title: Job for docker.service failed because the control process exited with error code
body: <p>So I installed docker engine on RHEL 7 </p>
  
  <p>Now when I do a </p>
  
  <pre><code>service docker start
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
  </code></pre>
  
  <p>and when I go to "systemctl status docker.service" and "journalctl -xe"
  I get:</p>
  
  <pre><code>docker.service - Docker Application Container Engine
     Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
    Drop-In: /etc/systemd/system/docker.service.d
             └─docker.conf
     Active: failed (Result: exit-code) since Thu 2016-09-08 22:15:53 EDT; 10s ago
       Docs: https://docs.docker.com
    Process: 13504 ExecStart=/usr/bin/docker daemon -H fd:// --mtu 1400 --exec-opt native.cgroupdriver=systemd (code=exited, status=1/FAILURE)
   Main PID: 13504 (code=exited, status=1/FAILURE)
  
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Starting Docker Application Container Engine...
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com docker[13504]: time="2016-09-08T22:15:53.227074798-04:00" level=fatal msg="no sockets found via socket activation: make sure the service ...by systemd"
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Failed to start Docker Application Container Engine.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Unit docker.service entered failed state.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service failed.
  </code></pre>
  
  <p>And </p>
  
  <p>--</p>
  
  <pre><code>-- The start-up result is done.
  Sep 08 22:10:01 app-linux2.app-netapp.lab.com CROND[12753]: (root) CMD (/usr/lib64/sa/sa1 1 1)
  Sep 08 22:10:01 app-linux2.app-netapp.lab.com systemd[1]: Starting Session 58 of user root.
  -- Subject: Unit session-58.scope has begun start-up
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit session-58.scope has begun starting up.
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com polkitd[766]: Registered Authentication Agent for unix-process:12878:2674931 (system bus name :1.173 [/usr/bin/pkttyagent --notify-fd 5 --fallback], ob
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com systemd[1]: Starting Docker Application Container Engine...
  -- Subject: Unit docker.service has begun start-up
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit docker.service has begun starting up.
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com docker[12895]: time="2016-09-08T22:10:53.413304246-04:00" level=fatal msg="no sockets found via socket activation: make sure the service was started by
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com systemd[1]: Failed to start Docker Application Container Engine.
  -- Subject: Unit docker.service has failed
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit docker.service has failed.
  --
  -- The result is failed.
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com systemd[1]: Unit docker.service entered failed state.
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service failed.
  Sep 08 22:10:53 app-linux2.app-netapp.lab.com polkitd[766]: Unregistered Authentication Agent for unix-process:12878:2674931 (system bus name :1.173, object path /org/freedesktop/PolicyKit1/Authent
  Sep 08 22:13:36 app-linux2.app-netapp.lab.com polkitd[766]: Registered Authentication Agent for unix-process:13214:2691210 (system bus name :1.174 [/usr/bin/pkttyagent --notify-fd 5 --fallback], ob
  Sep 08 22:13:36 app-linux2.app-netapp.lab.com polkitd[766]: Unregistered Authentication Agent for unix-process:13214:2691210 (system bus name :1.174, object path /org/freedesktop/PolicyKit1/Authent
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com polkitd[766]: Registered Authentication Agent for unix-process:13489:2704913 (system bus name :1.175 [/usr/bin/pkttyagent --notify-fd 5 --fallback], ob
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Starting Docker Application Container Engine...
  -- Subject: Unit docker.service has begun start-up
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit docker.service has begun starting up.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com docker[13504]: time="2016-09-08T22:15:53.227074798-04:00" level=fatal msg="no sockets found via socket activation: make sure the service was started by
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Failed to start Docker Application Container Engine.
  -- Subject: Unit docker.service has failed
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit docker.service has failed.
  --
  -- The result is failed.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: Unit docker.service entered failed state.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com systemd[1]: docker.service failed.
  Sep 08 22:15:53 app-linux2.app-netapp.lab.com polkitd[766]: Unregistered Authentication Agent for unix-process:13489:2704913 (system bus name :1.175, object path /org/freedesktop/PolicyKit1/Authent
  lines 3473-3523/3523 (END)
  </code></pre>
  
  <p>I tried to search solution for this 
  but could not find any.</p>