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How to clone an image from a PV to a file system 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 file system PV.

Prerequisites

  • You have a Kubernetes cluster up and running with CDI installed, source DV/PVC, and at least one available PersistentVolume to store the cloned disk image.
  • The target PV is equal or larger in size than the source DV/PVC.
  • When cloning from block to file system, content type must be kubevirt in both source and target, and host-assisted clone is used.
  • When cloning across namespaces, the user must have the ability to create pods or have 'datavolumes/source' permission in the source namespace. You can give a user the appropriate permissions to a namespace by specifying RBAC rules.

Clone an image with DataVolume manifest

Create the following DataVolume manifest clone-datavolume.yaml:

apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: cloned-datavolume
spec:
  source:
    pvc:
      namespace: source-ns
      name: source-datavolume
  storage: {}

Deploy the DataVolume manifest:

kubectl create -f clone-datavolume.yaml

By default, CDI will attempt the most efficient clone strategy possible. See Smart Cloning

For host-assisted cloning, two cloning pods, source and target, will be spawned and the image existed on the source DV/PVC, will be copied to the target DV.