我的操作步骤：
在CentOS系统下面，我运行下面的命令：

[vagrant@rabbitmq-centos ~]$ sudo rabbitmq-server start

  ##  ##
  ##  ##      RabbitMQ 3.7.14. Copyright (C) 2007-2019 Pivotal Software, Inc.
  ##########  Licensed under the MPL.  See https://www.rabbitmq.com/
  ######  ##
  ##########  Logs: /var/log/rabbitmq/rabbit@rabbitmq-centos.log
                    /var/log/rabbitmq/rabbit@rabbitmq-centos_upgrade.log

              Starting broker...
 completed with 0 plugins.
^Cwarning: the VM is running with native name encoding of latin1 which may cause Elixir to malfunction as it expects utf8. Please ensure your locale is set to UTF-8 (which can be verified by running "locale" in your shell)
Stopping and halting node rabbit@rabbitmq-centos ...
Gracefully halting Erlang VM
[vagrant@rabbitmq-centos ~]$

这样的问题是，当前的terminal不能干其他事情了，只能Ctrl + C，关掉rabbitmq-server.
然后，尝试老师课程中的命令（多加一个&)

[vagrant@rabbitmq-centos ~]$ sudo rabbitmq-server start &
[1] 9369
[vagrant@rabbitmq-centos ~]$
  ##  ##
  ##  ##      RabbitMQ 3.7.14. Copyright (C) 2007-2019 Pivotal Software, Inc.
  ##########  Licensed under the MPL.  See https://www.rabbitmq.com/
  ######  ##
  ##########  Logs: /var/log/rabbitmq/rabbit@rabbitmq-centos.log
                    /var/log/rabbitmq/rabbit@rabbitmq-centos_upgrade.log

              Starting broker...
 completed with 0 plugins.

这样，系统会停在那里，只要点击一下回车，terminal就可以用了。

问题：

但是，执行命令 sudo rabbitmq-server start & 之后，我无法通过一下两个命令关闭RabbitMQ Server:

sudo rabbitmq-server stop
sudo rabbitmqctl stop_app

我系统里的运行结果如下：

[vagrant@rabbitmq-centos ~]$ sudo rabbitmq-server stop
ERROR: node with name "rabbit" already running on "rabbitmq-centos"
[vagrant@rabbitmq-centos ~]$ sudo rabbitmqctl stop_app
warning: the VM is running with native name encoding of latin1 which may cause Elixir to malfunction as it expects utf8. Please ensure your locale is set to UTF-8 (which can be verified by running "locale" in your shell)
Stopping rabbit application on node rabbit@rabbitmq-centos ...

我现在只能通过ps aux | grep “rabbit”，获得进程后，一个个关掉。
我查资料，可以通过sudo rabbitmq-server status可以查看RabbitMQ的运行状态，但是我运行结果如下：

[vagrant@rabbitmq-centos ~]$ sudo rabbitmq-server status
ERROR: node with name "rabbit" already running on "rabbitmq-centos"

请问怎么要操作才能通过sudo rabbitmq-server stop 这样简单的命令关掉？ 谢谢！