[Bug 1896617] Re: Creation of image (or live snapshot) from the existing VM fails if libvirt-image-backend is configured to qcow2 starting from Ussuri

[Lee Yarwood]

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

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https://bugs.launchpad.net/bugs/1896617

Title:
  Creation of image (or live snapshot) from the existing VM fails if
  libvirt-image-backend is configured to qcow2 starting from Ussuri

Status in OpenStack nova-compute charm:
  Invalid
Status in OpenStack Compute (nova):
  Invalid
Status in nova package in Ubuntu:
  Triaged

Bug description:
  tl;dr

  1) creating the image from the existing VM fails if qcow2 image backend is used, but everything is fine if using rbd image backend in nova-compute.
  2) openstack server image create --name <name of the new image> <instance name or uuid> fails with some unrelated error:

  $ openstack server image create --wait 842fa12c-19ee-44cb-bb31-36d27ec9d8fc
  HTTP 404 Not Found: No image found with ID f4693860-cd8d-4088-91b9-56b2f173ffc7

  == Details ==

  Two Tempest tests ([1] and [2]) from the 2018.02 Refstack test lists
  [0] are failing with the following exception:

  49701867-bedc-4d7d-aa71-7383d877d90c
  Traceback (most recent call last):
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/api/compute/base.py", line 369, in create_image_from_server
      waiters.wait_for_image_status(client, image_id, wait_until)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/common/waiters.py", line 161, in wait_for_image_status
      image = show_image(image_id)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/lib/services/compute/images_client.py", line 74, in show_image
      resp, body = self.get("images/%s" % image_id)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/lib/common/rest_client.py", line 298, in get
      return self.request('GET', url, extra_headers, headers)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/lib/services/compute/base_compute_client.py", line 48, in request
      method, url, extra_headers, headers, body, chunked)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/lib/common/rest_client.py", line 687, in request
      self._error_checker(resp, resp_body)
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/lib/common/rest_client.py", line 793, in _error_checker
      raise exceptions.NotFound(resp_body, resp=resp)
  tempest.lib.exceptions.NotFound: Object not found
  Details: {'code': 404, 'message': 'Image not found.'}

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/api/compute/images/test_images_oneserver.py", line 69, in test_create_delete_image
      wait_until='ACTIVE')
    File "/home/ubuntu/snap/fcbtest/14/.rally/verification/verifier-2d9cbf4d-fcbb-491d-848d-5137a9bde99e/repo/tempest/api/compute/base.py", line 384, in create_image_from_server
      image_id=image_id)
  tempest.exceptions.SnapshotNotFoundException: Server snapshot image d82e95b0-9c62-492d-a08c-5bb118d3bf56 not found.

  So far I was able to identify the following:

  1) https://github.com/openstack/tempest/blob/master/tempest/api/compute/images/test_images_oneserver.py#L69 invokes a "create image from server"
  2) It fails with the following error message in the nova-compute logs: https://pastebin.canonical.com/p/h6ZXdqjRRm/

  The same occurs if the "openstack server image create --wait" will be
  executed; however, according to
  https://docs.openstack.org/nova/ussuri/admin/migrate-instance-with-
  snapshot.html the VM has to be shut down before the image creation:

  "Shut down the source VM before you take the snapshot to ensure that
  all data is flushed to disk. If necessary, list the instances to view
  the instance name. Use the openstack server stop command to shut down
  the instance:"

  This step is definitely being skipped by the test (e.g it's trying to
  perform the snapshot on top of the live VM).

  FWIW, I'm using libvirt-image-backend: qcow2 in my nova-compute
  application params; and I was able to confirm that if the above
  parameter will be changed to "libvirt-image-backend: rbd", the tests
  will pass successfully.

  Also, there is similar issue I was able to find:
  https://bugs.launchpad.net/nova/+bug/1885418 but it doesn't have any
  useful information rather then confirmation of the fact that OpenStack
  Ussuri + libvirt backend has some problem with the live snapshotting.

  [0] https://refstack.openstack.org/api/v1/guidelines/2018.02/tests?target=platform&type=required&alias=true&flag=false
  [1] tempest.api.compute.images.test_images_oneserver.ImagesOneServerTestJSON.test_create_delete_image[id-3731d080-d4c5-4872-b41a-64d0d0021314]
  [2] tempest.api.compute.images.test_images_oneserver.ImagesOneServerTestJSON.test_create_image_specify_multibyte_character_image_name[id-3b7c6fe4-dfe7-477c-9243-b06359db51e6]

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