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Namespace Transfer

Summary

The Object Transfer API allows for logically moving PersistentVolumeClaims and DataVolumes between namespaces. It does this by mainpulating Kubernetes API resources and does not move any physical data on the volume. This API is used internally by the CDI controller to facilitate efficient cross namespace cloning for DataVolumes. It is also possible for cluster admins to use the Object Transfer API directly. Given the following manifest:

apiVersion: cdi.kubevirt.io/v1beta1
kind: ObjectTransfer
metadata:
  name: t1
spec:
  source:
    kind: PersistentVolumeClaim
    namespace: source
    name: source-pvc
  target:
    namespace: destintation
    name: destination-pvc

The PersistentVolumeClaim source-pvc in the namespace source will be moved to the namespace destination with the given name destination-pvc.

Note that this is a cluster scoped resource. A namespace scoped API is forthcoming.

Transfer Operations

The following operations occur when the the ObjectTransfer above is executed:

  1. The PersistentVolume source-pvc is bound to (source-pv) is set to Retain if not already
  2. source-pvc is deleted
  3. source-pv claimRef is set to destination\destination-pvc
  4. destination-pvc is created with the same spec as source-pvc before it was deleted