DigitalOcean Kubernetes (DOKS) is a managed Kubernetes service. Deploy Kubernetes clusters with a fully managed control plane, high availability, autoscaling, and native integration with DigitalOcean Load Balancers and volumes. DOKS clusters are compatible with standard Kubernetes toolchains and the DigitalOcean API and CLI.
In Kubernetes, a volume snapshot is a point-in-time copy of the contents of a Kubernetes cluster. You can use snapshots to back up a cluster’s data or copy the data to another resource without needing to create a new volume.
You must have an existing volume in use in your cluster, which you can create by creating a PersistentVolumeClaim (PVC). For the purposes of this tutorial, presume we have already created a PVC by calling kubectl create -f your_pvc_file.yaml with a YAML file that looks like this:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: csi-do-test-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
storageClassName: do-block-storage
To create a snapshot of a volume, call kubectl create -f your_snapshot_file.yaml and specify the desired PVC. Here’s an example of a YAML file that defines a snapshot:
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
name: csi-do-test-snapshot
spec:
source:
persistentVolumeClaimName: csi-do-test-pvc
If you are using a DigitalOcean Kubernetes version prior to 1.18, the snapshot resource was supported in the alpha version only and used different fields:
apiVersion: snapshot.storage.k8s.io/v1alpha1
kind: VolumeSnapshot
metadata:
name: csi-do-test-snapshot
spec:
source:
name: csi-do-test-pvc
kind: PersistentVolumeClaim
You can now observe the state of your volumes and snapshots in the DigitalOcean Control Panel or by using the following command:
kubectl get pvc && kubectl get pv && kubectl get volumesnapshot