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.kar [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: packageInPathFormat, Value: com/mycompany/package [INFO] Parameter: package, Value: com.mycompany.package [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: groupId, Value: com.mycompany [INFO] Parameter: artifactId, Value: com.mycompany.kar [INFO] project created from Archetype in dir: /home/jbonofre/workspace/karaf/test/com.mycompany.kar [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 7.465s [INFO] Finished at: Mon Dec 19 13:30:15 CET 2011 [INFO] Final Memory: 8M/157M [INFO] ------------------------------------------------------------------------
5.14. Security framework
Karaf supports JAAS with some enhancements to allow JAAS to work nicely in an OSGi environment. This framework also features an OSGi keystore manager with the ability to deploy new keystores or truststores at runtime.
5.14.1. Overview
This feature allows runtime deployment of JAAS based configuration for use in various parts of the application. This
includes the remote console login, which uses the karaf
realm, but which is configured with a dummy login module
by default. These realms can also be used by the NMR, JBI components or the JMX server to authenticate users logging in
or sending messages into the bus.
In addition to JAAS realms, you can also deploy keystores and truststores to secure the remote shell console, setting up HTTPS connectors or using certificates for WS-Security.
A very simple XML schema for spring has been defined, allowing the deployment of a new realm or a new keystore very easily.
5.14.2. Schema
To override or deploy a new realm, you can use the following XSD which is supported by a Spring namespace handler and can thus be defined in a Spring xml configuration file.
Following is the XML Schema to use when defining Karaf realms.
You can find the schema at the following location: http://karaf.apache.org/xmlns/jaas/v1.1.0
Here are two examples using this schema:
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.0.0" xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"> <!-- Bean to allow the $[karaf.base] property to be correctly resolved --> <ext:property-placeholder placeholder-prefix="$[" placeholder-suffix="]"/> <jaas:config name="myrealm"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties </jaas:module> </jaas:config> </blueprint>
<jaas:keystore xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0" name="ks" rank="1" path="classpath:privatestore.jks" keystorePassword="keyStorePassword" keyPasswords="myalias=myAliasPassword"> </jaas:keystore>
The id
attribute is the blueprint id of the bean, but it will be used by default as the name of the realm if no
name
attribute is specified. Additional attributes on the config
elements are a rank
, which is an integer.
When the LoginContext looks for a realm for authenticating a given user, the realms registered in the OSGi registry are
matched against the required name. If more than one realm is found, the one with the highest rank will be used, thus
allowing the override of some realms with new values. The last attribute is publish
which can be set to false to
not publish the realm in the OSGi registry, thereby disabling the use of this realm.
Each realm can contain one or more module definitions. Each module identifies a LoginModule and the className
attribute must be set to the class name of the login module to use. Note that this login module must be available from
the bundle classloader, so either it has to be defined in the bundle itself, or the needed package needs to be correctly
imported.
The content of the module
element is parsed as a properties file and will be used to further configure the login module.
Deploying such a code will lead to a JaasRealm object in the OSGi registry, which will then be used when using the JAAS login module.
Configuration override and use of the rank
attribute
The rank
attribute on the config
element is tied to the ranking of the underlying OSGi service. When the JAAS
framework performs an authentication, it will use the realm name to find a matching JAAS configuration. If multiple
configurations are used, the one with the highest rank
attribute will be used.
So if you want to override the default security configuration in Karaf (which is used by the ssh shell, web console and
JMX layer), you need to deploy a JAAS configuration with the name name="karaf"
and rank="1"
.
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0" xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"> <!-- Bean to allow the $[karaf.base] property to be correctly resolved --> <ext:property-placeholder placeholder-prefix="$[" placeholder-suffix="]"/> <type-converters> <bean class="org.apache.karaf.jaas.modules.properties.PropertiesConverter"/> </type-converters> <jaas:config name="karaf" rank="1"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties ... </jaas:module> </jaas:config> </blueprint>
5.14.3. Architecture
Due to constraints in the JAAS specification, one class has to be available for all bundles. This class is called ProxyLoginModule and is a LoginModule that acts as a proxy for an OSGi defines LoginModule. If you plan to integrate this feature into another OSGi runtime, this class must be made available from the system classloader and the related package be part of the boot delegation classpath (or be deployed as a fragment attached to the system bundle).
The xml schema defined above allows the use of a simple xml (leveraging spring xml extensibility) to configure and register a JAAS configuration for a given realm. This configuration will be made available into the OSGi registry as a JaasRealm and the OSGi specific Configuration will look for such services. Then the proxy login module will be able to use the information provided by the realm to actually load the class from the bundle containing the real login module.
Karaf itself provides a set of login modules ready to use, depending of the authentication backend that you need.
In addition of the login modules, Karaf also support backend engine. The backend engine is coupled to a login module and allows you to manipulate users and roles directly from Karaf (adding a new user, delete an existing user, etc). The backend engine is constructed by a backend engine factory, registered as an OSGi service. Some login modules (for security reason for instance) don’t provide backend engine.
