rabbitmq Error unable to connect to node rabbit@localhost nodedown

打开openstack报错，Error:Unable to retrieve instances.
猜想肯定是neutron的错误，查询neutron状态，果然没有起，手动启动也报错
查询neutron日志 /var/log/neutron/server.log 有如下错误：

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2015-05-25 10:09:08.489 7123 ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server on 172.16.37.211:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 1 seconds.
2015-05-25 10:09:09.499 7123 DEBUG oslo_messaging._drivers.impl_rabbit [-] Received recoverable error from kombu: on_error /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py:790

启动RabbitMQ的报错
搜索关键字：Error: unable to connect to node rabbit@localhost: nodedown，找到如下解决方式

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# systemctl enable rabbitmq-server.service
# systemctl start rabbitmq-server.service
# rabbitmqctl start_app

成功启动rabbitmq

启动neutrou-server，openstack恢复正常

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# systemctl start neutron-server.service