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220 lines
7.6 KiB
Markdown
220 lines
7.6 KiB
Markdown
# Create snapshot and Clone Volume
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- [Prerequisite](#prerequisite)
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- [Create CephFS Snapshot and Clone Volume](#create-cephfs-snapshot-and-clone-volume)
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- [Create CephFS SnapshotClass](#create-cephfs-snapshotclass)
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- [Create CephFS Snapshot](#create-cephfs-snapshot)
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- [Restore CephFS Snapshot to a new PVC](#restore-cephfs-snapshot-to-a-new-pvc)
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- [Clone CephFS PVC](#clone-cephfs-pvc)
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- [Create RBD Snapshot and Clone Volume](#create-rbd-snapshot-and-clone-volume)
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- [Create RBD SnapshotClass](#create-rbd-snapshotclass)
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- [Create RBD Snapshot](#create-rbd-snapshot)
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- [Restore RBD Snapshot to a new PVC](#restore-rbd-snapshot-to-a-new-pvc)
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- [Clone RBD PVC](#clone-rbd-pvc)
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## Prerequisite
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- For snapshot functionality to be supported for your Kubernetes cluster, the
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Kubernetes version running in your cluster should be >= v1.17. We also need the
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`snapshot controller` deployed in your Kubernetes cluster along with `csi-snapshotter`
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sidecar container.
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Refer [external-snapshotter](https://github.com/kubernetes-csi/external-snapshotter/)
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for more information on these sidecar controllers. There should
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be a `volumesnapshotclass` object present in the cluster
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for snapshot request to be satisfied.
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- To install snapshot controller and CRD
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```console
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./scripts/install-snapshot.sh install
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```
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To install from specific external-snapshotter version, you can leverage
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`SNAPSHOT_VERSION` variable, for example:
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```console
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SNAPSHOT_VERSION="v4.0.0" ./scripts/install-snapshot.sh install
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```
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- In the future, you can choose to cleanup by running
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```console
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./scripts/install-snapshot.sh cleanup
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```
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**NOTE: At present, there is a limit of 400 snapshots per cephFS filesystem.
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Also PVC cannot be deleted if it's having snapshots. Make sure all the snapshots
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on the PVC are deleted before you delete the PVC.**
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## Create CephFS Snapshot and Clone Volume
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### Create SnapshotClass
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```console
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kubectl create -f ../examples/cephfs/snapshotclass.yaml
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```
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### Create Snapshot
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The snapshot is created on/for an existing PVC. You should
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have a PVC in bound state before creating snapshot from it.
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It is recommended to create a volume snapshot or a PVC clone
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only when the PVC is not in use.
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Please refer pvc creation [doc](https://github.com/ceph/ceph-csi/blob/devel/docs/deploy-cephfs.md)
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for more information on how to create a PVC.
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- Verify if PVC is in Bound state
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```console
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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csi-cephfs-pvc Bound pvc-1ea51547-a88b-4ab0-8b4a-812caeaf025d 1Gi RWX csi-cephfs-sc 20h
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```
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- Create snapshot of the bound PVC
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```console
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$ kubectl create -f ../examples/cephfs/snapshot.yaml
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volumesnapshot.snapshot.storage.k8s.io/cephfs-pvc-snapshot created
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```
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- Get details about the snapshot
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```console
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$ kubectl get volumesnapshot
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NAME READYTOUSE SOURCEPVC SOURCESNAPSHOTCONTENT RESTORESIZE SNAPSHOTCLASS SNAPSHOTCONTENT CREATIONTIME AGE
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cephfs-pvc-snapshot true csi-cephfs-pvc 1Gi csi-cephfsplugin-snapclass snapcontent-34476204-a14a-4d59-bfbc-2bbba695652c 3s 6s
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```
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- Get details about the volumesnapshotcontent
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```console
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$ kubectl get volumesnapshotcontent
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NAME READYTOUSE RESTORESIZE DELETIONPOLICY DRIVER VOLUMESNAPSHOTCLASS VOLUMESNAPSHOT AGE
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snapcontent-34476204-a14a-4d59-bfbc-2bbba695652c true 1073741824 Delete cephfs.csi.ceph.com csi-cephfsplugin-snapclass cephfs-pvc-snapshot 64s
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```
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### Restore Snapshot to a new PVC
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```console
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kubectl create -f ../examples/cephfs/pvc-restore.yaml
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```
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```console
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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csi-cephfs-pvc Bound pvc-1ea51547-a88b-4ab0-8b4a-812caeaf025d 1Gi RWX csi-cephfs-sc 20h
