To force a start use “systemctl reset-failed docker.service“ followed by “systemctl start docker.ser

centos7上的docker启动失败，报错如下：

Job for docker.service failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details.
To force a start use "systemctl reset-failed docker.service" followed by "systemctl start docker.service" again.

使用 vim /etc/docker/daemon.json 命令，在配置文件中新增如下内容：

{"storage-driver":"devicemapper"}

下面是我的配置文件，贴出来供参考，第一行是镜像加速代理地址。

{"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"],"storage-driver":"devicemapper"
}

编辑保存之后，重载配置文件，重新启动docker服务即可。

systemctl daemon-reload
systemctl restart docker

启动成功之后使用systemctl status docker命令查看状态，启动成功，问题解决。