PodDisruptionBudget (PDB) could cause Machine-Config-Operator (MCO) to be degraded during OCP4 upgrade

Solution In Progress - Updated -

Issue

  • OCP4 upgrade is failing due to machine-config-operator degraded.
  • Log message errors in machine-config-server-xxxxx pod.
I0220 00:00:00.000000   49566 update.go:89] error when evicting pod "<pdb_name>" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4.x

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