Create volume snapshots

Volume snapshots let you create a copy of your volume at a specific point in time. Use this copy to bring a volume back to a prior state or to provision a new volume. In Kubernetes, snapshots are provided through the VolumeSnapshot object.

Before you begin

To run commands against a user cluster, ensure you have the following resources:

1. Locate the user cluster name, or ask your Platform Administrator what the cluster name is.

2. Sign in and generate the kubeconfig file for the user cluster if you don't have one.

3. Use the kubeconfig path of the user cluster to replace USER_CLUSTER_KUBECONFIG in these instructions.

To get the required permissions to manage volume snapshots, ask your Organization IAM Admin to grant you the Namespace Admin role (namespace-admin) in your project namespace.

Take a volume snapshot

To take a snapshot of a PersistentVolumeClaim object, create a VolumeSnapshot object. The system does not guarantee data consistency. Pause the application and flush data before taking a snapshot.

1. Create a VolumeSnapshot custom resource:

   kubectl --kubeconfig KUBERNETES_CLUSTER_KUBECONFIG \
       --namespace NAMESPACE apply -f - <<EOF
   apiVersion: snapshot.storage.k8s.io/v1
   kind: VolumeSnapshot
   metadata:
     name: VOLUME_SNAPSHOT_NAME
   spec:
     source:
       persistentVolumeClaimName: PVC_NAME
   EOF
   

   Replace the following:

   • KUBERNETES_CLUSTER_KUBECONFIG: the kubeconfig file for the cluster.

   • NAMESPACE: the project namespace in which to create the volume snapshot.

   • VOLUME_SNAPSHOT_NAME: the VolumeSnapshot object name.

   • PVC_NAME: the name of the PVC for which you are creating a snapshot.

2. The snapshot operation is complete when the .status.readyToUse field becomes true. You can use the following command to check the status:

     kubectl --kubeconfig KUBERNETES_CLUSTER_KUBECONFIG get volumesnapshot \
       -o custom-columns='NAME:.metadata.name,READY:.status.readyToUse'
   

3. Update the PVC manifest with the volume snapshot specified as a data source:

   kubectl --kubeconfig KUBERNETES_CLUSTER_KUBECONFIG \
       --namespace NAMESPACE apply -f - <<EOF
   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: PVC_NAME
   spec:
     dataSource:
       name: VOLUME_SNAPSHOT_NAME
       kind: VolumeSnapshot
       apiGroup: snapshot.storage.k8s.io
     storageClassName: standard-rwo
     accessModes:
       - ReadWriteOnce
    resources:
      requests:
      storage: 10Gi
   EOF
   

   Replace the following:

   • KUBERNETES_CLUSTER_KUBECONFIG: the kubeconfig file for the cluster.

   • NAMESPACE: the namespace in which the PVC resource exists.

   • PVC_NAME: the name of the PVC for which you are creating a snapshot.

   • VOLUME_SNAPSHOT_NAME: the VolumeSnapshot object name you're configuring a volume snapshot.