title: how do I clean up my docker host machine
body: <p>As I create/debug a docker image/container docker seems to be leaving all sorts of artifacts on my system. (at one point there was a 48 image limit) But the last time I looked there were 20-25 images; <code>docker images</code>.</p>
  
  <p>So the overarching questions are:</p>
  
  <ul>
  <li>how does one properly cleanup?</li>
  <li>as I was manually deleting images more started to arrive. huh?</li>
  <li>how much disk space should I really allocate to the host?</li>
  <li>will running daemons really restart after the next reboot?</li>
  </ul>
  
  <p>and the meta question... what questions have I not asked that need to be?</p>