How to clone an image from a PV to a block PV¶

The purpose of this document is to show how to clone an image from an existing (file system or block) DV/PVC, to a target block PV.

Prerequisites¶

You have a Kubernetes cluster up and running with CDI installed, source DV/PVC, and at least one available block PersistentVolume to store the cloned disk image.
When cloning from file system to block, content type must be kubevirt (default) in both source and target, and host-assisted clone is used.
Feature-Gate 'BlockVolume' is enabled.

Clone an image with DataVolume manifest¶

Create the following DataVolume manifest (clone-block-datavolume.yaml):

apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: clone-block-datavolume
spec:
  source:
    pvc:
      namespace: "source-ns"
      name: "source-datavolume"
  pvc:
    volumeMode: Block
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi

Deploy the DataVolume manifest:

kubectl create -f clone-block-pv-datavolume.yaml

Two cloning pods, source and target, will be spawned and the image existed on the source block PV, will be copied to the target block PV.