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cephfs-pvc-restore Bound pvc-95308c75-6c93-4928-a551-6b5137192209 1Gi RWX csi-cephfs-sc 11m
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```
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### Clone PVC
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```console
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kubectl create -f ../examples/cephfs/pvc-clone.yaml
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```
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```console
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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csi-cephfs-pvc Bound pvc-1ea51547-a88b-4ab0-8b4a-812caeaf025d 1Gi RWX csi-cephfs-sc 20h
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cephfs-pvc-clone Bound pvc-b575bc35-d521-4c41-b4f9-1d733cd28fdf 1Gi RWX csi-cephfs-sc 39s
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cephfs-pvc-restore Bound pvc-95308c75-6c93-4928-a551-6b5137192209 1Gi RWX csi-cephfs-sc 55m
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```
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## Create RBD Snapshot and Clone Volume
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In the `examples/rbd` directory you will find two files related to snapshots:
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[snapshotclass.yaml](../examples/rbd/snapshotclass.yaml)
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and [snapshot.yaml](../examples/rbd/snapshot.yaml)
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Once you created RBD PVC, you'll need to customize `snapshotclass.yaml` and
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make sure the `clusterid` parameter matches `clusterid` mentioned in the
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storageclass from which the PVC got created.
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If you followed the documentation to create the rbdplugin, you shouldn't
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have to edit any other file.
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After configuring everything you needed, deploy the snapshotclass:
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### Create RBD-SnapshotClass
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```bash
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kubectl create -f snapshotclass.yaml
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```
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### Verify that the SnapshotClass was created
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```console
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$ kubectl get volumesnapshotclass
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NAME AGE
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csi-rbdplugin-snapclass 4s
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```
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### Create rbd-Snapshot
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```bash
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kubectl create -f snapshot.yaml
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```
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### Verify if your Volume Snapshot has successfully been created
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```console
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$ kubectl get volumesnapshot
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NAME AGE
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rbd-pvc-snapshot 6s
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```
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### Check the status of the Snapshot
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```console
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$ kubectl describe volumesnapshot rbd-pvc-snapshot
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Name: rbd-pvc-snapshot
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Namespace: default
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Labels: <none>
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Annotations: <none>
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API Version: snapshot.storage.k8s.io/v1alpha1
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Kind: VolumeSnapshot
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Metadata:
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Creation Timestamp: 2019-02-06T08:52:34Z
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Finalizers:
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snapshot.storage.kubernetes.io/volumesnapshot-protection
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Generation: 5
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Resource Version: 84239
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Self Link: /apis/snapshot.storage.k8s.io/v1alpha1/namespaces/default/volumesnapshots/rbd-pvc-snapshot
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UID: 8b9b5740-29ec-11e9-8e0f-b8ca3aad030b
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Spec:
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Snapshot Class Name: csi-rbdplugin-snapclass
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Snapshot Content Name: snapcontent-8b9b5740-29ec-11e9-8e0f-b8ca3aad030b
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Source:
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API Group: <nil>
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Kind: PersistentVolumeClaim
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Name: rbd-pvc
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Status:
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Creation Time: 2019-02-06T08:52:34Z
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Ready To Use: true
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Restore Size: 1Gi
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Events: <none>
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```
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### Restore the Snapshot
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To restore the snapshot to a new PVC, create
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[pvc-restore.yaml](../examples/rbd/pvc-restore.yaml)
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and a testing pod [pod-restore.yaml](../examples/rbd/pod-restore.yaml)
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```bash
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kubectl create -f pvc-restore.yaml
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kubectl create -f pod-restore.yaml
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```
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### Clone the PVC
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```console
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$ kubectl create -f ../examples/rbd/pvc-clone.yaml
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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rbd-pvc Bound pvc-c2ffdc98-3abe-4b07-838c-35a2a8067771 1Gi RWO rook-ceph-block 41m
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rbd-pvc-clone Bound pvc-b575bc35-d521-4c41-b4f9-1d733cd28fdf 1Gi RWO rook-ceph-block 45m
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rbd-pvc-restore Bound pvc-95308c75-6c93-4928-a551-6b5137192209 1Gi RWO rook-ceph-block 45m
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```
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