CentOS7 failed to start docker.service

  docker, question

A dependency job for docker.service failed. See ‘journalctl -xe’ for details.

Job docker.service/start failed with result ‘dependency Unit containerd.service entered failed state.containerd.service failed.

Dependency failed for Docker Application Container Engine

[root@cb ~]# systemctl start docker.service
 A dependency job for docker.service failed. See 'journalctl -xe' for details.
 [root@cb ~]# journalctl -xe
 -- 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 dependency.
 Nov 20 04:40:37 cb systemd[1]: Job  docker.service/start failed with result 'dependency
 Nov 20 04:40:37 cb systemd[1]: Unit containerd.service entered failed state.
 Nov 20 04:40:37 cb systemd[1]: containerd.service failed.
 Nov 20 04:40:37 cb systemd[1]: Stopped Docker Application Container Engine.
 -- Subject: Unit docker.service has finished shutting down
 -- Defined-By: systemd
 -- Support:  http://lists.freedesktop.org/mailman/listinfo/systemd-devel
 --
 -- Unit docker.service has finished shutting down.
 [root@cb ~]# systemctl status docker -l
 * docker.service - Docker Application Container Engine
 Loaded: loaded (/usr/lib/systemd/system/docker.service;   disabled;  vendor preset: disabled)
 Active: inactive (dead)
 Docs:  https://docs.docker.com
 
 Nov 20 04:37:11 cb systemd[1]: Job  docker.service/start failed with result 'dependency'.
 Nov 20 04:37:11 cb systemd[1]: Stopped Docker Application Container Engine.
 Nov 20 04:37:45 cb systemd[1]: Starting Docker Application Container Engine  ...
 Nov 20 04:37:45 cb systemd[1]: Dependency failed for Docker Application Container Engine.
 Nov 20 04:37:45 cb systemd[1]: Job  docker.service/start failed with result 'dependency'.
 Nov 20 04:37:45 cb systemd[1]: Stopped Docker Application Container Engine.
 Nov 20 04:40:37 cb systemd[1]: Starting Docker Application Container Engine  ...
 Nov 20 04:40:37 cb systemd[1]: Dependency failed for Docker Application Container Engine.
 Nov 20 04:40:37 cb systemd[1]: Job  docker.service/start failed with result 'dependency'.
 Nov 20 04:40:37 cb systemd[1]: Stopped Docker Application Container Engine.

Post your/usr/lib/systemd/system/doc.service.

Is there a value for the Afrer attribute under [Unit]