5.14.4. Available realm and login modules
Karaf comes with a default realm named "karaf" using login modules.
Karaf also provides a set of login modules and backend engines to handle authentication needs for your environment.
PropertiesLoginModule
LoginModule | BackendEngineFactory |
---|---|
|
|
This login module is the one configured by default. It uses a properties text file to load the users, passwords and roles.
Name | Description |
---|---|
|
location of the properties file |
This file uses the properties file format. The format of the properties is as follows, with each line defining a user, its password and associated roles:
user=password[,role][,role]...
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = ${karaf.etc}/users.properties </jaas:module> </jaas:config>
The PropertiesLoginModule provides a backend engine allowing:
-
add a new user
-
delete an existing user
-
list the users, groups, and roles
-
add a new role to an user
-
delete a role from an user
-
add an user into a group
-
remove an user from a group
-
add a role to a group
-
delete a role from a group
To enable the backend engine, you have to register the corresponding OSGi service. For instance, the following blueprint shows how to register the PropertiesLoginModule and the corresponding backend engine:
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0" xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"> <jaas:config name="karaf" rank="-1"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = ${karaf.etc}/users.properties </jaas:module> </jaas:config> <service interface="org.apache.karaf.jaas.modules.BackingEngineFactory"> <bean class="org.apache.karaf.jaas.modules.properties.PropertiesBackingEngineFactory"/> </service> </blueprint>
OsgiConfigLoginModule
LoginModule | BackendEngineFactory |
---|---|
|
N/A |
The OsgiConfigLoginModule uses the OSGi ConfigurationAdmin service to provide the users, passwords and roles.
Name | Description |
---|---|
|
the PID of the configuration containing user definitions |
The format of the configuration is the same than for the PropertiesLoginModule
with properties prefixed with user.
.
For instance, in the Karaf etc folder, we create a file org.apache.karaf.authentication.cfg
containing:
user.karaf=karaf,admin user.user=password,role
The following blueprint shows how to use this configuration:
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0"> <jaas:config name="karaf" rank="-1"> <jaas:module className="org.apache.karaf.jaas.modules.osgi.OsgiConfigLoginModule" flags="required"> pid = org.apache.karaf.authentication </jaas:module> </jaas:config> </blueprint>
Note
|
The OsgiConfigLoginModule doesn’t provide a backend engine. |
JDBCLoginModule
LoginModule | BackendEngineFactory |
---|---|
|
|
The JDBCLoginModule uses a database to load the users, passwords and roles from a provided data source (normal or XA). The data source and the queries for password and role retrieval are configurable using the following parameters.
Name | Description |
---|---|
|
The datasource as on OSGi ldap filter or as JDNI name |
|
The SQL query that retries the password of the user |
|
The SQL query that retries the roles of the user |
Passing a data source as an OSGi ldap filter
To use an OSGi ldap filter, the prefix osgi: needs to be provided, as shown below:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.jdbc.JDBCLoginModule" flags="required"> datasource = osgi:javax.sql.DataSource/(osgi.jndi.service.name=jdbc/karafdb) query.password = SELECT PASSWORD FROM USERS WHERE USERNAME=? query.role = SELECT ROLE FROM ROLES WHERE USERNAME=? </jaas:module> </jaas:config>
Passing a data source as a JNDI name
To use an JNDI name, the prefix jndi: needs to be provided. The example below assumes the use of Aries jndi to expose services via JNDI.
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.jdbc.JDBCLoginModule" flags="required"> datasource = jndi:aries:services/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/karafdb) query.password = SELECT PASSWORD FROM USERS WHERE USERNAME=? query.role = SELECT ROLE FROM ROLES WHERE USERNAME=? </jaas:module> </jaas:config>
The JDBCLoginModule provides a backend engine allowing:
-
add a new user
-
delete an user
-
list users, roles
-
add a new role to an user
-
remove a role from an user
Note
|
The groups are not fully supported by the JDBCBackingEngine. |
The following blueprint shows how to define the JDBCLoginModule with the corresponding backend engine:
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0"> <jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.jdbc.JDBCLoginModule" flags="required"> datasource = jndi:aries:services/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/karafdb) query.password = SELECT PASSWORD FROM USERS WHERE USERNAME=? query.role = SELECT ROLE FROM ROLES WHERE USERNAME=? insert.user = INSERT INTO USERS(USERNAME,PASSWORD) VALUES(?,?) insert.role = INSERT INTO ROLES(ROLE,USERNAME) VALUES(?,?) delete.user = DELETE FROM USERS WHERE USERNAME=? </jaas:module> </jaas:config> <service interface="org.apache.karaf.jaas.modules.BackingEngineFactory"> <bean class="org.apache.karaf.jaas.modules.jdbc.JDBCBackingEngineFactory"/> </service> </blueprint>
LDAPLoginModule
LoginModule | BackendEngineFactory |
---|---|
|
N/A |
The LDAPLoginModule uses LDAP to load the users and roles and bind the users on the LDAP to check passwords.
