Create ReadWriteMany 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 Persistent Volume Claim (PVC) created to provide persistent storage.

About this task

For multiple containers to mount the same PVC, create a PVC with accessMode of ReadWriteMany (RWX).

The following steps show an example of creating a 1GB PVC with ReadWriteMany accessMode.

Procedure

Create the rwx-test-claim Persistent Volume Claim.

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

   For example:

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

2. Apply the settings created above.

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

This results in 1GB PVC being created. You can view the PVC using the following command.

~(keystone_admin)]$ kubectl get persistentvolumeclaims

NAME              STATUS   VOLUME       CAPACITY   ACCESS MODES   STORAGECLASS
rwx-test-claim    Bound    pvc-df9f..   1Gi        RWX            cephfs

~(keystone_admin)]$ kubectl get persistentvolume
NAME       CAPACITY ACCESS.. RECLAIM.. STATUS CLAIM                   STORAGECLASS
pvc-df9f.. 1Gi      RWX       Delete    Bound  default/rwx-test-claim  cephfs