title: How to secure Redis Cluster?
body: <p>I know Redis Cluster is still unstable, but it's been passing all the unit tests since quite a long time so I started using it.</p>
  
  <p>I would like to know if a Redis Cluster would work well if the nodes required authentication. I'm incline to think yes, because they connect through a different port and use a different protocol, but I'm not sure and couldn't find any documentation or anything on the <a href="http://redis.io/topics/cluster-spec/" rel="noreferrer">spec</a> to confirm this.</p>
  
  <p>Also, if the redis cluster protocol flies over the authentication barrier, isn't it a hole in security ? Could my database be accessed by the outside world ? (the port at least must be accessible so it can talk to the other nodes)</p>