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[OpenStack Infra <1626230@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/375623

** Changed in: nova
       Status: Opinion => In Progress

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https://bugs.launchpad.net/bugs/1626230

Title:
  instance artefacts are not removed by libvirt driver if it fails to
  spawn

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  When an instance is evacuated an attempt to rebuild it on a different
  host is made.  If the instance spawn method in the driver fails and
  raises and exception then the instance is placed in an error state.
  However the instance is still recorded a being on the source node but
  depending on how far through the spawn instance related files will be
  present and the instance may be running on the target.

  The xenAPI driver cleans up the instance artefact's if spawn fails but not
  so the libvirt driver.

  In the case where compute nodes do not use shared storage a subsequent
  attempt to evacuate the instance to the same target will fail because
  the instance directory is already present.

  The use of reset-state and then evacuate to another node will enable
  the successful evacuation of the instance.  However the 'orphaned'
  files and running instance on the original target will need to be
  cleaned up manually.

  We could update the instance's host once the claim is complete on the
  target.  In this case in the event of a failure to spawn it will
  effectively have evacuated so the files on the original host will be
  cleaned up when that node is restored.

  However maybe we should address this by bring the libvirt driver into line
  with the XenAPI driver and getting it to clean up resources associated with
  an instance that fails to spawn?  Will raise a blueprint for this.

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