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[april <xiaolixu@xxxxxxxxxx>]

Public bug reported:

nova version :　2015.1.1-1.el7

Try to nova boot one instance on specific compute node.  the instance is
in error state due to Invalid host found . openstack-nova-compute and
neuton-openvswitch-agent are running normally on the compute nodes .

[root@oc-perf-neutron-1 ~(keystone_admin)]$ nova --os-tenant-name chen show chen_cn30-2
....
| fault                                | {"message": "No valid host was found. There are not enough hosts available.", "code": 500, "details": "  File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 671, in build_instances |
|                                      |     request_spec, filter_properties)                  


[root@oc-perf-nova-1 nova]# tail -f nova-conductor.log

  File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 86, in select_destinations
    filter_properties)

  File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 80, in select_destinations
    raise exception.NoValidHost(reason=reason)

NoValidHost: No valid host was found. There are not enough hosts
available.

2015-09-21 08:39:48.071 5576 WARNING nova.scheduler.utils [req-667a06a7
-437c-4cba-86b1-31691c0f5cd3 4a0fd2556f7a4460a2d36ae0749b64be
33015025419646a692dc68d23456a48c - - -] [instance: 7cabfe46-ae2f-
43b8-b4f6-ee5753e41a33] Setting instance to ERROR state.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1498367

Title:
  Invalid host found when nova boot

Status in OpenStack Compute (nova):
  New

Bug description:
  nova version :　2015.1.1-1.el7

  Try to nova boot one instance on specific compute node.  the instance
  is in error state due to Invalid host found . openstack-nova-compute
  and neuton-openvswitch-agent are running normally on the compute nodes
  .

  [root@oc-perf-neutron-1 ~(keystone_admin)]$ nova --os-tenant-name chen show chen_cn30-2
  ....
  | fault                                | {"message": "No valid host was found. There are not enough hosts available.", "code": 500, "details": "  File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 671, in build_instances |
  |                                      |     request_spec, filter_properties)                  

  
  [root@oc-perf-nova-1 nova]# tail -f nova-conductor.log

    File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 86, in select_destinations
      filter_properties)

    File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 80, in select_destinations
      raise exception.NoValidHost(reason=reason)

  NoValidHost: No valid host was found. There are not enough hosts
  available.

  2015-09-21 08:39:48.071 5576 WARNING nova.scheduler.utils [req-
  667a06a7-437c-4cba-86b1-31691c0f5cd3 4a0fd2556f7a4460a2d36ae0749b64be
  33015025419646a692dc68d23456a48c - - -] [instance: 7cabfe46-ae2f-
  43b8-b4f6-ee5753e41a33] Setting instance to ERROR state.

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