安装必要工具集
sudo yum install -y yum-utils
安装Docker官方源
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
更新yum缓存
sudo yum makecache fast
安装Dcoker
sudo yum -y install docker-ce
启动Docker
sudo systemctl start docker
测试Docker
sudo docker run hello-world