1、安装环境：
•系统：CentOS Linux release 7.6.1810 (Core)
•Docker版本：18.09.8
2、下载离线安装包
docker安装包下载：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-18.09.8-3.el7.x86_64.rpm
依赖包下载：
containerd.io：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.2-3.el7.x86_64.rpm
docker-ce-cli：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-cli-18.09.8-3.el7.x86_64.rpm
container-selinux：https://pkgs.org/download/container-selinux
3、安装
rpm -ivh docker-ce-cli-18.09.8-3.el7.x86_64.rpm
rpm -ivh container-selinux-2.107-3.el7.noarch.rpm
rpm -ivh containerd.io-1.2.2-3.el7.x86_64.rpm
rpm -ivh docker-ce-18.09.8-3.el7.x86_64.rpm
4、启动
# 查看状态
systemctl status docker
#启动
systemctl start docker
#加入开机自启
systemctl enable docker