在Linux7下，启动rabbitmq失败，出现如下的错误：
        Apr 05 00:47:17 manager rabbitmqctl[2021]: - node name: 'rabbitmq-cli-35@manager'
       Apr 05 00:47:17 manager rabbitmqctl[2021]: - home dir: /var/lib/rabbitmq
       Apr 05 00:47:17 manager rabbitmqctl[2021]: - cookie hash: kCSAuoPoRL75iEoeBgEntg==
      Apr 05 00:47:17 manager systemd[1]: Failed to start RabbitMQ broker.
      -- Subject: Unit rabbitmq-server.service has failed
      -- Defined-By: systemd
      -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
         -- Unit rabbitmq-server.service has failed.
       -- The result is failed.
     Apr 05 00:47:17 manager systemd[1]: Unit rabbitmq-server.service entered failed state.
    Apr 05 00:47:17 manager systemd[1]: rabbitmq-server.service failed.
    Apr 05 00:47:17 manager polkitd[838]: Unregistered Authentication Agent for unix-                   
    Apr 05 00:49:45 manager systemd[1]: Starting RabbitMQ broker...
    -- Subject: Unit rabbitmq-server.service has begun start-up
    -- Defined-By: systemd
    -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
    -- Unit rabbitmq-server.service has begun starting up.
     Apr 05 00:50:07 manager rabbitmq-server[2140]: ERROR: epmd error for host manager: address  
     Apr 05 00:50:08 manager rabbitmqctl[2229]: Stopping and halting node rabbit@manager ...
     Apr 05 00:50:15 manager rabbitmqctl[2229]: Error: unable to connect to node rabbit@manager:  
     Apr 05 00:50:36 manager rabbitmqctl[2229]: DIAGNOSTICS
    Apr 05 00:50:36 manager rabbitmqctl[2229]: ===========
    Apr 05 00:50:36 manager rabbitmqctl[2229]: attempted to contact: [rabbit@manager]
   Apr 05 00:50:36 manager rabbitmqctl[2229]: rabbit@manager:
   Apr 05 00:50:36 manager rabbitmqctl[2229]: * unable to connect to epmd (port 4369) on manager:      address (cannot connect to host/port)
    Apr 05 00:50:36 manager rabbitmqctl[2229]: current node details:
   -- The result is failed.
   Apr 05 00:50:36 manager systemd[1]: Unit rabbitmq-server.service entered failed state.
    Apr 05 00:50:36 manager systemd[1]: rabbitmq-server.service failed.
   Apr 05 00:50:36 manager polkitd[838]: Unregistered Authentication Agent for unix-process:2134:61432 (system bus name :1.24, object path /org/freedesktop/PolicyKit1/Aut

解决办法：
添加hostname 和ip到在/etc/hosts文件中。