How I can update my jvm options for my container configured with a fabric?

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Issue

By default, the default Max PermGen Space of a karaf instance is set to 85M (checked with JConsole)when using the Oracle JVM. How do I change this value?
How to change jvmOpts for already running child container in fabric ?
How to set max heap memory for existing fabric container? Receiving OutOfMemory error.

Environment

Red Hat JBoss Fuse
- 6.1.0

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