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ceph-csi/docs/cephfs-snap-clone.md
Humble Chirammal 3c6149b86e cephfs: Add documentation about snapshot create/restore and clone 
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
2020-08-13 07:16:31 +00:00

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Create CephFS snapshot and Clone Volume

Prerequisite

  • For snapshot functionality to be supported for your Kubernetes cluster, the Kubernetes version running in your cluster should be >= v1.17. We also need the snapshot controller deployed in your Kubernetes cluster along with csi-snapshotter sidecar container. Refer external-snapshotter for more information on these sidecar controllers. There should be a volumesnapshotclass object present in the cluster for snapshot request to be satisified.

Snapshot

Create snapshotclass

kubectl create -f ../examples/cephfs/snapshotclass.yaml

Create snapshot

The snapshot is created on/for an existing PVC. You should have a PVC in bound state before creating snapshot from it. please refer pvc creation doc for more information on how to create a PVC.

$ kubectl create -f ../examples/cephfs/snapshot.yaml
volumesnapshot.snapshot.storage.k8s.io/cephfs-pvc-snapshot created
  • Get details about the snapshot
$ kubectl get volumesnapshot
NAME                  READYTOUSE   SOURCEPVC       SOURCESNAPSHOTCONTENT   RESTORESIZE   SNAPSHOTCLASS                SNAPSHOTCONTENT                                    CREATIONTIME   AGE
cephfs-pvc-snapshot   true         csi-cephfs-pvc                          1Gi           csi-cephfsplugin-snapclass   snapcontent-34476204-a14a-4d59-bfbc-2bbba695652c   3s             6s
  • Get details about the volumesnapshotcontent
$ kubectl get volumesnapshotcontent
NAME                                               READYTOUSE   RESTORESIZE   DELETIONPOLICY   DRIVER                VOLUMESNAPSHOTCLASS          VOLUMESNAPSHOT        AGE
snapcontent-34476204-a14a-4d59-bfbc-2bbba695652c   true         1073741824    Delete           cephfs.csi.ceph.com   csi-cephfsplugin-snapclass   cephfs-pvc-snapshot   64s

Restore snapshot to a new PVC


$ kubectl create -f ../examples/cephfs/pvc-restore.yaml
$ kubectl get pvc
NAME                 STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
csi-cephfs-pvc       Bound    pvc-1ea51547-a88b-4ab0-8b4a-812caeaf025d   1Gi        RWX            csi-cephfs-sc  20h
cephfs-pvc-restore   Bound    pvc-95308c75-6c93-4928-a551-6b5137192209   1Gi        RWX            csi-cephfs-sc  11m

Clone PVC

$ kubectl create -f ../examples/cephfs/pvc-clone.yaml
$ kubectl get pvc
NAME                 STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
csi-cephfs-pvc       Bound    pvc-1ea51547-a88b-4ab0-8b4a-812caeaf025d   1Gi        RWX            csi-cephfs-sc  20h
cephfs-pvc-clone     Bound    pvc-b575bc35-d521-4c41-b4f9-1d733cd28fdf   1Gi        RWX            csi-cephfs-sc  39s
cephfs-pvc-restore   Bound    pvc-95308c75-6c93-4928-a551-6b5137192209   1Gi        RWX            csi-cephfs-sc  55m