Monday, October 18, 2021
In The News Kubernetes Volume Snapshot feature is now GA

Kubernetes Volume Snapshot feature is now GA

So what is a volume snapshot?

Many storage systems (like Google Cloud Persistent Disks, Amazon Elastic Block Storage, etc.) provide the ability to create a “snapshot” of a persistent volume. A snapshot represents a point-in-time copy of a volume.

Why add volume snapshots to Kubernetes?

By providing a standard way to trigger volume snapshot operations in Kubernetes, this feature allows Kubernetes users to incorporate snapshot operations in a portable manner on any Kubernetes environment regardless of the underlying storage.

Additionally, these Kubernetes snapshot primitives act as basic building blocks that unlock the ability to develop advanced enterprise-grade storage administration features for Kubernetes, including application or cluster level backup solutions.

What are the limitations? 

The GA implementation of volume snapshots for Kubernetes has the following limitations:

  • Does not support reverting an existing PVC to an earlier state represented by a snapshot (only supports provisioning a new volume from a snapshot).

How to learn more?

The code repository for snapshot APIs and controller is here: https://github.com/kubernetes-csi/external-snapshotter

Check out additional documentation on the snapshot feature here: http://k8s.io/docs/concepts/storage/volume-snapshots and https://kubernetes-csi.github.io/docs/

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