docs/doc/source/storage/kubernetes/storage-configuration-create-persistent-volume-claims.rst

Create Persistent Volume Claims

Container images have an ephemeral file system by default. For data to survive beyond the lifetime of a container, it can read and write files to a persistent volume obtained with a created to provide persistent storage.

The following steps create two 1Gb persistent volume claims.

1. Create the test-claim1 persistent volume claim.

   1. Create a yaml file defining the claim and its attributes.

      For example:

      ~(keystone_admin)]$ cat <<EOF > claim1.yaml
      kind: PersistentVolumeClaim
      apiVersion: v1
      metadata:
        name: test-claim1
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
        storageClassName: general
      EOF

   2. Apply the settings created above.

      ~(keystone_admin)]$ kubectl apply -f claim1.yaml
      
      persistentvolumeclaim/test-claim1 created

2. Create the test-claim2 persistent volume claim.

   1. Create a yaml file defining the claim and its attributes.

      For example:

      ~(keystone_admin)]$ cat <<EOF > claim2.yaml
      kind: PersistentVolumeClaim
      apiVersion: v1
      metadata:
        name: test-claim2
      spec:
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
        storageClassName: general
      EOF

   2. Apply the settings created above.

      ~(keystone_admin)]$ kubectl apply -f claim2.yaml
      persistentvolumeclaim/test-claim2 created

Two 1Gb persistent volume claims have been created. You can view them with the following command.

~(keystone_admin)]$ kubectl get persistentvolumeclaims
NAME          STATUS   VOLUME      CAPACITY   ACCESS MODES   STORAGECLASS   AGE
test-claim1   Bound    pvc-aaca..  1Gi        RWO            general        2m56s
test-claim2   Bound    pvc-e93f..  1Gi        RWO            general        68s

For more information on using CephFS for internal Ceph backends, see, Using CephFS for Internal Ceph Storage Backend <configure-ceph-file-system-for-internal-ceph-storage-backend>