NoValidHost(reason="") openstack 创建虚机报错nova.exception.NoValidHost: No

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消息      No valid host was found.       编码      500      详情      Traceback (most recent call last):  File "/var/lib/kolla/venv/lib/python3.6/site-packages/nova/conductor/manager.py", line 1547, in schedule_and_build_instances    instance_uuids, return_alternates=True)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/nova/conductor/manager.py", line 908, in _schedule_instances    return_alternates=return_alternates)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/nova/scheduler/client/query.py", line 42, in select_destinations    instance_uuids, return_objects, return_alternates)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/nova/scheduler/rpcapi.py", line 160, in select_destinations    return cctxt.call(ctxt, 'select_destinations', **msg_args)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_messaging/rpc/client.py", line 192, in call    retry=self.retry, transport_options=self.transport_options)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_messaging/transport.py", line 128, in _send    transport_options=transport_options)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 691, in send    transport_options=transport_options)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 681, in _send    raise resultnova.exception_Remote.NoValidHost_Remote: No valid host was found. Traceback (most recent call last):  File "/var/lib/kolla/venv/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 241, in inner    return func(*args, **kwargs)  File "/var/lib/kolla/venv/lib/python3.6/site-packages/nova/scheduler/manager.py", line 209, in select_destinations    raise exception.NoValidHost(reason="")nova.exception.NoValidHost: No valid host was found.