PID file not written; -detached was passed. ERROR: node with name "rabbit" alread
场景：
使用 sudo rabbitmq-server -detached命令启动rabbitmq时，出现以下提示
Warning: PID file not written; -detached was passed.
ERROR: node with name "rabbit" already running
但是，通过命令sudo rabbitmqctl status又提示rabbitmq没有启动
解决：
ps aux | grep erl
kill -9 该进程