The LDAPLoginModule supports the following parameters:
Name | Description |
---|---|
|
The LDAP connection URL, e.g. ldap://hostname |
|
Admin username to connect to the LDAP. This parameter is optional, if it’s not provided, the LDAP connection will be anonymous. |
|
Admin password to connect to the LDAP. Only used if the |
|
The LDAP base DN used to looking for user, e.g. ou=user,dc=apache,dc=org |
|
The LDAP filter used to looking for user, e.g. (uid=%u) where %u will be replaced by the username. |
|
If "true", the user lookup will be recursive (SUBTREE). If "false", the user lookup will be performed only at the first level (ONELEVEL). |
|
The LDAP base DN used to looking for roles, e.g. ou=role,dc=apache,dc=org |
|
The LDAP filter used to looking for user’s role, e.g. (member:=uid=%u) |
|
The LDAP role attribute containing the role string used by Karaf, e.g. cn |
|
If "true", the role lookup will be recursive (SUBTREE). If "false", the role lookup will be performed only at the first level (ONELEVEL). |
|
Define a mapping between roles defined in the LDAP directory for the user, and corresponding roles in Karaf. The format is ldapRole1=karafRole1,karafRole2;ldapRole2=karafRole3,karafRole4. |
|
Define the authentication backend used on the LDAP server. The default is simple. |
|
Define the initial context factory used to connect to the LDAP server. The default is com.sun.jndi.ldap.LdapCtxFactory |
`ssl |
If "true" or if the protocol on the |
|
The provider name to use for SSL |
|
The protocol name to use for SSL (SSL for example) |
|
The algorithm to use for the KeyManagerFactory and TrustManagerFactory (PKIX for example) |
|
The key store name to use for SSL. The key store must be deployed using a |
|
The key alias to use for SSL |
|
The trust store name to use for SSL. The trust store must be deployed using a |
A example of LDAPLoginModule usage follows:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.ldap.LDAPLoginModule" flags="required"> connection.url = ldap://localhost:389 user.base.dn = ou=user,dc=apache,dc=org user.filter = (cn=%u) user.search.subtree = true role.base.dn = ou=group,dc=apache,dc=org role.filter = (member:=uid=%u) role.name.attribute = cn role.search.subtree = true authentication = simple </jaas:module> </jaas:config>
If you wish to use an SSL connection, the following configuration can be used as an example:
<ext:property-placeholder /> <jaas:config name="karaf" rank="1"> <jaas:module className="org.apache.karaf.jaas.modules.ldap.LDAPLoginModule" flags="required"> connection.url = ldaps://localhost:10636 user.base.dn = ou=users,ou=system user.filter = (uid=%u) user.search.subtree = true role.base.dn = ou=groups,ou=system role.filter = (uniqueMember=uid=%u) role.name.attribute = cn role.search.subtree = true authentication = simple ssl.protocol=SSL ssl.truststore=ks ssl.algorithm=PKIX </jaas:module> </jaas:config> <jaas:keystore name="ks" path="file:///${karaf.home}/etc/trusted.ks" keystorePassword="secret" />
The LDAPLoginModule supports the following patterns that you can use in the filter (user and role filters):
-
%u
is replaced by the user -
%dn
is replaced by the user DN -
%fqdn
is replaced by the user full qualified DN (userDNNamespace
).
For instance, the following configuration will work properly with ActiveDirectory (adding the ActiveDirectory to the
default karaf
realm):
<jaas:config name="karaf" rank="2"> <jaas:module className="org.apache.karaf.jaas.modules.ldap.LDAPLoginModule" flags="required"> initialContextFactory=com.sun.jndi.ldap.LdapCtxFactory connection.username=admin connection.password=xxxxxxx connection.protocol= connection.url=ldap://activedirectory_host:389 user.base.dn=ou=Users,ou=there,DC=local user.filter=(sAMAccountName=%u) user.search.subtree=true role.base.dn=ou=Groups,ou=there,DC=local role.name.attribute=cn role.filter=(member=%nsdn) role.search.subtree=true authentication=simple </jaas:module> </jaas:config>
Note
|
The LDAPLoginModule doesn’t provide backend engine. It means that the administration of the users and roles should be performed directly on the LDAP backend. |
SyncopeLoginModule
LoginModule | BackendEngineFactory |
---|---|
|
|
The Syncope login module uses the Syncope REST API to authenticate users and retrieve the roles.
The Syncope login module just requires one parameter:
Name | Description |
---|---|
|
Location of the Syncope REST API |
|
Admin username to administrate Syncope (only required by the backend engine) |
|
Admin password to administrate Syncope (only required by the backend engine) |
The following snippet shows how to use Syncope with the karaf realm:
<jaas:config name="karaf" rank="2"> <jaas:module className="org.apache.karaf.jaas.modules.syncope.SyncopeLoginModule" flags="required"> address=http://localhost:9080/syncope/cxf admin.user=admin admin.password=password </jaas:module> </jaas:config>
SyncopeLoginModule comes with a backend engine allowing to manipulate users and roles. You have to register the SyncopeBackendEngineFactory service.
