systemctl status docker.service
* docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: inactive (dead) (Result: exit-code) since Mon 2017-10-23 01:29:51 UTC; 6min ago
     Docs: https://docs.docker.com
  Process: 4268 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=1/FAILURE)
 Main PID: 4268 (code=exited, status=1/FAILURE)

Oct 23 01:29:51 vps136 systemd[1]: Failed to start Docker Application Container Engine.
Oct 23 01:29:51 vps136 systemd[1]: docker.service: Unit entered failed state.
Oct 23 01:29:51 vps136 systemd[1]: docker.service: Failed with result 'exit-code'.
Oct 23 01:29:51 vps136 systemd[1]: docker.service: Service hold-off time over, scheduling restart.
Oct 23 01:29:51 vps136 systemd[1]: Stopped Docker Application Container Engine.
Oct 23 01:29:51 vps136 systemd[1]: docker.service: Start request repeated too quickly.
Oct 23 01:29:51 vps136 systemd[1]: Failed to start Docker Application Container Engine.