Volume Snapshot Classes

    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.

    Each VolumeSnapshotClass contains the fields , deletionPolicy, and parameters, which are used when a VolumeSnapshot belonging to the class needs to be dynamically provisioned.

    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:

    1. apiVersion: snapshot.storage.k8s.io/v1
    2. kind: VolumeSnapshotClass
    4.   name: csi-hostpath-snapclass
    5.     snapshot.storage.kubernetes.io/is-default-class: "true"
    6. driver: hostpath.csi.k8s.io
    7. deletionPolicy: Delete

    Volume snapshot classes have a driver that determines what CSI volume plugin is used for provisioning VolumeSnapshots. This field must be specified.

    DeletionPolicy

    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 driver.