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119 lines
4.4 KiB
Markdown
119 lines
4.4 KiB
Markdown
# Create CephFS snapshot and Clone Volume
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- [Create CephFS snapshot and Clone Volume](#create-cephfs-snapshot-and-clone-volume)
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- [Prerequisite](#prerequisite)
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- [Snapshot](#snapshot)
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- [Create snapshotclass](#create-snapshotclass)
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- [Create snapshot](#create-snapshot)
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- [Restore snapshot to a new PVC](#restore-snapshot-to-a-new-pvc)
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- [Clone PVC](#clone-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="v3.0.1" ./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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## Snapshot
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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/master/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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