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[Alvaro Lopez <1424597@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1394268 ***
    https://bugs.launchpad.net/bugs/1394268

** This bug has been marked a duplicate of bug 1394268
   wrong error message when no IP addresses are available

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https://bugs.launchpad.net/bugs/1424597

Title:
  Obscure 'No valid hosts found' if no free fixed IPs left in the
  network

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  If network have no free fixed IPs, new instances failed with 'No valid
  hosts found' without proper explanation.

  Example:

  nova boot foobar --flavor SSD.1 --image cirros --nic net-id=f3f2802a-
  c2a1-4d8b-9f43-cf24d0dc8233

  (There is no free IP left in network f3f2802a-c2a1-4d8b-
  9f43-cf24d0dc8233)

  nova show fb4552e5-50cb-4701-a095-c006e4545c04
  ...
  | status                               | BUILD                                         |

  (few seconds later)

  | fault                                | {"message": "No valid host was found. Exceeded max scheduling attempts 2 for instance fb4552e5-50cb-4701-a095-c006e4545c04. Last exception: [u'Traceback (most recent call last):\                                         |
  |                                      | ', u'  File \"/usr/lib/python2.7/dist-packages/nova/compute/manager.py\", line 2036, in _do", "code": 500, "details": "  File \"/usr/lib/python2.7/dist-packages/nova/conductor/manager.py\", line 612, in build_instances |
  |                                      |     instances[0].uuid)                                                                                                                                                                                                     |
  |                                      |   File \"/usr/lib/python2.7/dist-packages/nova/scheduler/utils.py\", line 161, in populate_retry                                                                                                                           |
  |                                      |     raise exception.NoValidHost(reason=msg)                                                                                                                                                                                |
  | status                               | ERROR                                                                                                                                                                                                                      |

  
  Expected behaviour: Compains about 'No free IP' before attempting to schedule instance.

  See https://bugs.launchpad.net/nova/+bug/1424594 for similar
  behaviour.

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