Kubernetes Persistent Volume Claim (PVC)

• https://kubernetes.io/docs/concepts/storage/persistent-volumes/

• kubectl get pvc
• kubectl get pvc -o yaml
• kubectl describe pvc mysql-pv-claim
• kubectl describe pvc grafana
• kubectl patch pvc

kind: PersistentVolumeClaim
kind: PersistentVolume
kind: StorageClass

error: persistentvolumeclaims "your-elasticsearch-master-0" could not be patched: persistentvolumeclaims "your-elasticsearch-master-0" is forbidden: only dynamically provisioned pvc can be resized and the storageclass that provisions the pvc must support resize.

ProvisioningFailed

PVC types

• gcePersistentDisk
• Cinder (OpenStack)
• glusterfs
• rbd - Ceph RBD
• Azure File
• Azure Disk
• Portworx
• FlexVolumes
• Container Storage Interface (CSI)

Examples

Volume expansion

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: myclaim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi # specify new size here

kubectl apply -f your_new_pvc.yml
persistentvolumeclaim/myclaim created

Errors

• FailedScheduling .../... Pod has unbound immediate PersistentVolumeClaims

Related terms

• Kubernetes Persistent Volumes (PV): kind: PersistentVolume
• kind: StorageClass
• kubectl describe deployment | grep PersistentVolumeClaim
• aws ec2 describe-volumes | grep -A1 Name
• awsElasticBlockStore
• kubectl get volumesnapshot
• K8up Kubernetes Backup Operator
• kind: Provisioner
• volumes:
• Kubernetes HostPath volume provider
• Data on Kubernetes Community (DoKC)
• DiskPressure
• persistentvolumeclaim "yourpvname" not found.

Activities

• CKA v1.23: Understand persistent volume claims primitive
• Create a PersistentVolumeClaim
• Read https://cloud.google.com/kubernetes-engine/docs/concepts/persistent-volumes

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
• 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
• DoKC, Kubernetes storage, PVC