Using JMX to monitor and administer Apache Karaf

#
# Port number for RMI registry connection
#
rmiRegistryPort = 11099

#
# Port number for RMI server connection
#
rmiServerPort = 44445

The default ports, 1099 and 44444, are usually fine for general deployment. Change these ports only if you are experiencing port conflicts on your deployment. Now, consider the following snippet:

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# Role name used for JMX access authorization
# If not set, this defaults to the ${karaf.admin.role} configured in etc/system.properties
#
jmxRole=admin

Towards the bottom of the configuration file, there will be a commented-out entry for jmxRole; enable this by removing the hash character.

karaf = karaf,_g_:admingroup
_g_\:admingroup = group,admin,manager,viewer,jmxRole

The users.properties file is used to configure users, groups, and roles in Karaf. We append jmxRole to the admin group. The syntax for this file follows the Username = password, groups format.

After restarting Karaf, use a JMX-based admin tool of your choice (the previous screenshot shows JConsole) to connect to the container. Due to image size restrictions, the full URL couldn't be displayed. The full URL is service:jmx:rmi://127.0.0.1:44445/jndi/rmi://127.0.0.1:11099/karaf-root. The syntax of the URL is service:jmx:rmi://host:${rmiServerPort}/jndi/rmi://host:${rmiRegistryPort}/${karaf-instance-name}.