1、查看 rabbitMq 的状态。
输入命令：rabbitmqctl status，发现没有报错，但是 rabbit 中的 host 是 root ，并不是 ip 地址，所以连接不上。
2、运行命令：echo 【ip地址】root >> /etc/hosts。
将 RabbitMQ 服务所在的 IP 地址添加到 /etc/hosts 中。
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