title: Error "Warning: PID file not written; -detached was passed." Why does it keep happening?
body: <p>I'm very new to <code>RabbitMQ</code>. Following this <a href="http://docs.celeryproject.org/en/latest/getting-started/brokers/rabbitmq.html#installing-rabbitmq-on-macos" rel="nofollow noreferrer">doc</a> provided from <code>Celery</code>, I installed it on Mac OS.</p>
  
  <p>However, when I run <code>RabbitMQ</code> with the command <code>sudo rabbitmq-server</code>, it gives me a warning saying <code>"Warning: PID file not written; -detached was passed."</code> and <code>RabbitMQ</code> seems to be running well since I have a running message from <code>sudo rabbitmqctl status</code>.</p>
  
  <p>Should I do something for the warning message?</p>