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[OpenStack Infra <1799495@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/615084
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a925c8b06de9205eb69ff1272d8a64f06dfe7eda
Submitter: Zuul
Branch:    master

commit a925c8b06de9205eb69ff1272d8a64f06dfe7eda
Author: Takashi NATSUME <natsume.takashi@xxxxxxxxxxxxx>
Date:   Fri Nov 2 13:35:28 2018 +0900

    api-ref: Add descriptions for vol-backed snapshots
    
    Add descriptions about the createImage action
    in the volume-backed servers case.
    
    Change-Id: Iee81ee4ed6d6bbfa2c17955396d4ff7f36f08017
    Closes-Bug: #1799495


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1799495

Title:
  api-ref: createImage description does not mention volume-backed
  snapshots

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  The API reference for the createImage server action:

  https://developer.openstack.org/api-ref/compute/?expanded=create-
  server-back-up-createbackup-action-detail,create-image-createimage-
  action-detail#create-image-createimage-action

  Does not mention anything about volume-backed instance snapshots.
  There are a few differences:

  1. For preconditions, volume-backed server snapshot is only supported
  for ACTIVE, SHUTOFF and SUSPENDED instances, not PAUSED like for
  image-backed.

  2. The project must have sufficient volume snapshot quota in the block
  storage service.

  3. Volume snapshots will be created for all volumes attached to the
  server and then those will be represented with a
  "block_device_mapping" image property in the resulting snapshot image
  in the image service (glance). If that snapshot image is used later to
  create a new instance, it will result in a volume-backed instance
  where the root volume is created from the snapshot of the original
  root volume.

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