RabbitMQ安装后启动出错：- unable to connect to epmd on blockstorage: timeout (timed out)

　　具体出错信息如下：

[root@blockstorage ~]# rabbitmqctl change_password guest RABBIT_PASS
Changing password for user "guest" ...
Error: unable to connect to node rabbit@blockstorage: nodedown

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

nodes in question: [rabbit@blockstorage]

hosts, their running nodes and ports:
- unable to connect to epmd on blockstorage: timeout (timed out)

current node details:
- node name: rabbitmqctl2309@blockstorage
- home dir: /var/lib/rabbitmq
- cookie hash: 9MAewQpNA2Hn9l2WPQ++rw==

　　解决方案：在/etc/hosts文件中加入一行“127.0.0.1  主机名”即可，加入IP地址和主机名是不行的。

[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       blockstorage
192.168.155     blockstorage

　　然后，启动查看状态皆OK

[root@blockstorage ~]# systemctl start rabbitmq-server.service
[root@blockstorage ~]# rabbitmqctl status
Status of node rabbit@blockstorage ...
[{pid,2378},
 {running_applications,[{rabbit,"RabbitMQ","3.1.5"},
                        {mnesia,"MNESIA  CXC 138 12","4.11"},
                        {os_mon,"CPO  CXC 138 46","2.2.14"},
                        {xmerl,"XML parser","1.3.6"},
                        {sasl,"SASL  CXC 138 11","2.3.4"},
                        {stdlib,"ERTS  CXC 138 10","1.19.4"},
                        {kernel,"ERTS  CXC 138 10","2.16.4"}]},
 {os,{unix,linux}},
 {erlang_version,"Erlang R16B03-1 (erts-5.10.4) [source] [64-bit] [smp:2:2] [async-threads:30] [hipe] [kernel-poll:true]
"},
 {memory,[{total,35634312},
          {connection_procs,2800},
          {queue_procs,5600},
          {plugins,0},
          {other_proc,13661600},
          {mnesia,60544},
          {mgmt_db,0},
          {msg_index,22776},
          {other_ets,779744},
          {binary,10464},
          {code,16441504},
          {atom,594537},
          {other_system,4054743}]},
 {vm_memory_high_watermark,0.4},
 {vm_memory_limit,6664211660},
 {disk_free_limit,1000000000},
 {disk_free,82254290944},
 {file_descriptors,[{total_limit,924},
                    {total_used,3},
                    {sockets_limit,829},
                    {sockets_used,1}]},
 {processes,[{limit,1048576},{used,123}]},
 {run_queue,0},
 {uptime,13}]
...done.
[root@blockstorage ~]#