docker service startup error: sudo systemctl restart docker, prompt: Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details.
check the status fo the service: systemctl status docker.service

II. Problem-solving
1. Enter the docker directory: cd /etc/docker/
2. Modify the type of daemon: mv daemon.json daemon.conf
3. Restart docker: systemctl restart docker