title: Docker-compose ps not showing any output
body: <p>I am trying to run docker-compose ps and docker-compose logs and neither are showing any output. I was able to run docker-compose up and verified the correct containers are started with docker ps. However docker-compose logs and ps dont show anything</p>
  
  <pre><code>&gt; sudo docker-compose -f /opt/docker-compose/server1-compose.yml ps
  Name   Command   State   Ports 
  ------------------------------
  
  &gt; sudo docker-compose -f /opt/docker-compose/server1-compose.yml logs
  Attaching to 
  </code></pre>
  
  <p>Both commands are returning intended output. What is wrong here?
  docker-compose version: 1.4.2
  Docker version 1.7.1, build 786b29d</p>