docker默认安装目录：/var/lib/docker

1.删除老docker

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

2.备份原yum源

cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo_bak

3.获取阿里云yum源

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

4.清除原有yum源缓存

yum clean all

5.生成阿里云yum源缓存

yum makecache

6.安装 yum-utils，用来管理yum源

yum install -y yum-utils

7.添加阿里云docker的yum源

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

8.更新yum索引

yum makecache fast

9.安装最新版docker

yum list docker-ce --showduplicates | sort -r

10.安装最新 docker-ce

yum install -y docker-ce

11.启动 docker

systemctl start docker

12.关闭docker

systemctl stop docker

13.重启docker

systemctl restart  docker

14.开机自启设置

systemctl enable docker

15.删除开机自启设置

systemctl disable name.service