title: Need help identify host name
body: <p>I'm very new to rabbitmq, I installed rabbitmq-server on one EC2 instance, and want to create a consumer on another EC2 instance.</p>
  
  <p>But I'm getting this error:</p>
  
  <pre><code>socket.gaierror: [Errno -2] Name or service not known
  </code></pre>
  
  <p>That's the node status:</p>
  
  <pre><code>ubuntu@ip-10-147-xxx-xxx:~$ sudo rabbitmq-server restart
  ERROR: node with name "rabbit" already running on "ip-10-147-xxx-xxx"
  
  DIAGNOSTICS
  ===========
  
  nodes in question: ['rabbit@ip-10-147-xxx-xxx']
  
  hosts, their running nodes and ports:
  - ip-10-147-xxx-xxx: [{rabbit,46074},{rabbitmqprelaunch4603,51638}]
  
  current node details:
  - node name: 'rabbitmqprelaunch4603@ip-10-147-xxx-xxx'
  - home dir: /var/lib/rabbitmq
  - cookie hash: Gsnt2qHd7wWDEOAOFby=
  </code></pre>
  
  <p>And that's the consumer code:</p>
  
  <pre><code>import pika
  
  cred = pika.PlainCredentials('guest', 'guest')
  conn_params = pika.ConnectionParameters('10-147-xxx-xxx', credentials=cred)
  conn_broker = pika.BlockingConnection(conn_params)
  
  conn_broker = pika.BlockingConnection(conn_params)
  channel = conn_broker.channel()
  channel.exchange_declare(exchange='hello-exchange', type='direct', passive=False, durable=True, auto_delete=False)
  
  channel.queue_declare(queue='hello-queue')
  channel.queue_bind(queue='hello-queue', exchange='hello-exchange', routing_key='hola')
  
  def msg_consumer(channel, method, header, body):
      channel.basic_ack(delivery_tag=method.delivery_tag)
      if body == 'quit':
          channel.basic_cancel(consumer_tag='hello-consumer')
          channel.stop_consuming()
      else:
          print body
  
      return
  
  channel.basic_consume(msg_consumer, queue='hello-queue', consumer_tag='hello-consumer')
  channel.start_consuming()
  </code></pre>