What is the correct way to recover from Total Compute Node Failure?

Solution Verified - Updated -

Issue

  • While testing a host marked as offline (for testing failures on HW, etc) what's the correct procedure to have the instances to be rebooted on the surviving nodes.
  • Not having the Compute HA configured.
  • This is not Nova planned maintenance.

Environment

  • Red Hat Entrerpise Linux OpenStack Platform 6 '(Juno Based).
  • Red Hat Entrerpise Linux OpenStack Platform 7 '(Kilo Based).
  • Red Hat OpenStack Platform 8 '(Liberty Based).

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