How to mitigate an OpenStack environment outage to prepare for replacing a controller?

Solution Verified - Updated -

Issue

  • A controller went down and is not recoverable.
  • The OS is corrupt on a controller.
  • A controller needs to be replaced in the environment, but time is needed to schedule a maintenance window and prepare for the activity.
  • How to restore service to an HA environment that has lost one controller?

Environment

  • Red Hat OpenStack Platform 8.0

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