2017-02-28 08:37:25.753 21 WARNING nova.scheduler.utils [req-f0bca9db-bc65-47a8-9be1-bbf29cb45bdc 62d2ea98dead48a29a9c7c60ee54829b 1cb44e090edf4a4dbe19dd4545a923a7 - - -] [instance: 651e5153-2dc1-4c70-8366-229d96bd51b6] Setting instance to ERROR state.
2017-02-28 08:42:37.853 21 WARNING nova.scheduler.utils [req-86adab62-acb5-46eb-948b-6242e5e3f70a 62d2ea98dead48a29a9c7c60ee54829b 1cb44e090edf4a4dbe19dd4545a923a7 - - -] Failed to compute_task_build_instances: No valid host was found. There are not enough hosts available.
Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 199, in inner
    return func(*args, **kwargs)

  File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 104, in select_destinations
    dests = self.driver.select_destinations(ctxt, spec_obj)

  File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 74, in select_destinations
    raise exception.NoValidHost(reason=reason)

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

2017-02-28 08:42:37.854 21 WARNING nova.scheduler.utils [req-86adab62-acb5-46eb-948b-6242e5e3f70a 62d2ea98dead48a29a9c7c60ee54829b 1cb44e090edf4a4dbe19dd4545a923a7 - - -] [instance: f00eec36-1df4-4a4c-a79c-8bf0dca172bd] Setting instance to ERROR state.