下载docker-ce的repo

curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

安装依赖（这是相比centos7的关键步骤）

yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm

安装docker-ce

yum install docker-ce

安装docker-ce报错

file /usr/share/man/man1/docker-volume.1.gz from install of docker-ce-cli-1:19.03.8-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch

解决方法：

yum  remove podman-manpages -y

启动docker

systemctl start docker