Longhorn instance-manager upgrade in a Homelab setting

My kubernetes based homelab was recently borked by a myriad of issues plaguing the Longhorn release 1.11.0. 

  • https://github.com/longhorn/longhorn/issues/12578 - borked validating webhook
  • https://github.com/longhorn/longhorn/issues/12573 - memory leak
Both requires manual bumping Longhorn to a hotfix image. 

When bumping the instance-manager, existing volumes still using the old instance-manager will persist until volume is detached. 

The official Longhorn document suggested scaling the workload down to achieve that outcome. 

Personally I find that suggestion flawed, while I do have ArgoCD which helps reconcile the configuration, I don't want to manually update the deployment count. 

Turns out, I can manage the same result through node drain - which forces workload to be moved to a different node. 

Granted - I don't have a fool-proof disruption budget set, so some workloads are interrupted; and all of my volumes are RWX. But I'll take this much simpler approach to manually scaling down/up each workload. 

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