mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-27 00:30:18 +00:00
220 lines
7.6 KiB
Markdown
220 lines
7.6 KiB
Markdown
# Create snapshot and Clone Volume
|
|
|
|
- [Prerequisite](#prerequisite)
|
|
- [Create CephFS Snapshot and Clone Volume](#create-cephfs-snapshot-and-clone-volume)
|
|
- [Create CephFS SnapshotClass](#create-cephfs-snapshotclass)
|
|
- [Create CephFS Snapshot](#create-cephfs-snapshot)
|
|
- [Restore CephFS Snapshot to a new PVC](#restore-cephfs-snapshot-to-a-new-pvc)
|
|
- [Clone CephFS PVC](#clone-cephfs-pvc)
|
|
- [Create RBD Snapshot and Clone Volume](#create-rbd-snapshot-and-clone-volume)
|
|
- [Create RBD SnapshotClass](#create-rbd-snapshotclass)
|
|
- [Create RBD Snapshot](#create-rbd-snapshot)
|
|
- [Restore RBD Snapshot to a new PVC](#restore-rbd-snapshot-to-a-new-pvc)
|
|
- [Clone RBD PVC](#clone-rbd-pvc)
|
|
|
|
## 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](https://github.com/kubernetes-csi/external-snapshotter/)
|
|
for more information on these sidecar controllers. There should
|
|
be a `volumesnapshotclass` object present in the cluster
|
|
for snapshot request to be satisfied.
|
|
|
|
- To install snapshot controller and CRD
|
|
|
|
```console
|
|
./scripts/install-snapshot.sh install
|
|
```
|
|
|
|
To install from specific external-snapshotter version, you can leverage
|
|
`SNAPSHOT_VERSION` variable, for example:
|
|
|
|
```console
|
|
SNAPSHOT_VERSION="v4.0.0" ./scripts/install-snapshot.sh install
|
|
```
|
|
|
|
- In the future, you can choose to cleanup by running
|
|
|
|
```console
|
|
./scripts/install-snapshot.sh cleanup
|
|
```
|
|
|
|
**NOTE: At present, there is a limit of 400 snapshots per cephFS filesystem.
|
|
Also PVC cannot be deleted if it's having snapshots. Make sure all the snapshots
|
|
on the PVC are deleted before you delete the PVC.**
|
|
|
|
## Create CephFS Snapshot and Clone Volume
|
|
|
|
### Create SnapshotClass
|
|
|
|
```console
|
|
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.
|
|
It is recommended to create a volume snapshot or a PVC clone
|
|
only when the PVC is not in use.
|
|
Please refer pvc creation [doc](https://github.com/ceph/ceph-csi/blob/devel/docs/deploy-cephfs.md)
|
|
for more information on how to create a PVC.
|
|
|
|
- Verify if PVC is in Bound state
|
|
|
|
```console
|
|
$ 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
|
|
```
|
|
|
|
- Create snapshot of the bound PVC
|
|
|
|
```console
|
|
$ kubectl create -f ../examples/cephfs/snapshot.yaml
|
|
volumesnapshot.snapshot.storage.k8s.io/cephfs-pvc-snapshot created
|
|
```
|
|
|
|
- Get details about the snapshot
|
|
|
|
```console
|
|
$ 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
|
|
|
|
```console
|
|
$ 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
|
|
|
|
```console
|
|
kubectl create -f ../examples/cephfs/pvc-restore.yaml
|
|
```
|
|
|
|
```console
|
|
$ 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
|
|
|
|
```console
|
|
kubectl create -f ../examples/cephfs/pvc-clone.yaml
|
|
```
|
|
|
|
```console
|
|
$ 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
|
|
```
|
|
|
|
## Create RBD Snapshot and Clone Volume
|
|
|
|
In the `examples/rbd` directory you will find two files related to snapshots:
|
|
[snapshotclass.yaml](../examples/rbd/snapshotclass.yaml)
|
|
and [snapshot.yaml](../examples/rbd/snapshot.yaml)
|
|
|
|
Once you created RBD PVC, you'll need to customize `snapshotclass.yaml` and
|
|
make sure the `clusterid` parameter matches `clusterid` mentioned in the
|
|
storageclass from which the PVC got created.
