问题描述：在使用命令/sbin/service rabbitmq-server start启动Rabbitmq时，报：
Job for rabbitmq-server.service failed because the control process exited with error code. See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.根据以上错误信息，使用“journalctl -xe”命令查看启动失败日志：
[root@192 bin]# journalctl -xe
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit rabbitmq-server.service has begun starting up. 1月 08 19:12:46 sanyue rabbitmq-server[10306]: /usr/lib/rabbitmq/bin/rabbitmq-server: line 85: erl: command not found 1月 08 19:12:46 sanyue systemd[1]: rabbitmq-server.service: main process exited, code=exited, status=127/n/a 1月 08 19:12:46 sanyue rabbitmqctl[10473]: /usr/lib/rabbitmq/bin/rabbitmqctl: line 32: exec: escript: not found 1月 08 19:12:46 sanyue systemd[1]: rabbitmq-server.service: control process exited, code=exited status=127 1月 08 19:12:46 sanyue systemd[1]: Failed to start RabbitMQ broker. -- Subject: Unit rabbitmq-server.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit rabbitmq-server.service has failed. -- -- The result is failed. 
通过上面描述中，发现是rabbitmq-server文件第85没有找到erlang。
解决方法：在rabbitmq-server文件第85行处添加erlang的环境变量
然后执行启动Rabbitmq命令，启动成功。使用/sbin/service rabbitmq-server status查看rabbit状态
