Add option to revert Controller Cluster to Standalone Controller

Feature

• There can be situations when a Controller Cluster should be converted to act as a Standalone Controller:
  • In case of an architecture decision to continue with a Standalone Controller.
  • In case of severe loss of journal data, for example if journals of both one of the Controller instances and of the Cluster Watch Agent have not been consistently written to disk or are not available after a server crash or file system crash.
• Converting a Controller Cluster to a Standalone Controller offers to re-instate the Cluster at any later point in time
• Users have to perform two operations to revert a Controller Cluster:
  • Switch the Controller Type in the JOC Cockpit GUI from "Cluster" to "Standalone"
  • Run the Controller instance's Instance Start Script with the revert command:

  • ./controller_instance.sh revert