rabbitmq 高可用集群部署踩坑

大家好，我是早九晚十二，目前是做运维相关的工作。写博客是为了积累，希望大家一起进步！
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问题描述

今天在搭建rabbitmq集群时使用rabbitmqctl status碰到如下问题：

Status of node rabbit@iZwz9cxht3eh2v5xk5yqx4Z ...
Error: unable to perform an operation on node 'rabbit@iZwz9cxht3eh2v5xk5yqx4Z'. 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 http://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node rabbit@iZwz9cxht3eh2v5xk5yqx4Z

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

attempted to contact: [rabbit@iZwz9cxht3eh2v5xk5yqx4Z]

rabbit@iZwz9cxht3eh2v5xk5yqx4Z:
  * unable to connect to epmd (port 4369) on iZwz9cxht3eh2v5xk5yqx4Z: nxdomain (non-existing domain)


Current node details:
 * node name: 'rabbitmqcli-10319-rabbit@iZwz9cxht3eh2v5xk5yqx4Z'
 * effective user's home directory: /var/lib/rabbitmq
 * Erlang cookie hash: 48iUfALoSn26msGydd+V/g==

问题分析

主要看错误提示信息

• 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

我们可以根据上面错误依次排查

提示一：*无法访问目标节点（例如，由于主机名解析、TCP连接或防火墙问题）

#查看firewall状态
firewall-cmd --state
#查看iptable策略
iptables -nL

提示二：*CLI工具无法与服务器进行身份验证（例如，由于CLI工具的Erlang cookie与服务器的Erlang cookie不匹配）

查看/var/lib/rabbitmq/.erlang.cookie文件md5是否与其他的cookie一致，一般windows会有多个.erlang.cookie文件，只需要将其中一个复制过去即可

提示三：*目标节点未运行

#查看rabbitmq是否为running状态
systemctl status rabbitmq-server

如果上述提示无法解决问题，那么再继续往下看

rabbit@iZwz9cxht3eh2v5xk5yqx4Z: * unable to connect to epmd (port
4369) on iZwz9cxht3eh2v5xk5yqx4Z: nxdomain (non-existing domain)

提示四：*无法连接到iZwz9cxht3eh2v5xk5yqx4Z上的epmd（端口4369）

该提示是表示无法解析到主机名（我本人的是这个问题），需要修改配置文件rabbitmq1为自己的主机名，然后重启。

[root@iZwz9cxht3eh2v5xk5yqx4Z rabbitmq-server-3.7.9]# cat /etc/rabbitmq/rabbitmq-env.conf 
RABBITMQ_NODENAME=rabbit@rabbitmq1

码字不易，希望大家有用到的可以三连支持一波。哪里有问题的话可以指出，谢谢大家！