Missing node list in Overview section of a managed cluster on Red Hat Advanced Cluster Management post restoration via OADP

Solution Verified - Updated -

Environment

  • Red Hat Advanced Cluster Management (RHACM) for Kubernetes
    • 2.10

Issue

  • Managed cluster nodes are not being displayed in the Overview page of Cluster hosts section.
  • Post backup and restoration nodes are not visible on ACM GUI under Cluster hosts.
  • Under Cluster hosts section ACM GUI shows Waiting for hosts...

Resolution

  • Features specific to agent restore would not work in ACM 2.10 as they do in ACM 2.12.

  • ACM 2.10 version doesn't have the built-in mechanisms to handle agent restoration.

  • As per the Business continuity documentation for ACM 2.10, backup and restore of all relevant CRs should be manually saved and applied.

Root Cause

  • The agent CR were not backed up which needed to be done manually saved in ACM 2.10.
  • The restore agent CR was missing in the service DB with a missing host record hence the service simply deleted the agent CR and the associated host in DB was detected as missing.

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