title: Docker hangs while pulling
body: <p>I am trying to run <code>docker run docker/whalesay cowsay boo</code> from the tutorial.</p>
  
  <p>Here is the output I get:</p>
  
  <pre><code>Unable to find image 'docker/whalesay:latest' locally
  latest: Pulling from docker/whalesay
  e190868d63f8: Already exists
  909cd34c6fd7: Already exists
  0b9bfabab7c1: Already exists
  a3ed95caeb02: Pulling fs layer
  00bf65475aba: Already exists
  c57b6bcc83e3: Already exists
  8978f6879e2f: Waiting
  8eed3712d2cf: Download complete
  </code></pre>
  
  <p>It has been 10 minutes but nothing shows up. Is it supposed to take that long?</p>
  
  <p>I tried control+C and re-run the command, and restarting Docker Quickstart Terminal. It's still not solving the problem.</p>