Increase PV size

Resizing PVs with “normal” PVCs should be no problem, see the Kubernetes documentation

VolumeClaimTemplates¶

It’s differently with StatefulSets having VolumeClaimTemplates though.

Instruction taken from: https://serverfault.com/a/989665

1. kubectl edit pvc <name> for each PVC in the StatefulSet, to increase its capacity.
2. kubectl delete sts --cascade=orphan <name> to delete the StatefulSet and leave its pods.
3. kubectl apply -f <name> to recreate the StatefulSet.
4. (May be optional, check the PVC in the running pod)kubectl rollout restart sts <name> to restart the pods, one at a time. During restart, the pod’s PVC will be resized.

If you want to monitor what’s happening, run two more shell windows with these commands, before any of the commands above:

• kubectl get pod -w
• kubectl get pvc -w

Prometheus¶

For the Prometheus CDR (prometheuses.monitoring.coreos.com), it’s slightly different.

1. Increase spec.storage.volumeClaimTemplate.spec.resources.requests.storage to the desired size
2. Manually increase PVC size
3. ???
4. Profit

The Prometheus Operator does all the other stuff like recreating the StatefulSet and restarting the Pods by itself.

Other¶

https://kubernetes.io/blog/2018/07/12/resizing-persistent-volumes-using-kubernetes/