RabbitMQ启动出错：- unable to connect to epmd on xxxx: timeout (timed out)

[root@www ~]# /etc/init.d/rabbitmq-server start
Starting rabbitmq-server: FAILED - check /var/log/rabbitmq/startup_{log, _err}
rabbitmq-server.

[root@www ~]# /etc/init.d/rabbitmq-server status
Status of node rabbit@www ...
Error: unable to connect to node rabbit@www: nodedown

DIAGNOSTICS
===========

nodes in question: [rabbit@www]

hosts, their running nodes and ports:
- unable to connect to epmd on www: address (cannot connect to host/port)

current node details:
- node name: rabbitmqctl11766@www
- home dir: /var/lib/rabbitmq
- cookie hash: xxxxxxxxxx==

[root@www ~]#

[root@www ~]# tailf  /var/log/rabbitmq/startup_log

RabbitMQ 3.1.5. Copyright (C) 2007-2013 GoPivotal, Inc.
##  ##      Licensed under the MPL.  See http://www.rabbitmq.com/ ##  ##
##########  Logs: /var/log/rabbitmq/rabbit@www.log
######  ##        /var/log/rabbitmq/rabbit@www-sasl.log
##########
Starting broker... completed with 0 plugins.
ERROR: epmd error for host "www": address (cannot connect to host/port)
[FAILED]

[root@blockstorage ~]# vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
127.0.0.1       www
192.168.155     www