报错如下

Error: unable to perform an operation on node 'rabbit@localhost'. Please see diagnostics information and suggestions below.

Most common reasons for this are:

 * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
 * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
 * Target node is not running

In addition to the diagnostics info below:

 * See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node rabbit@localhost
 * If target node is configured to use long node names, don't forget to use --longnames with CLI tools

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: 'rabbitmqcli-232-rabbit@localhost'
 * effective user's home directory: /var/lib/rabbitmq
 * Erlang cookie hash: f6FBQkwOCP/Ifjkkf8mVkw==

解决办法:

查找 .erlang.cookie的位置

find / -name .erlang.cookie

/home/efc/.erlang.cookie
/var/lib/rabbitmq/.erlang.cookie

把两个文件中的内容改为一致, 重启 rabbitmq 即可

systemctl restart rabbitmq-server