Resizing persistent volumes after after initial install
Before getting started with resizing persistent volumes, you’ll need the following in advance:
Ensure line “allowVolumeExpansion: true” exists in the default storage class. If this does not already exist in the default storage class, this can be done by editing the default storage class:
Find the default storage class by running kubectl get storageclass it will have (default) next to it.
Edit the storage class kubectl edit storageclass <NAME> and add allowVolumeExpansion: true so it looks like the following:
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: standard
parameters:
type: pd-standard
provisioner: kubernetes.io/gce-pd
allowVolumeExpansion: true
reclaimPolicy: Delete
Currently as of Kubernetes 1.16, it is not possible to resize the disks of a StatefulSet by editing the StatefulSet, instead each PVC used by the StatefulSet pods needs to be edited and deleted for the new size to take affect:
Patch each PVC replacing <PVC_NAME> with the PVC to be resized and <NEW_SIZE> with the new disk size: kubectl --namespace=<NAMESPACE> patch pvc <PVC_NAME> -p '{"spec":{"resources":{"requests":{"storage":"<NEW_SIZE>Gi"}}}}'
Delete the pods associated with the edited PVCs: kubectl --namespace=<NAMESPACE> delete pod <POD_NAME> - This step is optional if the cloud provider backing the disks supports resizing without pod restarts.
Recreate the StatefulSet to keep things consistent by first deleting the StatefulSet without deleting the Pods and causing further downtime:
kubectl --namespace=<NAMESPACE> delete --cascade=orphan statefulset <STATEFUL_SET_NAME>
Storage section by reconfiguring BugSnag and deploy the config change.