Kubernetes PVC expansion: kubectl patch pvc

Expand your pvc size.

1) List your PVCs:

kubectl get pvc -A

NAMESPACE    NAME                                          STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
dev          elasticsearch-master-elasticsearch-master-0   Bound    pvc-25c6e973-8fc4-463b-9288-123456678903   30Gi       RWO            standard       2y234d

2) Review your StorageClass has AllowVolumeExpansion configured to true.

kubectl describe sc standard | grep AllowVolumeExpansion
AllowVolumeExpansion:  True

3) Request new size

• kubectl -n your-namespace patch pvc your-pvc-name -p '{"spec":{"resources":{"requests":{"storage":"16Gi"}}}}'

4) Verify it

kubectl get pvc YOURPVC

Outputs

 kubectl -n yournamespace patch pvc yourstoragename -p '{"spec":{"resources":{"requests": 
{"storage":"1Gi"}}}}' 
The PersistentVolumeClaim "yourstoragename" is invalid: 
* spec: Forbidden: spec is immutable after creation except resources.requests for bound 
claims
  core.PersistentVolumeClaimSpec{
        AccessModes: {"ReadWriteOnce"},
        Selector:    nil,
        Resources: core.ResourceRequirements{
                Limits: nil,
-               Requests: core.ResourceList{
-                       s"storage": {i: resource.int64Amount{value: 123456}, s: "1Gi", 
Format: "BinarySI"},
-               },
+               Requests: core.ResourceList{
+                       s"storage": {i: resource.int64Amount{value: 123456}, s: "5Gi", 
Format: "BinarySI"},
+               },
        },
        VolumeName:       "",
        StorageClassName: &"yourclass",
        ... // 3 identical fields
  } 

* spec.resources.requests.storage: Forbidden: field can not be less than previous value

Related

• kubectl get storageclass
• kubectl patch pvc
• FileSystemResizeSuccessful MountVolume.NodeExpandVolume succeeded for volume "pvc-678509b5-158b-11e9-8abc-1234567890"
• The PersistentVolumeClaim XXX is invalid

Activities

• Read https://www.gooksu.com/2022/08/how-to-increase-space-for-your-elasticsearch-instances-in-k8s-on-eck/
• Read https://www.percona.com/blog/percona-operator-volume-expansion-without-downtime/

See also

• Kubernetes Persistent Volume Claim (PVC) (kind: PersistentVolumeClaim), Kubernetes Persistent volumes (PV) (kind: PersistentVolume), kubectl describe pvc, kubectl get pvc, ClaimLost, ProvisioningSucceeded, PV access control, PersistentVolumeClaimRetentionPolicy
• Kubernetes storage, storage classes, PersistentVolume (PV), PVC, CSI, kind: StorageClass, kind: PersistentVolumeClaim, kind: PersistentVolume, kubectl [ get | describe | edit ] pvc, volumeClaimTemplates:, kubectl patch pv, FailedMount, Volume Expansion, Volume Cloning, snapshots, ExtraVolumes, NotTriggerScaleUp, volumePVCDataSource, AllowVolumeExpansion, EKS storage, provisioner, Storage Capacity Tracking, VolumeBinding, VolumeClaimTemplate, storage.k8s.io, CKA Storage, DoKC, emptyDir, Volume populators, storageclass.kubernetes.io, Rook, Longhorn, projected volumes