For security reason, the SyncopeLoginModule backend engine allows only to list users and roles. You can’t create or delete users and roles directly from Karaf. To do it, you have to use the Syncope web console.
For instance, the following blueprint descriptor enables the SyncopeLoginModule and the backend engine factory:
<?xml version="1.0" encoding="UTF-8"?> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:jaas="http://karaf.apache.org/xmlns/jaas/v1.1.0" xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"> <jaas:config name="karaf" rank="2"> <jaas:module className="org.apache.karaf.jaas.modules.syncope.SyncopeLoginModule" flags="required"> address=http://localhost:9080/syncope/cxf admin.user=admin admin.password=password </jaas:module> </jaas:config> <service interface="org.apache.karaf.jaas.modules.BackingEngineFactory"> <bean class="org.apache.karaf.jaas.modules.syncope.SyncopeBackingEngineFactory"/> </service> </blueprint>
5.14.5. Encryption service
The EncryptionService is a service registered in the OSGi registry providing means to encrypt and check encrypted passwords. This service acts as a factory for Encryption objects actually performing the encryption.
This service is used in all Karaf login modules to support encrypted passwords.
Configuring properties
Each login module supports the following additional set of properties:
Name | Description |
---|---|
|
Name of the encryption service registered in OSGi |
|
Boolean used to turn on encryption |
|
Prefix for encrypted passwords |
|
Suffix for encrypted passwords |
|
Name of an algorithm to be used for hashing, like "MD5" or "SHA-1" |
|
Encrypted passwords encoding (can be |
|
A policy for identifying roles (can be |
|
A discriminator value to be used by the role policy |
A simple example follows:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties encryption.enabled = true encryption.algorithm = MD5 encryption.encoding = hexadecimal </jaas:module> </jaas:config>
Prefix and suffix
The login modules have the ability to support both encrypted and plain passwords at the same time. In some cases, some login modules may be able to encrypt the passwords on the fly and save them back in an encrypted form.
Jasypt
Karaf default installation comes with a simple encryption service which usually fullfill simple needs. However, in some cases, you may want to install the Jasypt library which provides stronger encryption algorithms and more control over them.
To install the Jasypt library, the easiest way is to install the available feature:
karaf@root> features:install jasypt-encryption
It will download and install the required bundles and also register an EncryptionService
for Jasypt in the OSGi registry.
When configuring a login module to use Jasypt, you need to specify the encryption.name
property and set it to a value of jasypt
to make sure the Jasypt encryption service will be used.
In addition to the standard properties above, the Jasypt service provides the following parameters:
Name | Description |
---|---|
|
Name of the |
|
Class name for the security provider to be used for obtaining the digest algorithm |
|
Number of times the hash function will be applied recursively |
|
Size of the salt to be used to compute the digest |
|
Class name of the salt generator |
A typical realm definition using Jasypt encryption service would look like:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties encryption.enabled = true encryption.name = jasypt encryption.algorithm = SHA-256 encryption.encoding = base64 encryption.iterations = 100000 encryption.saltSizeBytes = 16 </jaas:module> </jaas:config>
Using encrypted property placeholders
When using blueprint framework for OSGi for configuring devices that requires passwords like JDBC datasources, it is undesirable to use plain text passwords in configuration files. To avoid this problem it is good to store database passwords in encrypted format and use encrypted property placeholders when ever possible.
Encrypted properties can be stored in plain properties files. The encrypted content is wrapped by an ENC() function.
#db.cfg / db.properties db.url=localhost:9999 db.username=admin db.password=ENC(zRM7Pb/NiKyCalroBz8CKw==)
The encrypted property placeholders can be used either by defining Apache Aries ConfigAdmin property-placeholder
or by directly using the Apache Karaf property-placeholder
. It has one child element encryptor
that contains
the actual Jasypt configuration. For detailed information on how to configure the different Jasypt encryptors, see the
Jasypt documentation.
A typical definition using Jasypt encryption would look like:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0" xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0" xmlns:enc="http://karaf.apache.org/xmlns/jasypt/v1.0.0"> <!-- Configuration via ConfigAdmin property-placeholder --> <!-- the etc/*.cfg can contain encrypted values with ENC() function --> <cm:property-placeholder persistent-id="db" update-strategy="reload"> <cm:default-properties> <cm:property name="encoded" value="ENC(${foo})"/> </cm:default-properties> </cm:property-placeholder> <!-- Configuration via properties file --> <!-- Instead of ConfigAdmin, we can load "regular" properties file from a location --> <!-- Again, the db.properties file can contain encrypted values with ENC() function --> <ext:property-placeholder> <ext:location>file:etc/db.properties</ext:location> </ext:property-placeholder> <enc:property-placeholder> <enc:encryptor class="org.jasypt.encryption.pbe.StandardPBEStringEncryptor"> <property name="config"> <bean class="org.jasypt.encryption.pbe.config.EnvironmentStringPBEConfig"> <property name="algorithm" value="PBEWithMD5AndDES"/> <property name="passwordEnvName" value="ENCRYPTION_PASSWORD"/> </bean> </property> </enc:encryptor> </enc:property-placeholder> <!-- ... --> </blueprint>
Don’t forget to install the jasypt feature to add the support of the enc namespace:
karaf@root()> feature:install jasypt-encryption
5.14.6. Role discovery policies
The JAAS specification does not provide means to distinguish between User and Role Principals without referring to the specification classes. In order to provide means to the application developer to decouple the application from Karaf JAAS implementation role policies have been created.
