title: Why is RabbitMQ not persisting messages on a durable queue?
body: <p>I am using RabbitMQ with Django through Celery. I am using the most basic setup:</p>
  
  <pre><code># RabbitMQ connection settings
  BROKER_HOST = 'localhost'
  BROKER_PORT = '5672'
  BROKER_USER = 'guest'
  BROKER_PASSWORD = 'guest'
  BROKER_VHOST = '/'
  </code></pre>
  
  <p>I imported a Celery task and queued it to run one year later. From the iPython shell:</p>
  
  <pre><code>In [1]: from apps.test_app.tasks import add
  
  In [2]: dt=datetime.datetime(2012, 2, 18, 10, 00)
  
  In [3]: add.apply_async((10, 6), eta=dt)
  DEBUG:amqplib:Start from server, version: 8.0, properties: {u'information': 'Licensed under the MPL.  See http://www.rabbitmq.com/', u'product': 'RabbitMQ', u'version': '2.2.0', u'copyright': 'Copyright (C) 2007-2010 LShift Ltd., Cohesive Financial Technologies LLC., and Rabbit Technologies Ltd.', u'platform': 'Erlang/OTP'}, mechanisms: ['PLAIN', 'AMQPLAIN'], locales: ['en_US']
  DEBUG:amqplib:Open OK! known_hosts []
  DEBUG:amqplib:using channel_id: 1
  DEBUG:amqplib:Channel open
  DEBUG:amqplib:Closed channel #1
  Out[3]: &lt;AsyncResult: cfc507a1-175f-438e-acea-8c989a120ab3&gt;
  </code></pre>
  
  <p>RabbitMQ received this message in the celery queue:</p>
  
  <pre><code>$  rabbitmqctl list_queues name messages durable
  Listing queues ...
  KTMacBook.local.celeryd.pidbox  0   false
  celery  1   true
  celeryctl_KTMacBook.local   0   true
  ...done.
  </code></pre>
  
  <p>I then killed RabbitMQ by hitting control-C followed by 'a' to abort. When I start the server again and check it with rabbitmqctl, it says that there are no messages in the celery queue:</p>
  
  <pre><code>$  rabbitmqctl list_queues name messages durable
  Listing queues ...
  celery  0   true
  celeryctl_KTMacBook.local   0   true
  ...done.
  </code></pre>
  
  <p>The celery queue was durable. Why were the messages not persisted? What do I need to do to make the messages persistent?</p>