Dynamic Volume Provisioning Example Using a Pod

A PersistentVolumeClaim is a request for abstract storage resources by a user. The PersistentVolumeClaim would then be associated to a Pod resource to provision a PersistentVolume, which would be backed by a Lightbits volume.

An optional volumeMode can be included to select between a mounted file system (default) or raw block device-based volume.

Using the lb-csi-plugin, specifying Filesystem for volumeMode can support ReadWriteOnce accessMode claims, and specifying Block for volumeMode can support ReadWriteOnce accessMode claims.

Filesystem Volume Mode PVC

The file examples/filesystem-workload.yaml provided with the Supplementary Package contains two manifests:

1. PVC named example-fs-pvc referencing example-sc StorageClass created above.
2. POD named example-fs-pod binding to example-fs-pvc.

Deploying PVC and POD

To deploy the PVC and the POD, run:

kubectl apply -f examples/filesystem-workload.yaml

persistentvolumeclaim/example-fs-pvc created

pod/example-fs-pod created

Verifying Deployment

Using the following command we will see the PV, PVC resources in Bound status and POD in READY state.

kubectl get pv,pvc,pod

NAME                                                        CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                    STORAGECLASS   REASON   AGE

persistentvolume/pvc-7680be61-0694-44cf-9d1b-1f69827d0b4b   10Gi       RWO            Delete           Bound    default/example-fs-pvc   example-sc              69s

​

NAME                                   STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE

persistentvolumeclaim/example-fs-pvc   Bound    pvc-7680be61-0694-44cf-9d1b-1f69827d0b4b   10Gi       RWO            example-sc     70s

​

NAME                 READY   STATUS    RESTARTS   AGE

pod/example-fs-pod   1/1     Running   0          70s

Deleting PVC and POD

kubectl delete -f examples/filesystem-workload.yaml

persistentvolumeclaim "example-fs-pvc" deleted

pod "example-fs-pod" deleted

Block Volume Mode PVC

The file examples/block-workload.yaml provided with the Supplementary Package contains two manifests:

1. PVC named example-block-pvc referencing example-sc StorageClass created above.
2. POD named example-block-pod binding to example-block-pvc.

You can follow the same flow described in the Filesystem Volume Mode PVC section above, to deploy the block volume-mode example.