title: How does one remove a Docker image?
body: <p>I'm running Docker under Vagrant under OS X 10.8.4  (Mountain Lion), and whenever I try to delete a saved image, I get an error:</p>
  
  <pre><code>$ docker rmi some-image-id
  2013/07/15 hh:mm:ss unexpected JSON input
  </code></pre>
  
  <p>According to the <code>rmi</code> help, the proper syntax is <code>docker rmi IMAGE [IMAGE...]</code>, and I'm not sure what to make of that.</p>
  
  <p>How can I delete an image?</p>
  
  <pre><code>$ docker version
  Client version: 0.4.8
  Server version: 0.4.8
  Go version: go1.1
  </code></pre>
  
  <p> </p>
  
  <pre><code>$docker info
  Containers: 1
  Images: 3
  </code></pre>
  
  <p>Interestingly, when I run <code>docker ps</code>, no containers show up at all. Running <code>docker images</code> shows four (4) <code>base</code> images and one (1) <code>node</code> image.</p>