title: Import qcow2 image to docker hub
body: <p>I have prebuild ubuntu14.0.4.1 qcow2 image . I followed the following instruction for importing it to docker hub
  Used virt-tar-out to convert it tar file</p>
  
  <pre><code>sudo virt-tar-out -a /tmp/ubuntu.qcow2 / - | gzip --best &gt; ubuntu.tar.gz
  cat ubuntu.tar.gz | sudo docker import - repo:tag
  </code></pre>
  
  <p>I get the image id</p>
  
  <p>Now when I try run a conatiner from the image I get following error</p>
  
  <blockquote>
    <p>Error response from daemon: No command specified</p>
  </blockquote>
  
  <p>If the I give the command along with docker run command </p>
  
  <blockquote>
    <p>exec: "/bin/sh": stat /bin/sh: no such file or directory <br>
    Error response from daemon: Cannot start container <br>
    c2d0ce1a4bfd9f4784edad53b3669e736f1442b2ba208294b00f242d07dc2208: [8] System error: exec: "/bin/sh": stat /bin/sh: no such file or directory  <br></p>
  </blockquote>
  
  <p>None of the commands are working.</p>
  
  <ul>
  <li>Docker version 1.7.1, build 786b29d</li>
  </ul>
  
  <p>Thanks
  Preeti</p>