Checking etcd certificate expiry in OpenShift 4

Solution Verified - Updated -

Issue

  • The etcd certificates are not automatically rotated/refreshed in OpenShift versions before 4.9, causing cluster-wide outage when expired.
  • How to check etcd certificate expiry and renew them before expiry?
  • How to check etcd certificate expiry before shutting down an OpenShift cluster.

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • etcd certificates

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