[18-stable] Add PodDisruptionBudget for Galera to prevent quorum loss during rolling reboots - #529
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openshift-merge-bot[bot] merged 1 commit intoJul 31, 2026
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…ing reboots During an OCP MCP rolling reboot, MCO drains nodes sequentially but does not wait for application pods to become Ready on the previous node before draining the next one. For Galera on a compact (3-node) cluster, this causes quorum loss: the pod on the just-rebooted node is still in Init while the pod on the next node is already being evicted, leaving only 1/3 members running. Add a PodDisruptionBudget with maxUnavailable=1, matching the pattern used by infra-operator for RabbitMQ. This ensures MCO's drain is blocked until all but one Galera pod are Ready, preventing the overlapping disruption window that causes quorum loss. The PDB is only created when replicas > 1 and is cleaned up when scaling down to a single replica. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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merged commit Jul 31, 2026
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This is an automated cherry-pick of #512
/assign lmiccini