A role policy is a convention that can be adopted by the application in order to identify Roles, without depending from the implementation. Each role policy can be cofigured by setting a "role.policy" and "role.discriminator" property to the login module configuration. Currently, Karaf provides two policies that can be applied to all Karaf Login Modules.
-
Prefixed Roles
-
Grouped Roles
Prefixed Roles
When the prefixed role policy is used the login module applies a configurable prefix (property role.discriminator)
to
the role, so that the application can identify the role’s principals by its prefix. Example:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties role.policy = prefix role.discriminator = ROLE_ </jaas:module> </jaas:config>
The application can identify the role principals using a snippet like this:
LoginContext ctx = new LoginContext("karaf", handler); ctx.login(); authenticated = true; subject = ctx.getSubject(); for (Principal p : subject.getPrincipals()) { if (p.getName().startsWith("ROLE_")) { roles.add((p.getName().substring("ROLE_".length()))); } }
Grouped Roles
When the group role policy is used the login module provides all roles as members of a group with a configurable name (property role.discriminator)
. Example:
<jaas:config name="karaf"> <jaas:module className="org.apache.karaf.jaas.modules.properties.PropertiesLoginModule" flags="required"> users = $[karaf.base]/etc/users.properties role.policy = group role.discriminator = ROLES </jaas:module> </jaas:config>
LoginContext ctx = new LoginContext("karaf", handler); ctx.login(); authenticated = true; subject = ctx.getSubject(); for (Principal p : subject.getPrincipals()) { if ((p instanceof Group) && ("ROLES".equalsIgnoreCase(p.getName()))) { Group g = (Group) p; Enumeration<? extends Principal> members = g.members(); while (members.hasMoreElements()) { Principal member = members.nextElement(); roles.add(member.getName()); } } }
5.14.7. Default role policies
The previous section describes how to leverage role policies. However, Karaf provides a default role policy, based on the following class names:
-
org.apache.karaf.jaas.modules.UserPrincipal
-
org.apache.karaf.jaas.modules.RolePrincipal
-
org.apache.karaf.jaas.modules.GroupPrincipal
It allows you to directly handling the role class:
String rolePrincipalClass = "org.apache.karaf.jaas.modules.RolePrincipal"; for (Principal p : subject.getPrincipals()) { if (p.getClass().getName().equals(rolePrincipalClass)) { roles.add(p.getName()); } }
5.15. Troubleshooting, Debugging, Profiling, and Monitoring
5.15.1. Troubleshooting
Logging
Logging is easy to control through the console, with commands grouped under log
shell. To learn about the available
logging commands type:
karaf@root> log<tab> log:display log:display-exception log:get log:set karaf@root>
Typical usage is:
-
Use
log:set
to dynamically change the global log level -
Execute the problematic operation
-
Use
log:display
(orlog:display-exception
to display the log
Worst Case Scenario
If you end up with a Karaf in a really bad state (i.e. you can not boot it anymore) or you just want to revert to a
clean state quickly, you can safely remove the data
directory just in the installation directory. This folder
contains transient data and will be recreated if removed when you relaunch Karaf.
You may also want to remove the files in the deploy
folder to avoid them being automatically installed when Karaf
is started the first time.
5.15.2. Debugging
Usually, the easiest way to debug Karaf or any application deployed onto it is to use remote debugging.
Remote debugging can be easily activated by using the debug
parameter on the command line.
> bin/karaf debug
or on Windows
> bin\karaf.bat debug
Another option is to set the KARAF_DEBUG
environment variable to TRUE
.
This can be done using the following command on Unix systems:
export KARAF_DEBUG=true
On Windows, use the following command
set KARAF_DEBUG=true
Then, you can launch Karaf using the usual way:
bin/karaf
or
bin\karaf.bat
Last, inside your IDE, connect to the remote application (the default port to connect to is 5005).
This option works fine when it is needed to debug a project deployed top of Apache Karaf. Nervertheless, you will be blocked if you would like to debug the server Karaf. In this case, you can change the following parameter suspend=y in the karaf.bat script file. That will cause the JVM to pause just before running main() until you attach a debugger then it will resume the execution. This way you can set your breakpoints anywhere in the code and you should hit them no matter how early in the startup they are.
export DEFAULT_JAVA_DEBUG_OPTS='-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005'
and on Windows,
set DEFAULT_JAVA_DEBUG_OPTS='-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005'
5.15.3. Profiling
jVisualVM
You have to edit the etc/config.properties
configuration file to add the jVisualVM package:
org.osgi.framework.bootdelegation=...,org.netbeans.lib.profiler.server
Run Karaf from the console, and you should now be able to connect using jVisualVM.
