Creating a Snapshot and Backup

Prerequisites

• You have created a cluster.
• If you want to create a cluster by running commands, kubectl has been used to connect to the cluster. For details, see Connecting to a Cluster Using kubectl.

Constraints

• Not all regions support EVS volumes. View the regions where EVS volumes are supported on the console. You can also view Function Overview to learn about all regions where EVS volumes are supported.
• The cluster version must be v1.27.8-r0, v1.28.6-r0, or later. If the cluster version does not meet the requirements, you need to upgrade the cluster.
• The subtype (such as common I/O, high I/O, or ultra-high I/O), disk mode (SCSI or VBD), data encryption, sharing status, and capacity of an EVS disk created from a snapshot must be the same as those of the disk associated with the snapshot. These attributes cannot be modified after being checked or configured.
• Snapshots can be created only for EVS disks that are available or in use, and a maximum of seven snapshots can be created for a single EVS disk.
• The snapshots of encrypted disks are stored encrypted, and those of non-encrypted disks are stored non-encrypted.

Scenario

Snapshots can help meet your following needs:

• Routine data backup

  You can create snapshots for EVS disks regularly and use snapshots to recover your data in case that data loss or data inconsistency occurred due to misoperations, viruses, or attacks.

• Rapid data restoration

  You can create a snapshot or multiple snapshots before an OS change, application software upgrade, or a service data migration. If an exception occurs during the upgrade or migration, service data can be rapidly restored to the time point when the snapshot was created.

  For example, a fault occurred on system disk A of ECS A, and therefore ECS A cannot be started. Because system disk A is already faulty, the data on system disk A cannot be restored by rolling back snapshots. In this case, you can use an existing snapshot of system disk A to create EVS disk B and attach it to ECS B that is running properly. Then, ECS B can read data from system disk A using EVS disk B.

  

  The snapshots provided by CCE Autopilot are the same as the CSI snapshots provided by the Kubernetes community. They can only be used to create EVS disks, but cannot be used to roll back to source EVS disks.

• Rapid deployment of multiple services

  You can use a snapshot to create multiple EVS disks containing the same initial data, and these disks can be used as data resources for various services, for example, data mining, report query, and development and testing. This method protects the initial data and creates disks rapidly, meeting the diversified service data requirements.

Creating a Snapshot

Using the CCE Console

1. Log in to the CCE console.
2. Click the cluster name to go to the cluster console. In the navigation pane, choose Storage. Then click the Snapshots and Backups tab.
3. In the upper right corner, click Create Snapshot. In the displayed dialog box, configure the parameters.
   Figure 1 Creating a snapshot
   

   Table 1 Parameters for creating a snapshot

   Parameter	Description
   Snapshot Name	Enter the snapshot name, for example, disksnap-test1.
   Storage	Select the PVC for which you want to create a snapshot. Only EVS PVCs can be selected. In this example, select pvc.

4. Click Create. On the Snapshots and Backups tab, view details about the snapshot.
   Figure 2 Snapshot details
   

Creating from YAML

kind: VolumeSnapshot
apiVersion: snapshot.storage.k8s.io/v1beta1
metadata:
  name: disksnap-test1 # Snapshot name
  namespace: default
spec:
  source:
    persistentVolumeClaimName: pvc     # PVC name. Only an EVS PVC can be selected.
  volumeSnapshotClassName: csi-disk-snapclass

Using a Snapshot to Create a PVC

The disk type, encryption setting, and disk mode of the created EVS PVC are consistent with those of the snapshot's source EVS disk.

Using the CCE Console

1. Log in to the CCE console.
2. Click the cluster name to go to the cluster console. In the navigation pane, choose Storage. Then click the Snapshots and Backups tab.
3. Locate the snapshot that you want to use for creating a PVC, click Create PVC, and configure PVC parameters in the displayed dialog box.
   Figure 3 Using a snapshot to create a PVC
   

   Table 2 Parameters for creating a PVC using a snapshot

   Parameter	Description
   PVC Name	Enter a PVC name, for example, pvc-disksnap.
   (Optional) PV Name Prefix	This parameter specifies the name of the underlying storage that is automatically created. The actual underlying storage name is in the format of "PV name prefix + PVC UID". If this parameter is left blank, the default prefix pvc will be used. For example, if the storage volume name prefix is set to test, the actual underlying storage name is test-{UID}.
   Resource Tag	You can add resource tags to classify resources. You can create predefined tags on the TMS console. The predefined tags are available to all resources that support tags. You can use predefined tags to improve the tag creation and resource migration efficiency. For details, see Creating Predefined Tags. CCE automatically creates system tags CCE-Cluster-ID={Cluster ID}, CCE-Cluster-Name={Cluster name}, and CCE-Namespace={Namespace name}. These tags cannot be modified.

4. Click Create. Click the PVCs tab to view the created PVC.

Creating from YAML

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-disksnap # PVC name
  namespace: default
  annotations:
    everest.io/disk-volume-type: SSD     # EVS disk type, which must be the same as that of the snapshot's source EVS disk.
    everest.io/disk-iops: '3000'      # (Optional) IOPS of only a GPSSD2 EVS disk 
    everest.io/disk-throughput: '125' # (Optional) Throughput of only a GPSSD2 EVS disk 
  labels:
    failure-domain.beta.kubernetes.io/region: <your_region>   # Replace the region with the one where the EVS disk is located.
    failure-domain.beta.kubernetes.io/zone: <your_zone>       # Replace the AZ with the one where the EVS disk is located.
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: csi-disk
  dataSource:
    name: disksnap-test1             # Snapshot name
    kind: VolumeSnapshot
    apiGroup: snapshot.storage.k8s.io