参考链接 报错信息如下：
代码语言：javascript复制[root@rabbitmq3 rabbitmq]# rabbitmqctl stop_app
Stopping node rabbit@rabbitmq3 ...
Error: unable to connect to node rabbit@rabbitmq3: nodedown
DIAGNOSTICS
===========
attempted to contact: [rabbit@rabbitmq3]
rabbit@rabbitmq3:
* connected to epmd (port 4369) on rabbitmq3
* epmd reports node 'rabbit' running on port 25672
* TCP connection succeeded but Erlang distribution failed
* suggestion: hostname mismatch?
* suggestion: is the cookie set correctly?
current node details:
- node name: rabbitmqctl1704@rabbitmq3
- home dir: /var/lib/rabbitmq
- cookie hash: t Or9UGpg M4TGJbQMie7w==解决步骤： step1 查询mq的进程
ps -ef | grep rabbitmq
step2 杀掉mq进程
ps -ef | grep rabbitmq | grep -v grep | awk ‘{print $2}’ | xargs kill -9
step3 启动mq
rabbitmq-server -detached
step4 在查询mq的状态 rabbitmqctl status
代码语言：javascript复制[root@rabbitmq2 rabbitmq]# ps -ef | grep rabbitmq ——查询mq的进程
root 1303 1273 0 01:02 pts/0 00:00:00 ping rabbitmq1
root 1304 1273 0 01:02 pts/0 00:00:00 ping rabbitmq3
rabbitmq 1408 1 1 01:16 ? 00:00:18 /usr/lib64/erlang/erts-5.10.4/bin/beam -W w -K true -A30 -P 1048576 -- -root /usr/lib64/erlang -progname erl -- -home /var/lib/rabbitmq -- -pa /usr/lib/rabbitmq/lib/rabbitmq_server-3.3.5/sbin/../ebin -noshell -noinput -s rabbit boot -sname rabbit@rabbitmq2 -boot start_sasl -config /etc/rabbitmq/rabbitmq -kernel inet_default_connect_options [{nodelay,true}] -sasl errlog_type error -sasl sasl_error_logger false -rabbit error_logger {file,"/var/log/rabbitmq/rabbit@rabbitmq2.log"} -rabbit sasl_error_logger {file,"/var/log/rabbitmq/rabbit@rabbitmq2-sasl.log"} -rabbit enabled_plugins_file "/etc/rabbitmq/enabled_plugins" -rabbit plugins_dir "/usr/lib/rabbitmq/lib/rabbitmq_server-3.3.5/sbin/../plugins" -rabbit plugins_expand_dir "/var/lib/rabbitmq/mnesia/rabbit@rabbitmq2-plugins-expand" -os_mon start_cpu_sup false -os_mon start_disksup false -os_mon start_memsup false -mnesia dir "/var/lib/rabbitmq/mnesia/rabbit@rabbitmq2" -kernel inet_dist_listen_min 25672 -kernel inet_dist_listen_max 25672
rabbitmq 1423 1 0 01:16 ? 00:00:00 /usr/lib64/erlang/erts-5.10.4/bin/epmd -daemon
rabbitmq 1480 1408 0 01:16 ? 00:00:00 inet_gethost 4
rabbitmq 1481 1480 0 01:16 ? 00:00:00 inet_gethost 4
root 11655 1273 0 01:45 pts/0 00:00:00 grep --color=auto rabbitmq
[root@rabbitmq2 rabbitmq]# ps -ef | grep rabbitmq | grep -v grep | awk '{print $2}' | xargs kill -9 ——杀掉mq进程
[1]- Killed ping rabbitmq1 (wd: ~)
(wd now: /var/lib/rabbitmq)
[2] Killed ping rabbitmq3 (wd: ~)
(wd now: /var/lib/rabbitmq)
[root@rabbitmq2 rabbitmq]# rabbitmq-server -detached ——启动mq
Warning: PID file not written; -detached was passed.
[root@rabbitmq2 rabbitmq]# rabbitmqctl status ——查询mq的状态
Status of node rabbit@rabbitmq2 ...
[{pid,11738},
{running_applications,[{os_mon,"CPO CXC 138 46","2.2.14"},
{xmerl,"XML parser","1.3.6"},
{mnesia,"MNESIA CXC 138 12","4.11"},
{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] [async-threads:30] [hipe] [kernel-poll:true]n"},
{memory,[{total,39108744},
{connection_procs,0},
{queue_procs,0},
{plugins,0},
{other_proc,16463696},
{mnesia,55032},
{mgmt_db,0},
{msg_index,0},
{other_ets,720656},
{binary,1090360},
{code,16704494},
{atom,602729},
{other_system,3471777}]},
{alarms,[]},
{listeners,[]},
{vm_memory_high_watermark,0.4},
{vm_memory_limit,771307929},
{disk_free_limit,50000000},
{disk_free,20360318976},
{file_descriptors,[{total_limit,924},
{total_used,0},
{sockets_limit,829},
{sockets_used,0}]},
{processes,[{limit,1048576},{used,86}]},
{run_queue,1},
{uptime,12}]
...done.
[root@rabbitmq2 rabbitmq]# rabbitmqctl stop_app
Stopping node rabbit@rabbitmq2 ...
...done.
[root@rabbitmq2 rabbitmq]#
[root@rabbitmq3 ~]# rabbitmqctl stop_app ——执行成功
Stopping node rabbit@rabbitmq3 ...
...done.
[root@rabbitmq3 ~]#
[root@rabbitmq3 ~]# rabbitmqctl join_cluster --ram rabbit@rabbitmq1
Clustering node rabbit@rabbitmq3 with rabbit@rabbitmq1 ...
...done.
[root@rabbitmq3 ~]# rabbitmqctl start_app
Starting node rabbit@rabbitmq3 ...
...done.
[root@rabbitmq3 ~]# 
