centos8.1安装docker

在使用centos8.1安装docker时相比centos7版本会遇到一些问题，所以记录下方便其他的同学。

Uninstall old versions

$ sudo yum remove docker 
                  docker-client 
                  docker-client-latest 
                  docker-common 
                  docker-latest 
                  docker-latest-logrotate 
                  docker-logrotate 
                  docker-engine

Install using the repository

$ sudo yum install -y yum-utils

$ sudo yum-config-manager 
    --add-repo 
    https://download.docker.com/linux/centos/docker-ce.repo

###安装docker-ce时会需要这个包，所以要先装好。
yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm

Install Docker Engine

$ sudo yum install docker-ce  -y
$ sudo systemctl start docker
$ sudo systemctl enbale docker
$ sudo docker run hello-world