title: RabbitMQ with docker-compose is not restoring data
body: <p>I want to use rabbitMQ, for this I'm using this <code>docker-compose.yml</code> file:</p>
  
  <pre><code>version: '2'
  services:
    rabbitmq:
      image: rabbitmq:management
      ports:
      - "5672:5672"
      - "15672:15672"
      volumes:
      - /tmp_data:/var/lib/rabbitmq
  </code></pre>
  
  <p>it works as expected.</p>
  
  <p>I'm entering some users over the admin GUI interface.</p>
  
  <p>But when i delete the container, I was expecting to still have the created users.</p>
  
  <p>But it seems, that rabbitMQ is not saving it in the folder I specified.<br>
  I was going through the documentation, but i haven't found any other folder where this configurations are saved</p>
  
  <p>Thanks for you help.</p>