Persistent Volume Claims in Kubernetes

Persistent Volume Claim to make the storage available to a node.

Persistent Volumes are resources in the cluster. Persistent Volume Claims are requests for those resources and also act as claim checks to the resource.

Persistent Volume and Persistent Volume Claims are two separate objects in the Kubernetes namespace. An administrator creates a set of Persistent Volumes and a user creates Persistent Volume Claims to use to storage. Once the persistent volume claims based on the request and properties set on the volume. Every Persistent Volume Claims is bound to a single persistent volume during the binding process Kubernetes tries to find a persistent volume that has sufficient capacity as requested by the claim and any other request properties such as access modes volume mode storage class etc.

There is a one to one relationship between Persistent Volume Claims and Persistent Volume so no other claims can utilize the remaining capacity in the volume.

If there are no volumes available the persistent volume claim will remain in a pending state until newer volumes are made available to the cluster. Once newer volumes are available, the claim would automatically be bound to the newly available volume.

Persistent Volume Claim

apiVersion: v1
kind: PersistentVolumeClaim
  name: pvc-sample
    - ReadWriteOnce
      storage: 500Mi
$ kubectl create -f pvc-sample.yaml 
persistentvolumeclaim/pvc-sample created
$ kubectl get pvc
NAME         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
pvc-sample   Bound    pvc-bd57fd7b-3ec8-452d-9c05-4687585ff9ea   500Mi      RWO            hostpath       43s
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