Create PVC across Kubernetes workers

HA MSR requires a Persistent Volume Claim (PVC) that can be shared across all worker nodes.

Note

MSR 4 can use any StorageClass and PVC that you configure on your Kubernetes cluster. The following examples set up cephfs or NFS as your default StorageClass. For more information, see Storage Classes in the official Kubernetes documentation.

Configure cephfs

The following example shows how to configure persistent storage for Kubernetes using cephfs. You can adapt these steps for your environment.

1. Create a StorageClass, the specifics of which depend on the storage backend you are using. The following example illustrates how to create a StorageClass class with a CephFS backend and Ceph CSI:

   apiVersion: storage.k8s.io/v1
   kind: StorageClass
   metadata:
     name: cephfs
     annotations:
      storageclass.kubernetes.io/is-default-class: "true"
   provisioner: cephfs.csi.ceph.com
   parameters:
     clusterID: <cluster-id>
   

2. Run kubectl apply to apply the StorageClass configuration to the cluster, in the appropriate namespace.

3. Create the PVC:

   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: shared-pvc
   spec:
     accessModes:
       - ReadWriteMany
     resources:
       requests:
         storage: 10Gi
     storageClassName: cephfs
   

   Note

   The .spec.storageClassName references the name of the StorageClass you created above.

4. Run kubectl apply to apply PVC to the cluster, in the appropriate namespace.

Configure NFS

The following example shows how to configure persistent storage for Kubernetes using NFS. You can adapt these steps for your environment.

1. Add the Helm repository for the NFS subdirectory external provisioner.

   helm repo add nfs-provisioner https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner/
   helm repo update
   

2. Install the NFS client provisioner. Replace the placeholders with values for your environment.

   helm install nfs-client-provisioner nfs-provisioner/nfs-subdir-external-provisioner \
     --set nfs.server=<NFS-SERVER-IP> \
     --set nfs.path=</DIRECTORY/YOU/WANT/TO/USE> \
     --set storageClass.name=nfs-storage \
     --set storageClass.defaultClass=true