FFU upgrade of the overcloud nodes failing with error:ComputeHostNotFound_Remote

Solution Verified - Updated -

Issue

Multiple issues during FFU process

  • Error message while overcloud upgrade:

    Error processing default value old_undercloud.localdomain for Opt type 
    of HostAddress.
    
  • Undercloud hostname changed from old_undercloud.localdomain to new-undercloud.localdomain considering the usage of special character "_" underscore which is invalid DNS entry.

  • This change led the undercloud upgrade successfully pass from RHOSP11 to RHOSP12
  • But later observed issue during overcloud upgrade.

  • From /var/log/nova/nova-compute.log its pointing towards the hostname change which was done before

    2020-04-22 03:03:42.920 4796 ERROR nova.compute.manager [req- 
    22703e39-ee46-4109-bea8-dab9d0b6c53e - - - - -] No compute node 
    record for host new-undercloud.localdomain: 
    ComputeHostNotFound_Remote: Compute host new- 
    undercloud.localdomain could not be found.
    
  • Also noticed openstack overcloud profile list empty after undercloud upgrade

Environment

  • Red Hat OpenStack Platform 10
  • Red Hat OpenStack Platform 13

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