标签：
今天在搭建OpenStack的时候需要安装RabbitMQ，可是使用yum install rabbitmq-server安装之后，按照OpenStack官方提供的文档修改guest用户密码的时候却出现了如下错误：
[root@controller ~]# rabbitmqctl change_password guest Rabbit123 Changing password for user "guest" ... Error: unable to connect to node rabbit@controller: nodedown DIAGNOSTICS =========== nodes in question: [rabbit@controller] hosts, their running nodes and ports: - controller: [{rabbitmqctl3435,40060}] current node details: - node name: rabbitmqctl3435@controller - home dir: /var/lib/rabbitmq - cookie hash: KkWnl06AR+v86hEhVTp8/g== [root@controller ~]#
殊不知，这并不是修改密码的命令除了问题，而是安装启动后就出现的问题。在启动服务后，在命令行输入：rabbitmqctl status，同样出现上述问题，如下：
[root@controller ~]# rabbitmqctl status Status of node rabbit@controller ... Error: unable to connect to node rabbit@controller: nodedown DIAGNOSTICS =========== nodes in question: [rabbit@controller] hosts, their running nodes and ports: - controller: [{rabbitmqctl3560,54352}] current node details: - node name: rabbitmqctl3560@controller - home dir: /var/lib/rabbitmq - cookie hash: KkWnl06AR+v86hEhVTp8/g== [root@controller ~]#
网上有人说是hostname的问题，结果测试了一下发现不行呀。
解决方案：执行如下两条命令：
# /sbin/service rabbitmq-server stop
# /sbin/service rabbitmq-server start
# rabbitmqctl status 测试正确，结果如下：
[root@compute1 home]# /sbin/service rabbitmq-server stop Redirecting to /bin/systemctl stop rabbitmq-server.service [root@compute1 home]# /sbin/service rabbitmq-server start Redirecting to /bin/systemctl start rabbitmq-server.service [root@compute1 home]# rabbitmqctl status Status of node rabbit@compute1 ... [{pid,22133}, {running_applications,[{rabbit,"RabbitMQ","3.1.5"}, {os_mon,"CPO CXC 138 46","2.2.14"}, {mnesia,"MNESIA CXC 138 12","4.11"}, {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:6:6] [async-threads:30] [hipe] [kernel-poll:true]\n"}, {memory,[{total,36056032}, {connection_procs,2800}, {queue_procs,5600}, {plugins,0}, {other_proc,13586448}, {mnesia,59920}, {mgmt_db,0}, {msg_index,22280}, {other_ets,739304}, {binary,7880}, {code,16441504}, {atom,594537}, {other_system,4595759}]}, {vm_memory_high_watermark,0.4}, {vm_memory_limit,6663997030}, {disk_free_limit,1000000000}, {disk_free,82596229120}, {file_descriptors,[{total_limit,924}, {total_used,3}, {sockets_limit,829}, {sockets_used,1}]}, {processes,[{limit,1048576},{used,127}]}, {run_queue,0}, {uptime,7}] ...done. [root@compute1 home]#
再次输入修改密码命令：rabbitmqctl change_password guest Rabbit123成功
[root@controller ~]# rabbitmqctl change_password guest Rabbit123 Changing password for user "guest" ... ...done. [root@controller ~]#
[RabbitMQ]Error: unable to connect to node rabbit@compute1: nodedown（CentOS7.0）
标签：
原文地址：http://www.cnblogs.com/Richard-xie/p/4201994.html
