StatefulSet PODs Not Getting Deleted After Helm Upgrade

Problem

• After helm upgrade the statefulset gets upgraded but POD were not re-created

Environment

• Platform9 Managed Kubernetes -- All version

Cause

• Statefuset updateStrategy is set to "OnDelete"
• The Statefulset 'upgradeStrategy' field is set to type 'OnDelete'

updateStrategy:

    type: OnDelete

  volumeClaimTemplates:

  - apiVersion: v1

    kind: PersistentVolumeClaim

    metadata:

      creationTimestamp: null

      name: imcdiamstorage

Resolution

• There are two ways to overcome this issue

1. Delete the statefulset's POD's manually after helm upgrade
2. Set the 'upgradeStrategy' field to type 'RollingUpgrade'

Additional Information

• Check Kubernetes Documentation for StatefulSet Upgrade Strategy