How do I set the JVM args for sub-instance of karaf?

[peter lawrey]

We have a number of instances of karaf which are sub-instances of the
main instance.

How do we set command line arguments like `admin:start -o` does?

e.g. 

-Dcom.sun.management.jmxremote.port=9004

 

We want this to be set when the services are restarted automatically.