Configuring a Volume Snapshot

Creating a Volume Snapshot Class

VolumeSnapshotClass provides a way to describe the “classes” of storage when provisioning a VolumeSnapshot. Each VolumeSnapshotClass contains the driver, deletionPolicy, and parameters fields, which are used when a VolumeSnapshot belonging to the class needs to be dynamically provisioned.

The name of a VolumeSnapshotClass object is significant, and is how users can request a particular class. Administrators set the name and other parameters of a class when first creating VolumeSnapshotClass objects, and the objects cannot be updated once they are created.

The following is an example of a VolumeSnapshotClass used by Huawei CSI:

apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshotClass
metadata:
  name: mysnapclass
driver: csi.huawei.com
deletionPolicy: Delete

You can modify the parameters according to Table 1 . Currently, Huawei CSI does not support user-defined parameters (parameters) in a VolumeSnapshotClass. Therefore, you are advised to create a VolumeSnapshotClass for all snapshots.

Table 1 VolumeSnapshotClass parameters

Procedure

1. Run the following command to create a VolumeSnapshotClass using the created VolumeSnapshotClass configuration file.

   kubectl create -f mysnapclass.yaml
   

2. Run the following command to view the information about the created VolumeSnapshotClass.

   kubectl get volumesnapshotclass
   

   The following is an example of the command output.

   NAME          DRIVER           DELETIONPOLICY   AGE
   mysnapclass   csi.huawei.com   Delete           25s
   

Creating a Snapshot for a Volume

VolumeSnapshot can be provisioned in two ways: pre-provisioning and dynamic provisioning . Currently, Huawei CSI supports only dynamic provisioning. This section describes how to dynamically provision a VolumeSnapshot using Huawei CSI. The following is an example of the VolumeSnapshot configuration file:

apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
  name: mysnapshot
spec:
  volumeSnapshotClassName: mysnapclass
  source:
    persistentVolumeClaimName: mypvc

You can modify the parameters according to Table 2 .

Table 2 VolumeSnapshot parameters

Procedure

1. Run the following command to create a VolumeSnapshot using the created VolumeSnapshot configuration file.

   kubectl create -f mysnapshot.yaml
   

2. Run the following command to view the information about the created VolumeSnapshot.

   kubectl get volumesnapshot
   

   The following is an example of the command output.

   NAME         READYTOUSE   SOURCEPVC   SOURCESNAPSHOTCONTENT   RESTORESIZE   SNAPSHOTCLASS   SNAPSHOTCONTENT                                    CREATIONTIME   AGE
   mysnapshot   true         mypvc                               100Gi         mysnapclass     snapcontent-1009af0a-24c2-4435-861c-516224503f2d   <invalid>      78s