You can connect to a remote Karaf's console using the ssh:ssh command.
karaf@trun> ssh:ssh -l tadmin -P tadmin -p 8101 hostname
Warning: The default password is tadmin but we recommend changing it. See Security for more information.
To confirm that you have connected to the correct Karaf instance, type
shell:info at the karaf> prompt.
Information about the currently connected instance is returned, as shown.
Karaf Karaf home /local/apache-karaf-2.0.0 Karaf base /local/apache-karaf-2.0.0 OSGi Framework org.eclipse.osgi - 3.5.1.R35x_v20090827 JVM Java Virtual Machine Java HotSpot(TM) Server VM version 14.1-b02 ...