最近发现某台机器上的Docker服务无法开启，报如下错误：

[root@localhost ~]# docker ps -aCannot connect to the Docker daemon. Is 'docker -d' running on this host?[root@localhost ~]# service docker restartRedirecting to /bin/systemctl restart  docker.serviceJob for docker.service failed. See 'systemctl status docker.service' and 'journalctl -xn' for details.

没找到对应的解决方法，只能进行重装了。以下附上Centos7下卸载docker的命令：

[root@localhost ~]# yum list installed | grep dockerRepodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fastdocker.x86_64                          1.7.1-108.el7.centos            @extras  docker-selinux.x86_64                  1.7.1-108.el7.centos            @extras  [root@localhost ~]# yum -y remove docker.x86_64[root@localhost ~]# yum -y remove docker-selinux.x86_64