卸载老版本的 docker 及其相关依赖
sudo yum remove docker docker-common container-selinux docker-selinux docker-engine
更新yum
yum update -y
安装 yum-utils，它提供了 yum-config-manager，可用来管理yum源
sudo yum install -y yum-utils
添加yum源
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
更新索引
centos7
sudo yum makecache fast
centos8
sudo yum makecache
安装 docker-ce
centos8 需要先安装依赖包，centos7可直接跳过下面两步直接安装docker-ce
wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
yum -y install containerd.io-1.2.6-3.3.el7.x86_64.rpm
sudo yum install -y docker-ce
启动 docker
sudo systemctl start docker