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 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.
Create the rwx-test-claim Persistent Volume Claim.
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
Apply the settings created above.
~(keystone_admin)]$ kubectl apply -f rwx-claim.yaml persistentvolumeclaim/rwx-test-claim created
1GB PVC has been created. You can view the PVCs 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
For more information on using CephFS for internal Ceph backends, see, StarlingX Storage Configuration and Management About Persistent Volume Support.