YourKit
You need a few steps to be able to profile Karaf using YourKit.
The first one is to edit the etc/config.properties
configuration file and add the following property:
org.osgi.framework.bootdelegation=...,com.yourkit.*
Then, set the JAVA_OPTS
environment variable:
export JAVA_OPTS='-Xmx512M -agentlib:yjpagent'
or, on Windows
set JAVA_OPTS='-Xmx512M -agentlib:yjpagent'
Run Karaf from the console, and you should now be able to connect using YourKit standalone or from your favorite IDE.
5.15.4. Monitoring
Karaf uses JMX for monitoring and management of all Karaf components.
The JMX connection could be:
-
local using the process id
-
remote using the
rmiRegistryPort
property defined inetc/org.apache.karaf.management.cfg
file.
Using JMX, you can have a clean overview of the running Karaf instance:
-
A overview with graphics displaying the load in terms of thread, heap/GC, etc:
-
A thread overview:
-
A memory heap consumption, including "Perform GC" button:
-
A complete JVM summary, with all number of threads, etc:
You can manage Karaf features like you are in the shell. For example, you have access to the Admin service MBean, allowing you to create, rename, destroy, change SSH port, etc. Karaf instances:
You can also manage Karaf features MBean to list, install, and uninstall Karaf features:
5.16. Writing integration tests
We recommend using PAX Exam to write integration tests when developing applications using Karaf.
5.16.1. Introduction
To make use of this new framework simply add the following dependencies into your integration tests pom.xml:
<!-- Karaf Test Framework Version --> <dependency> <groupId>org.ops4j.pax.exam</groupId> <artifactId>pax-exam-container-karaf</artifactId> <version>${pax.exam.version}</version> <scope>test</scope> </dependency> <!-- Pax Exam version you would like to use. At least 2.2.x is required. --> <dependency> <groupId>org.ops4j.pax.exam</groupId> <artifactId>pax-exam-junit4</artifactId> <version>${pax.exam.version}</version> <scope>test</scope> </dependency>
As a next step you need to reference the distribution you want to run your tests on. For example, if you want to run your tests on Karaf the following section would be required in the integration tests pom.xml:
<dependency> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf</artifactId> <version>${project.version}</version> <type>zip</type> <scope>test</scope> </dependency>
If you want to make use of Exams "versionAsInProject" feature you also need to add the following section:
<build> <plugins> <plugin> <groupId>org.apache.servicemix.tooling</groupId> <artifactId>depends-maven-plugin</artifactId> <version>${plugin.depends.version}</version> <executions> <execution> <id>generate-depends-file</id> <goals> <goal>generate-depends-file</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
With this done we can start writing our first test case:
import static junit.framework.Assert.assertTrue; import static org.apache.karaf.tooling.exam.options.KarafDistributionOption.karafDistributionConfiguration; import static org.ops4j.pax.exam.CoreOptions.maven; import org.junit.Test; import org.junit.runner.RunWith; import org.ops4j.pax.exam.Option; import org.ops4j.pax.exam.junit.Configuration; import org.ops4j.pax.exam.junit.ExamReactorStrategy; import org.ops4j.pax.exam.junit.JUnit4TestRunner; import org.ops4j.pax.exam.spi.reactors.AllConfinedStagedReactorFactory; @RunWith(JUnit4TestRunner.class) @ExamReactorStrategy(AllConfinedStagedReactorFactory.class) public class VersionAsInProjectKarafTest { @Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration().frameworkUrl( maven().groupId("org.apache.karaf").artifactId("apache-karaf").type("zip").versionAsInProject()) .karafVersion("2.2.4").name("Apache Karaf")}; } @Test public void test() throws Exception { assertTrue(true); } }
5.16.2. Commands
Basically the Pax Exam - Karaf bridge introduced with 3.0 should support all commands you know from Pax Exam 2.x. In addition we’ve added various additional commands to make your life easier. Those commands are listed and explained in this sub section.
As a small remark: All of the Options explained here are also accessible via the static methods in the KarafDistributionOption class in the options package automatically on your classpath when you reference the container package.
