title: Docker can't connect to docker daemon
body: <p>After I update my Docker version to <code>0.8.0</code>, I get an error message while entering <code>sudo docker version</code>:</p>
  
  <pre><code>Client version: 0.8.0
  Go version (client): go1.2
  Git commit (client): cc3a8c8
  2014/02/19 12:54:16 Can't connect to docker daemon. Is 'docker -d' running on this host?
  </code></pre>
  
  <p>And I've followed the instructions and entered command <code>sudo docker -d</code>, and I got this:</p>
  
  <pre><code>[/var/lib/docker|2462000b] +job initserver()
  [/var/lib/docker|2462000b.initserver()] Creating server
  open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory[/var/lib/docker|2462000b] -job initserver() = ERR (1)
  2014/02/19 12:55:57 initserver: open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory
  </code></pre>
  
  <p>How do I solve the problem?</p>