错误描述

启动docker服务的时候报错：Failed to start docker.service: Unit docker.service is masked.

解决方案

依次输入

sudo systemctl unmask docker
sudo systemctl start docker

可能遇到的问题

$ sudo systemctl start docker
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xe" for details.

输入提示的命令

sudo systemctl status docker.service
journalctl -xe

再次输入

sudo systemctl start docker

最后就能用service指令启动docker了~