Operations

Increase the storage sizes without downtime

We cannot update the resources.storageSize of the StatefulSet to increase the volume sizes. So, we have to follow a few steps to update them.

See this article for more details.

1. Confirm if the storageclass of persistent volumes has .allowVolumeExpansion=true

   > kubectl get storageclass standard -o yaml | yq .allowVolumeExpansion
   true
   ```

2. Update all PVC to have more storage sizes

3. Delete the statefulset objects without deleting pods by kubectl delete statefulset $statefulset_name --cascade=orphan

4. Recreate the statefulset with the new storage size

Decrease the storage size

Shrinking disk sizes is not supported. official document.