Volume Snapshot Classes
This document describes the concept of VolumeSnapshotClass in Kubernetes. Familiarity with volume snapshots and storage classes is suggested.
Just like StorageClass provides a way for administrators to describe the "classes" of storage they offer when provisioning a volume, VolumeSnapshotClass provides a way to describe the "classes" of storage when provisioning a volume snapshot.
The VolumeSnapshotClass Resource
Each VolumeSnapshotClass contains the fields
which are used when a VolumeSnapshot belonging to the class needs to be
The name of a VolumeSnapshotClass object is significant, and is how users can request a particular class. Administrators set the name and other parameters of a class when first creating VolumeSnapshotClass objects, and the objects cannot be updated once they are created.
apiVersion: snapshot.storage.k8s.io/v1 kind: VolumeSnapshotClass metadata: name: csi-hostpath-snapclass driver: hostpath.csi.k8s.io deletionPolicy: Delete parameters:
Administrators can specify a default VolumeSnapshotClass for VolumeSnapshots
that don't request any particular class to bind to by adding the
snapshot.storage.kubernetes.io/is-default-class: "true" annotation:
apiVersion: snapshot.storage.k8s.io/v1 kind: VolumeSnapshotClass metadata: name: csi-hostpath-snapclass annotations: snapshot.storage.kubernetes.io/is-default-class: "true" driver: hostpath.csi.k8s.io deletionPolicy: Delete parameters:
Volume snapshot classes have a driver that determines what CSI volume plugin is used for provisioning VolumeSnapshots. This field must be specified.
Volume snapshot classes have a deletionPolicy. It enables you to configure what happens to a VolumeSnapshotContent when the VolumeSnapshot object it is bound to is to be deleted. The deletionPolicy of a volume snapshot class can either be
Delete. This field must be specified.
If the deletionPolicy is
Delete, then the underlying storage snapshot will be deleted along with the VolumeSnapshotContent object. If the deletionPolicy is
Retain, then both the underlying snapshot and VolumeSnapshotContent remain.
Volume snapshot classes have parameters that describe volume snapshots belonging to
the volume snapshot class. Different parameters may be accepted depending on the