KarafDistributionConfigurationOption
The framework itself is non of the typical runtimes you define normally in PAXEXAM. Instead you define a packed distribution as zip or tar.gz. Those distributions have to follow the Karaf packaging style. Therefore instead of Karaf you can also enter Servicemix or Geronimo.
new KarafDistributionConfigurationOption( "mvn:org.apache.karaf/apache-karaf/2.2.4/zip", // artifact to unpack and use "karaf", // name; display only "2.2.4") // the karaf version; this one is relevant since the startup script differs between versions
or for Servicemix e.g.
new KarafDistributionConfigurationOption( "mvn:org.apache.servicemix/apache-servicemix/4.4.0/zip", // artifact to unpack and use "servicemix", // name; display only "2.2.4") // the karaf version; this one is relevant since the startup script differs between versions
As an alternative you can also use the maven url resolvers. Please keep in mind that this only works starting with karaf-3.0.0 since there will be problems with the pax-url version. In addition, if you want to make use of the versionAsInProject part you also need to define the following maven-plugin in the pom file of your integration tests:
... <dependency> <groupId>org.apache.karaf</groupId> <artifactId>apache-karaf</artifactId> <type>zip</type> <classifier>bin</classifier> <scope>test</scope> </dependency> ... <plugin> <groupId>org.apache.servicemix.tooling</groupId> <artifactId>depends-maven-plugin</artifactId> <executions> <execution> <id>generate-depends-file</id> <goals> <goal>generate-depends-file</goal> </goals> </execution> </executions> </plugin>
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration().frameworkUrl( maven().groupId("org.apache.karaf").artifactId("apache-karaf").type("zip") .classifier("bin").versionAsInProject()) }; }
In addition to the framework specification options this option also includes various additional configuration options. Those options are used to configure the internal properties of the runtime environment.
Unpack Directory
Pax-Exam Testframework extracts the distribution you specify by default into the paxexam config directory. If you would like to unpack them into your target directory simply extend the KarafDistributionConfigurationOption with the unpackDirectoryFile like shown in the next example:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip") .unpackDirectory(new File("target/paxexam/unpack/")) }; }
Use Deploy Folder
Karaf distributions come by default with a deploy folder where you can simply drop artifacts to be deployed. In some distributions this folder might have been removed. To still be able to deploy your additional artifacts using default Pax Exam ProvisionOptions you can configure PaxExam Karaf to use a features.xml (which is directly added to your etc/org.apache.karaf.features.cfg) for those deploys. To use it instead of the deploy folder simply do the following:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip") .useDeployFolder(false)) }; }
KarafDistributionKitConfigurationOption
The KarafDistributionKitConfigurationOption is almost equal to all variations of the KarafDistributionConfigurationOption with the exception that it requires to have set a platform and optionally the executable and the files which should be made executable additionally. By default it is bin/karaf for nix platforms and bin\karaf.bat for windows platforms. The executable option comes in handy if you like to e.g. embed an own java runtime. You should add a windows AND a linux Kit definition. The framework automatically takes the correct one then. The following shows a simple example for karaf:
@Configuration public Option[] config() { return new Option[]{ new KarafDistributionKitConfigurationOption("mvn:org.apache.karaf/apache-karaf/${project.version}/zip", Platform.WINDOWS).executable("bin\\karaf.bat").filesToMakeExecutable("bin\\admin.bat"), new KarafDistributionKitConfigurationOption("mvn:org.apache.karaf/apache-karaf/${project.version}/tar.gz", "karaf", Platform.NIX).executable("bin/karaf").filesToMakeExecutable("bin/admin") }; }
KarafDistributionConfigurationFilePutOption
The option replaces or adds an option to one of Karaf’s configuration files:
new KarafDistributionConfigurationFilePutOption( "etc/config.properties", // config file to modify based on karaf.base "karaf.framework", // key to add or change "equinox") // value to add or change
This option could also be used in "batch-mode" via a property file. Therefore use the KarafDistributionOption#editConfigurationFilePut(final String configurationFilePath, File source, String… keysToUseFromSource) method. This option allows you to add all properties found in the file as KarafDistributionConfigurationFilePutOption. If you configure the "keysToUseFromSource" array only the keys specified there will be used. That way you can easily put an entire range of properties.
KarafDistributionConfigurationFileExtendOption
This one does the same as the KarafDistributionConfigurationFilePutOption option with the one difference that it either adds or appends a specific property. This is especially useful if you do not want to store the entire configuration in the line in your code.
This option could also be extended in "batch-mode" via a property file. Therefore use the KarafDistributionOption#editConfigurationFileExtend(final String configurationFilePath, File source, String… keysToUseFromSource) method. This option allows you to extend all properties found in the file as KarafDistributionConfigurationFileExtendOption. If you configure the "keysToUseFromSource" array only the keys specified there will be used. That way you can easily extend an entire range of properties.
KarafDistributionConfigurationFileReplacementOption
The file replacement option allows you to simply replace a file in you Karaf distribution with a different file:
new KarafDistributionConfigurationFileReplacementOption("etc/tests.cfg", new File( "src/test/resources/BaseKarafDefaultFrameworkDuplicatedPropertyEntryTestSecondKey"));
ProvisionOption
The new test container fully supports the provision option. Feel free to use any option provided here by paxexam itself (e.g. Maven resolver). All those artifacts are copied into the deploy folder of your Karaf distribution before it is started. Therefore they all will be available after startup.
