重啟報錯：
[root@localhost ~]# systemctl restart docker Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
[root@localhost ~]# journalctl -xe -- The start-up result is done. 12月 19 10:27:58 localhost systemd[1]: Started Docker Storage Setup. -- Subject: Unit docker-storage-setup.service has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker-storage-setup.service has finished starting up. -- -- The start-up result is done. 12月 19 10:27:58 localhost 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. 12月 19 10:27:58 localhost dockerd-current[3480]: time="2018-12-19T10:27:58.101895626+08:00" level=warning 12月 19 10:27:58 localhost dockerd-current[3480]: time="2018-12-19T10:27:58.106879353+08:00" level=info msg 12月 19 10:27:59 localhost dockerd-current[3480]: Error starting daemon: SELinux is not supported with the 12月 19 10:27:59 localhost systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE 12月 19 10:27:59 localhost 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. 12月 19 10:27:59 localhost systemd[1]: Unit docker.service entered failed state. 12月 19 10:27:59 localhost systemd[1]: docker.service failed. 12月 19 10:27:59 localhost polkitd[896]: Unregistered Authentication Agent for unix-process:3420:114832 (sy
原因是：
這是由於overlay2不支持造成的，所以我們要關閉它。
解決方法：
vim /etc/sysconfig/docker (修改文件)
DNS='--selinux-enabled --log-driver=journald --signature-verification=false'
if [ -z "${DOCKER_CERT_PATH}" ]; then
DOCKER_CERT_PATH=/etc/docker
fi
重啟： systemctl restart docker