centos8 安装docker

centos8安装docker的时候非常蛋疼，有一步需要自己去下载，特此记录一下

1. 下载docker-ce的repo
   curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo
2. 安装依赖
   yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm
3. 安装docker-ce
   yum install docker-ce
4. 启动docker
   systemctl start docker