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02 - Expanding PVC Storage Size.md

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Expanding PVC Storage Size

Expanding PVC Storage Size depends upon the StorageClasses being used.

Edit any existing or create a StorageClass with allowVolumeExpansion field set to true

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: standard
provisioner: kubernetes.io/aws-ebs
parameters:
  type: gp2
reclaimPolicy: Retain
allowVolumeExpansion: true      # <--- this should be true
mountOptions:
  - debug
volumeBindingMode: Immediate

The following types of volumes support volume expansion, when the underlying StorageClass has the field allowVolumeExpansion set to true.

Volume type Required Kubernetes version
gcePersistentDisk 1.11
awsElasticBlockStore 1.11
Cinder 1.11
glusterfs 1.11
rbd 1.11
Azure File 1.11
Azure Disk 1.11
Portworx 1.11
FlexVolume 1.13
CSI 1.14 (alpha), 1.16 (beta)

Resize a existing PVC named myclaim

kubectl patch pvc myclaim -p '{"spec":{"resources":{"requests":{"storage":"10Gi"}}}}'

Points to note -

  • only dynamically provisioned pvc can be resized
  • the storageclass that provisions the pvc must support resize
Error from server (Forbidden): persistentvolumeclaims "myclaim" is forbidden: only dynamically provisioned pvc can be resized and the storageclass that provisions the pvc must support resize
  • storage size can only be increased
The PersistentVolumeClaim "myclaim" is invalid: spec.resources.requests.storage: Forbidden: field can not be less than previous value