RabbitMQ报错 Error: unable to connect to node rabbit@xxxxx: nodedown

错误现象如下：

[root@node ~]# rabbitmqctl status
Status of node 'rabbitmq@node1' ...
Error: unable to connect to node 'rabbitmq@node1': nodedown

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

attempted to contact: ['rabbitmq@node1']

rabbitmq@node1:
  * connected to epmd (port 4369) on node1
  * epmd reports: node 'rabbitmq' not running at all
                  no other nodes on node1
  * suggestion: start the node

current node details:
- node name: 'rabbitmq-cli-2723@node1'
- home dir: /var/lib/rabbitmq
- cookie hash: paC7ovvAFpvPV6YMwt1Qmw==

解决办法：

[root@node1 ~]# ps -ef | grep rabbitmq | grep -v grep | awk '{print $2}' | xargs kill -9 #将mq的进程杀掉
[root@node1 ~]# rabbitmq-server -detached  #启动mq

如果是集群需要同时执行以上命令：

[root@node1 ~]# ps -ef | grep rabbitmq | grep -v grep | awk '{print $2}' | xargs kill -9 #将mq的进程杀掉
[root@node2 ~]# ps -ef | grep rabbitmq | grep -v grep | awk '{print $2}' | xargs kill -9 #将mq的进程杀掉
[root@node1 ~]# rabbitmq-server -detached  #启动mq
[root@node2 ~]# rabbitmq-server -detached  #启动mq

[root@node1 ~]# rabbitmqctl status
Status of node 'rabbitmq@node1' ...
[{pid,3541},
 {running_applications,
     [{rabbitmq_stomp,"Embedded Rabbit Stomp Adapter","3.5.4"},
      {rabbitmq_management,"RabbitMQ Management Console","3.5.4"},
      {rabbitmq_management_agent,"RabbitMQ Management Agent","3.5.4"},
      {rabbit,"RabbitMQ","3.5.4"},
      {os_mon,"CPO  CXC 138 46","2.2.7"},
      {rabbitmq_web_dispatch,"RabbitMQ Web Dispatcher","3.5.4"},
      {webmachine,"webmachine","1.10.3-rmq3.5.4-gite9359c7"},
      {mochiweb,"MochiMedia Web Server","2.7.0-rmq3.5.4-git680dba8"},
      {amqp_client,"RabbitMQ AMQP Client","3.5.4"},
      {xmerl,"XML parser","1.2.10"},
      {inets,"INETS  CXC 138 49","5.7.1"},
      {mnesia,"MNESIA  CXC 138 12","4.5"},
      {sasl,"SASL  CXC 138 11","2.1.10"},
      {stdlib,"ERTS  CXC 138 10","1.17.5"},
      {kernel,"ERTS  CXC 138 10","2.14.5"}]},
 {os,{unix,linux}},
 {erlang_version,
     "Erlang R14B04 (erts-5.8.5) [source] [64-bit] [smp:48:32] [rq:48] [async-threads:64] [kernel-poll:true]\n"},
 {memory,
     [{total,229565920},
      {connection_readers,1907416},
      {connection_writers,436688},
      {connection_channels,986792},
      {connection_other,2522808},
      {queue_procs,18627568},
      {queue_slave_procs,58605376},
      {plugins,9414816},
      {other_proc,2159864},
      {mnesia,7245736},
      {mgmt_db,16037984},
      {msg_index,1422280},
      {other_ets,4345800},
      {binary,80049216},
      {code,17619160},
      {atom,1569041},
      {other_system,6615375}]},
 {alarms,[]},
 {listeners,[{clustering,25672,"::"},{amqp,5672,"::"},{stomp,61613,"::"}]},
 {vm_memory_high_watermark,0.4},
 {vm_memory_limit,1717986918},
 {disk_free_limit,50000000},
 {disk_free,16978259968},
 {file_descriptors,
     [{total_limit,924},
      {total_used,411},
      {sockets_limit,829},
      {sockets_used,82}]},
 {processes,[{limit,1048576},{used,4282}]},
 {run_queue,0},
 {uptime,19}]

如果还出现问题：
1、检查/etc/hosts 是否配置node1，

[root@node1 ~]# vim /etc/hosts
127.0.0.1 node1

2、hostname 是否设置

[root@node1 ~]# vim /etc/sysconfig/network
HOSTNAME="node1"

或者

[root@node1 ~]# hostname node1
[root@node1 ~]# hostname
node1