yahoo-eng-team team mailing list archive

[sean mooney <1959186@xxxxxxxxxxxxxxxxxx>]

based on our irc meeting we determin we do not have enough info to fully triage this form our side since we don't know the image
types that are in use when you careted the VM and snapshots vs uploaded an image directly.


i suspect the issue is that the snapstho is a shallow image create by a direct snapshot in ceph and 
we are doing a shallow copy of that when we boot the new image.

that is what we would expect and is a performance optimization that may operator depend on.
so this does not appear to be a bug form a nova perspective but is perhaps a feature request.

like the ability to flaten on snapshot or simialr.

** Also affects: glance
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1959186

Title:
  [rbd] VM created from snapshot becomes a child of that RBD image

Status in Glance:
  New
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  When I create an instance from a snapshot, the underlying RBD image of the new instance is actually a child of the snapshot in RBD.
  Then I can't delete that snapshot because in Ceph it has children and is protected, thus Glance will throw this error: "Image <ID> could not be deleted because it is in use: The image cannot be deleted because it is in use through the backend store outside of Glance."

  Steps to reproduce:
  1. Create a server
      $ openstack server create server-1

  2. Create a snapshot from that server
      $ openstack server image create $SERVER_1_ID

  3. Create a new server from the snapshot
      $ openstack server create --image $SNAPSHOT_ID server-2

  4. Try to delete the snapshot, it will throw the above error from Glance (it is in use through the backend store outside of Glance.)
      $ openstack image delete $SNAPSHOT_ID

  5. Check the snapshot image in RBD, it will have the new instance's disk as children.
      $ rbd children images/$SNAPSHOT_ID
      > vms/<server-2>_disk

  This doesn't happen when creating instances from images uploaded
  through glance, but only when using images created with `openstack
  server image create`

  Environment
  - Openstack Xena (Nova 17.6.0)
  - Libvirt with KVM virt_type
  - RBD for ephemeral storage
  - Ceph pacific

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