title: Can you define optional docker-compose services?
body: <p>Is there a way to define a Docker Compose service such that it is only brought <code>up</code> when you explicitly request it?</p>
  
  <p>That is to say:</p>
  
  <pre><code>docker-compose up
  </code></pre>
  
  <p>would not start it, but</p>
  
  <pre><code>docker-compose up optional_service
  </code></pre>
  
  <p>would.</p>