|
|
If you followed the documentation to create the rbdplugin, you shouldn't
|
|
have to edit any other file.
|
|
|
|
After configuring everything you needed, deploy the snapshotclass:
|
|
|
|
### Create RBD-SnapshotClass
|
|
|
|
```bash
|
|
kubectl create -f snapshotclass.yaml
|
|
```
|
|
|
|
### Verify that the SnapshotClass was created
|
|
|
|
```console
|
|
$ kubectl get volumesnapshotclass
|
|
NAME AGE
|
|
csi-rbdplugin-snapclass 4s
|
|
```
|
|
|
|
### Create rbd-Snapshot
|
|
|
|
```bash
|
|
kubectl create -f snapshot.yaml
|
|
```
|
|
|
|
### Verify if your Volume Snapshot has successfully been created
|
|
|
|
```console
|
|
$ kubectl get volumesnapshot
|
|
NAME AGE
|
|
rbd-pvc-snapshot 6s
|
|
```
|
|
|
|
### Check the status of the Snapshot
|
|
|
|
```console
|
|
$ kubectl describe volumesnapshot rbd-pvc-snapshot
|
|
|
|
Name: rbd-pvc-snapshot
|
|
Namespace: default
|
|
Labels: <none>
|
|
Annotations: <none>
|
|
API Version: snapshot.storage.k8s.io/v1alpha1
|
|
Kind: VolumeSnapshot
|
|
Metadata:
|
|
Creation Timestamp: 2019-02-06T08:52:34Z
|
|
Finalizers:
|
|
snapshot.storage.kubernetes.io/volumesnapshot-protection
|
|
Generation: 5
|
|
Resource Version: 84239
|
|
Self Link: /apis/snapshot.storage.k8s.io/v1alpha1/namespaces/default/volumesnapshots/rbd-pvc-snapshot
|
|
UID: 8b9b5740-29ec-11e9-8e0f-b8ca3aad030b
|
|
Spec:
|
|
Snapshot Class Name: csi-rbdplugin-snapclass
|
|
Snapshot Content Name: snapcontent-8b9b5740-29ec-11e9-8e0f-b8ca3aad030b
|
|
Source:
|
|
API Group: <nil>
|
|
Kind: PersistentVolumeClaim
|
|
Name: rbd-pvc
|
|
Status:
|
|
Creation Time: 2019-02-06T08:52:34Z
|
|
Ready To Use: true
|
|
Restore Size: 1Gi
|
|
Events: <none>
|
|
```
|
|
|
|
### Restore the Snapshot
|
|
|
|
To restore the snapshot to a new PVC, create
|
|
[pvc-restore.yaml](../examples/rbd/pvc-restore.yaml)
|
|
and a testing pod [pod-restore.yaml](../examples/rbd/pod-restore.yaml)
|
|
|
|
```bash
|
|
kubectl create -f pvc-restore.yaml
|
|
kubectl create -f pod-restore.yaml
|
|
```
|
|
|
|
### Clone the PVC
|
|
|
|
```console
|
|
$ kubectl create -f ../examples/rbd/pvc-clone.yaml
|
|
$ kubectl get pvc
|
|
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
|
|
rbd-pvc Bound pvc-c2ffdc98-3abe-4b07-838c-35a2a8067771 1Gi RWO rook-ceph-block 41m
|
|
rbd-pvc-clone Bound pvc-b575bc35-d521-4c41-b4f9-1d733cd28fdf 1Gi RWO rook-ceph-block 45m
|
|
rbd-pvc-restore Bound pvc-95308c75-6c93-4928-a551-6b5137192209 1Gi RWO rook-ceph-block 45m
|
|
```
|