Openstack-newton创建实例失败

按照官方文档做的Openstack-newton，创建实例失败

消息      No valid host was found. There are not enough hosts available.      编码      500      详情        File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 496, in build_instances    context, request_spec, filter_properties)  File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 567, in _schedule_instances    hosts = self.scheduler_client.select_destinations(context, spec_obj)  File "/usr/lib/python2.7/site-packages/nova/scheduler/utils.py", line 370, in wrapped    return func(*args, **kwargs)  File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 51, in select_destinations    return self.queryclient.select_destinations(context, spec_obj)  File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 37, in __run_method    return getattr(self.instance, __name)(*args, **kwargs)  File "/usr/lib/python2.7/site-packages/nova/scheduler/client/query.py", line 32, in select_destinations    return self.scheduler_rpcapi.select_destinations(context, spec_obj)  File "/usr/lib/python2.7/site-packages/nova/scheduler/rpcapi.py", line 126, in select_destinations    return cctxt.call(ctxt, 'select_destinations', **msg_args)  File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 169, in call    retry=self.retry)  File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 97, in _send    timeout=timeout, retry=retry)  File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 464, in send    retry=retry)  File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 455, in _send    raise result