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[Edward Hope-Morley <edward.hope-morley@xxxxxxxxxxxxx>]

** Changed in: cloud-archive
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1535918

Title:
  instance.host not updated on evacuation

Status in Ubuntu Cloud Archive:
  Fix Released
Status in OpenStack Compute (nova):
  Fix Released
Status in nova-powervm:
  Fix Released
Status in nova package in Ubuntu:
  New

Bug description:
  [Impact]

  Affected to Xenial Mitaka, UCA Mitaka

  just after creating vm and state ACTIVE,

  When evacuating it, it is failed with ERROR state.

  [Test case]

  In below env,
  http://pastebin.ubuntu.com/25337153/

  Network configuration is important in this case, because I tested
  different configuration. but couldn't reproduce it.

  reproduction test script ( based on juju )

  http://pastebin.ubuntu.com/25360805/

  [Regression Potential]

  this is about evacuation, Could be issue on evacuation.
  especially recreating vm

  [Others]

  In test, I should patch two commits, one from

  https://bugs.launchpad.net/nova/+bug/1686041

  Related Patches.
  https://github.com/openstack/nova/commit/a5b920a197c70d2ae08a1e1335d979857f923b4f
  https://github.com/openstack/nova/commit/a2b0824aca5cb4a2ae579f625327c51ed0414d35

  [Original description]

  I'm working on the nova-powervm driver for Mitaka and trying to add
  support for evacuation.

  The problem I'm hitting is that instance.host is not updated when the
  compute driver is called to spawn the instance on the destination
  host.  It is still set to the source host.  It's not until after the
  spawn completes that the compute manager updates instance.host to
  reflect the destination host.

  The nova-powervm driver uses instance events callback mechanism during
  plug VIF to determine when Neutron has finished provisioning the
  network.  The instance events code sends the event to instance.host
  and hence is sending the event to the source host (which is down).
  This causes the spawn to fail and also causes weirdness when the
  source host gets the events when it's powered back up.

  To temporarily work around the problem, I hacked in setting
  instance.host = CONF.host; instance.save() in the compute driver but
  that's not a good solution.

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