Rollback/Recovery Procedure in case Kubernetes Cluster Upgrade Fails

Problem

Is there a procedure to rollback or recover in case of a PMK Kubernetes Cluster Upgrade failure?

Environment

• Platform9 Managed Kubernetes - All Versions

Answer

1. Platform9 Managed Kubernetes does not support the process of rolling back a cluster upgrade to the previous version.
2. With regards to cluster upgrade itself, since nodes in the cluster are upgraded in a rolling fashion i.e. one at a time, it ensures that the last upgraded node is healthy before upgrading the next one ensuring that the applications do not experience any downtime during the cluster upgrade, as long as they tolerate the failure of a single node.
3. In case of any failure on a node undergoing upgrade, the process is to fix the issue and move forward by retrying the upgrade on the node.