KarafDistributionConfigurationConsoleOption
The test container supports options to configure if the localConsole and/or the remote shell should be started. Possible options to do so are shown in the following two examples:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), configureConsole().ignoreLocalConsole().startRemoteShell() }; }
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), configureConsole().startLocalConsole(), configureConsole().ignoreRemoteShell() }; }
VMOption
The Karaf container passes the vmOptions now through to the Karaf environment. They are directly passed to the startup of the container. In addition the KarafDistributionOption helper has two methods (debugConfiguration() and debugConfiguration(String port, boolean hold)) to activate debugging quickly.
LogLevelOption
The Paxexam-Karaf specific log-level option allows an easy way to set a specific log-level for the Karaf based distribution. For example simply add the following to your Option[] array to get TRACE logging:
import static org.openengsb.labs.paxexam.karaf.options.KarafDistributionOption.logLevel; ... @Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), logLevel(LogLevel.TRACE) }; }
DoNotModifyLogOption
The option to modify the logging behavior requires that the container automatically modifies the logging configuration file. If you would like to suppress this behavior simply set the doNotModifyLogConfiguration option as shown in the next example:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), doNotModifyLogConfiguration() }; }
KeepRuntimeFolderOption
Per default the test container removes all test runner folders. If you want to keep them for any reasons (e.g. check why a test fails) set the following option:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), keepRuntimeFolder() }; }
FeaturesScannerProvisionOption
The FeaturesScannerProvisionOption (e.g. CoreOption.scanFeature()) are directly supported by the Paxexam Karaf Testframework.
BootDelegationOption
The BootDelegationOption as known from PaxExam is also supported added the boot delegation string directly into the correct property files.
SystemPackageOption
The Standard Exam SystemPackageOption is implemented by adding those packages to "org.osgi.framework.system.packages.extra" of the config.properties file.
BootClasspathLibraryOption
The BootClasspathLibraryOption is honored by copying the urls into the lib directory where they are automatically taken and worked on.
ExamBundlesStartLevel
The ExamBundlesStartLevel can be used to configure the start lvl of the bundles provided by the test-frameworks features.xml. Simply use it as a new option like:
@Configuration public Option[] config() { return new Option[]{ karafDistributionConfiguration("mvn:org.apache.karaf/apache-karaf/${project.version}/zip"), useOwnExamBundlesStartLevel(4) }; }
5.16.3. Driver
Drivers are the parts of the framework responsible for running the Karaf Based Distribution. By default the already in the overview explained KarafDistributionConfigurationOption uses a JavaRunner starting the distribution platform independent but not using the scripts in the distribution. If you like to test those scripts too an option is to to use the ScriptRunner via the KarafDistributionKitConfigurationOption instead.
JavaRunner
The JavaRunner builds the entire command itself and executes Karaf in a new JVM. This behavior is more or less exactly what the default runner does. Simply use the KarafDistributionConfigurationOption as explained in the Commands section to use this.
ScriptRunner
The script runner has the disadvantage over the java runner that it is also platform dependent. The advantage though is that you can also test your specific scripts. To use it follow the explanation of the KarafDistributionKitConfigurationOption in the Commands section.
5.17. Github Contributions
Some people prefer to make contributions to karaf source via github. If you are one of them, this is for you!
5.17.1. Introduction
Apache Karaf is available as a periodically replicated mirror on: https://github.com/apache/karaf
5.17.2. Suggested Workflow
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Make a fork of karaf repo github mirror
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Do all your new work on your own karaf fork
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When ready, file a jira issue [https://issues.apache.org/jira/browse/KARAF], attach the link to your github pull request, and ask for a review
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One of karaf committers will discuss your pull request on github; and at some point your pull request will be accepted
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When your pull request is accepted, squash it into a single commit and attach single patch file to the original jira, with ASF grant check box selected
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Now pray to your favorite ASF committer to really accept the patch :-)
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When your patch is committed to the svn, and you can verify it in the latest karaf snapshot, close your pull request on github
5.17.3. License Reminder
in order for your contributions to be accepted:
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all files must contain ASL license grant header
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you must select ASF grant check box when attaching patch to the jira
5.17.4. How to Generate a One-File-Patch Via Throw-Away Branch
here is one way to generate squash of your commits:
# # 'archon' referers to karaf mirror # 'origin' referers to your own fork # # attach karaf mirror as remote, if not done yet git remote add archon https://github.com/apache/karaf # fetch latest karaf mirror git fetch archon # ensure you are on your fork trunk git checkout origin/trunk # kill previous patch delivery, if you had one git branch -D delivery # make new delivery throw-away branch, based on latest karaf mirror git branch delivery archon/trunk # use it git checkout delivery # squash all your local development into a single commit git merge --squash trunk # commit it to the delivery branch git commit -m "delivery" # generate a patch file against the mirror git format-patch archon/trunk
root of your karaf source now contains a file named "0001-delivery.patch.txt" (please attach the .txt ending;this will allow commiters to open your patch directly in the browser and give it a short look there) which you should attach to your karaf jira, and ask to commit to the svn trunk