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We can create a snapshot of a volume that can be used further for creating a clone and for taking a backup. To create a snapshot, we have to first create a SnapshotClass just like a storage class where you can provide deletionPolicy as Retain or Delete.

$ cat snapshotclass.yaml
kind: VolumeSnapshotClass
apiVersion: snapshot.storage.k8s.io/v1
metadata:
name: zfspv-snapclass
annotations:
snapshot.storage.kubernetes.io/is-default-class: "true"
driver: zfs.csi.openebs.io
deletionPolicy: Delete

Apply the snapshotclass YAML:

$ kubectl apply -f snapshotclass.yaml
volumesnapshotclass.snapshot.storage.k8s.io/zfspv-snapclass created

Find a PVC for which snapshot has to be created.

$ kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
csi-zfspv Bound pvc-73402f6e-d054-4ec2-95a4-eb8452724afb 4Gi RWO openebs-zfspv 2m35s

Create the snapshot using the created SnapshotClass for the selected PVC.

$ cat snapshot.yaml
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
name: zfspv-snap
spec:
volumeSnapshotClassName: zfspv-snapclass
source:
persistentVolumeClaimName: csi-zfspv

Apply the snapshot.yaml.

$ kubectl apply -f snapshot.yaml
volumesnapshot.snapshot.storage.k8s.io/zfspv-snap created
note

Create the snapshot in the same namespace where the PVC is created. Check the created snapshot resource, make sure readyToUsefield is true, before using this snapshot for any purpose.

$ kubectl get volumesnapshot.snapshot
NAME AGE
zfspv-snap 2m8s
$ kubectl get volumesnapshot.snapshot zfspv-snap -o yaml
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"snapshot.storage.k8s.io/v1","kind":
"VolumeSnapshot","metadata":{"annotations":{},"name":
"zfspv-snap","namespace":"default"},"spec":{"source":{"persistentVolumeClaimName":"csi-zfspv"},"volumeSnapshotClassName":"zfspv-snapclass"}}
creationTimestamp: "2020-02-25T08:25:51Z"
finalizers:
- snapshot.storage.kubernetes.io/volumesnapshot-as-source-protection
- snapshot.storage.kubernetes.io/volumesnapshot-bound-protection
generation: 1
name: zfspv-snap
namespace: default
resourceVersion: "447494"
selfLink: /apis/snapshot.storage.k8s.io/v1/namespaces/default/volumesnapshots/zfspv-snap
uid: 3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd
spec:
source:
persistentVolumeClaimName: csi-zfspv
volumeSnapshotClassName: zfspv-snapclass
status:
boundVolumeSnapshotContentName: snapcontent-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd
creationTime: "2020-02-25T08:25:51Z"
readyToUse: true
restoreSize: "0"

Check the OpenEBS resource for the created snapshot. The status should be "Ready".

$ kubectl get zfssnap -n openebs
NAME AGE
snapshot-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd 3m32s
$ kubectl get zfssnap snapshot-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd -n openebs -oyaml
apiVersion: openebs.io/v1alpha1
kind: ZFSSnapshot
metadata:
creationTimestamp: "2020-02-25T08:25:51Z"
finalizers:
- zfs.openebs.io/finalizer
generation: 2
labels:
kubernetes.io/nodename: e2e1-node2
openebs.io/persistent-volume: pvc-73402f6e-d054-4ec2-95a4-eb8452724afb
name: snapshot-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd
namespace: openebs
resourceVersion: "447328"
selfLink: /apis/openebs.io/v1alpha1/namespaces/openebs/zfssnapshots/snapshot-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd
uid: 6142492c-3785-498f-aa4a-569ec6c0e2b8
spec:
capacity: "4294967296"
fsType: zfs
ownerNodeID: e2e1-node2
poolName: test-pool
volumeType: DATASET
status:
state: Ready

We can go to the node and confirm that snapshot has been created:

# zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
test-pool 818K 9.63G 24K /test-pool
test-pool/pvc-73402f6e-d054-4ec2-95a4-eb8452724afb 24K 4.00G 24K /var/lib/kubelet/pods/3862895a-8a67-446e-80f7-f3c18881e391/volumes/kubernetes.io~csi/pvc-73402f6e-d054-4ec2-95a4-eb8452724afb/mount
test-pool/pvc-73402f6e-d054-4ec2-95a4-eb8452724afb@snapshot-3cbd5e59-4c6f-4bd6-95ba-7f72c9f12fcd 0B - 24K -

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