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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => grizzly-3

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https://bugs.launchpad.net/bugs/1081373

Title:
  Retrieving instance XML in libvirt driver is inconsistent

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  There are many libvirt operations which require the instance XML to
  function.  We use a combination of the existing defined XML, the XML
  in the instances directory or to_xml function.  There's no reason to
  ever use the the XML files stored in the instances directory; it is
  there for operational purposes only.  Unless we absolutely need the
  running XML, we should use to_xml to generate the configuration based
  on what Nova absolutely knows about the instance.  Also, we should
  make sure that if we're keeping an XML file around in the instances
  directory for operations, that it's always kept up to date.

  This will undo any one-off/by-hand changes in favor of absolute
  consistency with the database, which is preferred.  For example, if a
  running VM references a block device which Nova does not know about,
  today we'll fail to start that VM based on the fact that none of the
  logic to re-create iSCSI connections (or otherwise) are executed.

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