title: Failed to start Docker Application Container Engine
body: <p>I am new to Docker, so don't have much idea about it.
  I tried restarting Docker service using command</p>
  <p>service docker restart</p>
  <p>As the command was taking too much of time I did a CTL+C
  Now I am not able to start docker deamon
  Any docker command gives following op</p>
  <blockquote>
  <p>Cannot connect to the Docker daemon. Is the docker daemon running on this host?</p>
  </blockquote>
  <p>I tried starting Docker deamon using</p>
  <blockquote>
  <p>systemctl start docker</p>
  </blockquote>
  <p>But it outputs:</p>
  <blockquote>
  <p>Job for docker.service failed because the control process exited with error code. See &quot;systemctl status docker.service&quot; and &quot;journalctl -xe&quot; for details.</p>
  </blockquote>
  <p>Output of command</p>
  <pre><code>**systemctl status docker.service**
  
  `● docker.service - Docker Application Container Engine
     Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
    Drop-In: /etc/systemd/system/docker.service.d
             └─docker.conf, http-proxy.conf, https-proxy.conf
     Active: failed (Result: exit-code) since Mon 2018-03-05 17:17:54 IST; 2min 23s ago
       Docs: https://docs.docker.com
    Process: 11331 ExecStart=/usr/bin/dockerd --graph=/app/dockerRT (code=exited, status=1/FAILURE)
   Main PID: 11331 (code=exited, status=1/FAILURE)
     Memory: 76.9M
     CGroup: /system.slice/docker.service
             └─4593 docker-containerd-shim 3bda33eac892d14adda9f3b1fc8dc52173e26ce60ca949075227d903399c7517 /var/run/docker/libcontainerd/3bda33eac892d14adda9f3b1fc8dc52173e26c...
  Mar 05 17:17:05 hj-fsbfsd9761.persistent.co.in systemd[1]: Starting Docker Application Container Engine...
  Mar 05 17:17:05 hj-fsbfsd9761.persistent.co.in dockerd[11331]: time=&quot;2018-03-05T17:17:05.126009059+05:30&quot; level=info msg=&quot;libcontainerd: new containerd process, pid: 11337&quot;
  Mar 05 17:17:06 hj-fsbfsd9761.persistent.co.in dockerd[11331]: time=&quot;2018-03-05T17:17:06.346599571+05:30&quot; level=warning msg=&quot;devmapper: Usage of loopback devices is ...section.&quot;
  Mar 05 17:17:10 hj-fsbfsd9761.persistent.co.in dockerd[11331]: time=&quot;2018-03-05T17:17:10.889378989+05:30&quot; level=warning msg=&quot;devmapper: Base device already exists an...ignored.&quot;
  Mar 05 17:17:10 hj-fsbfsd9761.persistent.co.in dockerd[11331]: time=&quot;2018-03-05T17:17:10.976695025+05:30&quot; level=info msg=&quot;[graphdriver] using prior storage driver \&quot;...mapper\&quot;&quot;
  Mar 05 17:17:54 hj-fsbfsd9761.persistent.co.in dockerd[11331]: time=&quot;2018-03-05T17:17:54.312812069+05:30&quot; level=fatal msg=&quot;Error starting daemon: timeout&quot;
  Mar 05 17:17:54 hj-fsbfsd9761.persistent.co.in systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
  Mar 05 17:17:54 hj-fsbfsd9761.persistent.co.in systemd[1]: **Failed to start Docker Application Container Engine.**
  Mar 05 17:17:54 hj-fsbfsd9761.persistent.co.in systemd[1]: Unit docker.service entered failed state.
  Mar 05 17:17:54 hj-fsbfsd9761.persistent.co.in systemd[1]: docker.service failed.
  Hint: Some lines were ellipsized, use -l to show in full.
  </code></pre>
  <blockquote>
  <p>journalctl -xe
  loop: Write error at byte offset 63585648640, length 4096.</p>
  </blockquote>
  <p>How would I be able to start Docker without losing any containers and using previous configurations?</p>