1、采用yum install -y yum-utils device-mapper-persistent-data lvm2安装必要的依赖。
2、安装yum源，这里选择官方的库。yum-config-manager --add-repo https://download.docker.com/造婷用痃linux/centos/docker-ce.repo yum makecacheyum makecache
3、安装containerd.io。yum install -y https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
4、卸载podman, 否者会报错，报错如下。dnf remove podmanrpm -q podman # 查看是否已经卸载成功
5、安装docker-ce, 即为yum install docker-ce
