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Volume Cloning Example

Feature Status: Beta

  • supported from v1.23.2
  • NFSv3 protocol is not supported

Prerequisites

  • Make sure that the virtual network, where the driver controller pod is deployed, is added to the allowed list of the storage account's VNet setting.
  • Before proceeding, ensure that the application is not writing data to the source volume.
  • In order to allow the use of a managed identity, the source storage account requires the Storage Blob Data Reader role, while the destination storage account requires the Storage Blob Data Contributor role. If the Storage Blob Data role is not granted, the CSI driver will use a SAS token as a fallback.

Create a Source PVC

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/storageclass-blobfuse2.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/pvc-blob-csi.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/nginx-pod-blob.yaml

Check the Source PVC

$ kubectl exec nginx-blob -- ls /mnt/blob
outfile

Create a PVC from an existing PVC

Make sure application is not writing data to source blob container

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/cloning/pvc-blob-csi-cloning.yaml

Check the Creation Status

$ kubectl describe pvc pvc-blob-cloning
Name:          pvc-blob-cloning
Namespace:     default
StorageClass:  blob-fuse
Status:        Bound
Volume:        pvc-6db5af93-3b32-4c24-a68e-b727d7801fd5
Labels:        <none>
Annotations:   kubectl.kubernetes.io/last-applied-configuration:
                 {"apiVersion":"v1","kind":"PersistentVolumeClaim","metadata":{"annotations":{},"name":"pvc-blob-cloning","namespace":"default"},"spec":{"a...
               pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: blob.csi.azure.com
               volume.kubernetes.io/storage-provisioner: blob.csi.azure.com
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      100Gi
Access Modes:  RWX
VolumeMode:    Filesystem
Mounted By:    <none>
Events:
  Type    Reason                 Age                From                                                                                       Message
  ----    ------                 ----               ----                                                                                       -------
  Normal  Provisioning           16s                blob.csi.azure.com_aks-nodepool1-34988195-vmss000002_8ecdf8ad-b636-4ca5-81ee-0f1a49337168  External provisioner is provisioning volume for claim "default/pvc-blob-cloning"
  Normal  ExternalProvisioning   14s (x3 over 16s)  persistentvolume-controller                                                                waiting for a volume to be created, either by external provisioner "blob.csi.azure.com" or manually created by system administrator
  Normal  ProvisioningSucceeded  8s                 blob.csi.azure.com_aks-nodepool1-34988195-vmss000002_8ecdf8ad-b636-4ca5-81ee-0f1a49337168  Successfully provisioned volume pvc-6db5af93-3b32-4c24-a68e-b727d7801fd5

Restore the PVC into a Pod

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/cloning/nginx-pod-restored-cloning.yaml

Check Sample Data

$ kubectl exec nginx-blob-restored-cloning -- ls /mnt/blob
outfile