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README.md

Snapshot feature

From version 1.26.4, you can take cross-region snapshots by setting the location parameter to a different region than the current cluster

Introduction

This driver supports both full and incremental snapshot functionalities, you could set incremental parameter in VolumeSnapshotClass to set full or incremental(by default) snapshot(refer to VolumeSnapshotClass for detailed parameters description):

apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotClass
metadata:
  name: csi-azuredisk-vsc
driver: disk.csi.azure.com
deletionPolicy: Delete
parameters:
  resourceGroup: EXISTING_RESOURCE_GROUP_NAME  # optional, only set this when snapshot is not taken in the same resource group as agent node
  incremental: "true"  # available values: "true"(by default), "false"

Install CSI Driver

Follow the instructions to install snapshot driver.

1. Create source PVC and an example pod to write data

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/storageclass-azuredisk-csi.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/pvc-azuredisk-csi.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/nginx-pod-azuredisk.yaml
  • Check source PVC
$ kubectl exec nginx-azuredisk -- ls /mnt/azuredisk
lost+found
outfile

2. Create a snapshot on source PVC

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/snapshot/storageclass-azuredisk-snapshot.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/snapshot/azuredisk-volume-snapshot.yaml
  • Check snapshot Status
$ kubectl describe volumesnapshot azuredisk-volume-snapshot
Name:         azuredisk-volume-snapshot
Namespace:    default
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"snapshot.storage.k8s.io/v1","kind":"VolumeSnapshot","metadata":{"annotations":{},"name":"azuredisk-volume-snapshot","n...
API Version:  snapshot.storage.k8s.io/v1
Kind:         VolumeSnapshot
Metadata:
  Creation Timestamp:  2020-02-04T13:59:54Z
  Finalizers:
    snapshot.storage.kubernetes.io/volumesnapshot-as-source-protection
    snapshot.storage.kubernetes.io/volumesnapshot-bound-protection
  Generation:        1
  Resource Version:  48044
  Self Link:         /apis/snapshot.storage.k8s.io/v1/namespaces/default/volumesnapshots/azuredisk-volume-snapshot
  UID:               2b0ef334-4112-4c86-8360-079c625d5562
Spec:
  Source:
    Persistent Volume Claim Name:  pvc-azuredisk
  Volume Snapshot Class Name:      csi-azuredisk-vsc
Status:
  Bound Volume Snapshot Content Name:  snapcontent-2b0ef334-4112-4c86-8360-079c625d5562
  Creation Time:                       2020-02-04T14:23:36Z
  Ready To Use:                        true
  Restore Size:                        10Gi
Events:                                <none>

In above example, snapcontent-2b0ef334-4112-4c86-8360-079c625d5562 is the snapshot name

3. Create a new PVC based on snapshot

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/snapshot/pvc-azuredisk-snapshot-restored.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/deploy/example/snapshot/nginx-pod-restored-snapshot.yaml
  • Check data
$ kubectl exec nginx-restored -- ls /mnt/azuredisk
lost+found
outfile

Tips

Use snapshot feature to create a copy of a disk with a different SKU

It is possible to change the disk SKU from LRS to ZRS, from standard to premium, and even across zones, but it is not supported to change the disk SKU across regions.

For information on storage class settings with cross-zone support, please refer to allowed-topology storage class

  • Before proceeding, ensure that the application is not writing data to the source disk.
  • Take a snapshot of the existing disk PVC.
  • Create a new storage class, such as "new-sku-sc," with the desired SKU name value
  • Create a new PVC with the storage class name "new-sku-sc" based on the snapshot.

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