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failed to launch instance: No valid Host was found.

I am on a newly installed CentOS7.1 with packstack running. If I try to launch my first instance, i got this error:

Message

No valid host was found.

Code

500

Details

File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 616, in build_instances request_spec, filter_properties) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 49, in select_destinations context, request_spec, filter_properties) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 35, in __run_method return getattr(self.instance, __name)(*args, **kwargs) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/query.py", line 34, in select_destinations context, request_spec, filter_properties) File "/usr/lib/python2.7/site-packages/nova/scheduler/rpcapi.py", line 108, in select_destinations request_spec=request_spec, filter_properties=filter_properties) File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/client.py", line 152, in call retry=self.retry) File "/usr/lib/python2.7/site-packages/oslo/messaging/transport.py", line 90, in _send timeout=timeout, retry=retry) File "/usr/lib/python2.7/site-packages/oslo/messaging/_drivers/amqpdriver.py", line 408, in send retry=retry) File "/usr/lib/python2.7/site-packages/oslo/messaging/_drivers/amqpdriver.py", line 399, in _send raise result

Any Idea what could be the reason?

Output of "sudo nova-manage service list":

Binary           Host                                 Zone             Status     State Updated_At
nova-consoleauth localhost.localdomain                internal         enabled    :-)   2015-04-05 20:47:16
nova-scheduler   localhost.localdomain                internal         enabled    :-)   2015-04-05 20:47:24
nova-conductor   localhost.localdomain                internal         enabled    :-)   2015-04-05 20:47:24
nova-compute     localhost.localdomain                nova             enabled    :-)   2015-04-05 20:47:00
nova-cert        localhost.localdomain                internal         enabled    :-)   2015-04-05 20:47:24