一上班就说服务不能用，赶紧解决一下，然后重启服务试试，结果发现是mq没启动

[root@localhost rabbit@localhost]# service rabbitmq-server start
Starting rabbitmq-server: SUCCESS
rabbitmq-server.

然后网页访问管理页

http://127.0.0.1:15672/

无法访问，一下心理就慌了，好不，试了几次都是没有
检查端口占用

[root@localhost ~]# netstat -anp |grep 4369
tcp        0      0 0.0.0.0:4369                0.0.0.0:*                   LISTEN      5582/epmd           
tcp        0      0 :::4369                     :::*                        LISTEN      5582/epmd   

其实上面的是正常的。
查看服务启动脚本

vi /etc/init.d/rabbitmq-server

rabbitmq-server日志

tail /var/log/rabbitmq/startup_log
{"init terminating in do_boot",{error,{cannot_delete_plugins_expand_dir,["/var/lib/rabbitmq/mnesia/rabbit@localhost-plugins-expand",{cannot_delete,"/var/lib/rabbitmq/mnesia/rabbit@localhost-plugins-expand/rabbitmq_web_dispatch-3.5.0/ebin/rabbit_webmachine.beam",eacces}]}}}

最后发现是插件目录权限问题, 修改属主

chown -R rabbitmq:rabbitmq /var/lib/rabbitmq/mnesia/rabbit@localhost-plugins-expand/

【误区】
1、不要随便重置，或者rabbitmqctl reset，重置队列
2、随便禁用插件， /etc/rabbitmq/enabled_plugins
3、 sudo /usr/sbin/rabbitmq-server 报错pid权限不够

【总结】一下，防止后人采坑：
1、检查防火墙

service iptables status

2、检查rabbitmq

[root@localhost rabbit@localhost]# service rabbitmq-server status
Status of node rabbit@localhost ...
Error: unable to connect to node rabbit@localhost: nodedown

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

attempted to contact: [rabbit@localhost]

rabbit@localhost:
  * connected to epmd (port 4369) on localhost
  * epmd reports: node 'rabbit' not running at all
                  no other nodes on localhost
  * suggestion: start the node

current node details:
- node name: 'rabbitmq-cli-7227@localhost'
- home dir: /var/lib/rabbitmq
- cookie hash: upI9R3WzVaK8x5qUau1aHg==

3、localhost 是否能够解析

ping localhost
vi /etc/hosts  //查看host  dns配置

4、RabbitMQ日志

日志目录
tail /var/log/rabbitmq/startup_log

5、插件目录权限

ll /var/lib/rabbitmq/mnesia/
chown -R rabbitmq:rabbitmq /var/lib/rabbitmq/mnesia/rabbit@localhost-plugins-expand/