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[Sean Dague <sean@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1281217

Title:
  Improve error notification when schedule_run_instance fails

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  When trying to spawn a new instance on an OpenStack installation, and
  the spawn fails with an error (for instance a driver error), you get a
  message "No valid host was found." with an empty reason

  It would help to have a more meaningful message when possible in order
  to diagnose the problem

  This would result for instance in having a message like

      Error: No valid host was found. Error from host: precise64 (node
  precise64): InstanceDeployFailure: Image container format not
  supported (ami) ].

  instead of just (as it is currently)

      Error: No valid host was found.

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