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[Dong Ma <2122466@xxxxxxxxxxxxxxxxxx>]

Verified this is only happen from horizon, so should be the bug in
horizon.

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

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https://bugs.launchpad.net/bugs/2122466

Title:
  Live migration ignores image traits for volume-backed instances

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  When creating a volume-backed instance from an image (e.g. --boot-
  from-volume), Nova correctly considers the image metadata (including
  traits such as trait:CUSTOM_LICENSE_WINDOWS_SERVER=required) during
  scheduling.

  However, when performing a live migration of such an instance, the
  image traits are not enforced. As a result, the instance can migrate
  to a host that does not satisfy the original image requirements (e.g.
  licensing traits for Windows).

  This leads to a violation of licensing requirements and inconsistent
  behavior between initial scheduling and live migration.

  
  Steps to reproduce:

  1. Create a flavor without traits.

  2. Upload a Windows image with property
  trait:CUSTOM_LICENSE_WINDOWS_SERVER=required.

  3. Boot a server from volume using that image.

  4. Verify that the instance is scheduled only to hosts with the
  required trait.

  5. Attempt a live migration to a host without the
  CUSTOM_LICENSE_WINDOWS_SERVER trait.

  6. Observe that migration succeeds, even though the destination host
  does not have the required trait.

  Expected result:
  Live migration should respect the same scheduling constraints as initial boot. Specifically, traits derived from the image metadata (and stored in the root volume’s volume_image_metadata) should be enforced.

  Actual result:
  Live migration ignores the image traits for volume-backed instances because instance.image_ref is None, so no image metadata is passed to the scheduler/Placement.

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