卸载旧版本
> rpm -qa | grep docker # 也可以使用 yum list installed | grep docker
docker-engine-1.13.0-1.el7.centos.x86_64
docker-engine-selinux-1.13.0-1.el7.centos.noarch
> yum remove docker-engine-1.13.0-1.el7.centos.x86_64
> yum remove docker-engine-selinux-1.13.0-1.el7.centos.noarch
升级新版本
curl -fsSL https://get.docker.com/ | sh
重启docker
> systemctl restart docker # centos 7
> service docker restart # centos 6
> docker version # docker -v