安装docker

1/ 卸载旧版本的docker

$ sudo yum remove docker\

docker-client\

docker-client-latest\

docker-common\

docker-latest\

docker-latest-logrotate\

docker-logrotate\

docker-selinux\

docker-engine-selinux\

docker-engine

2/安装步骤

$ sudo yum install -y yum-utils\

device-mapper-persistent-data\

lvm2

$ sudo yum-config-manager\

--add-repo\

http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

$ sudo yum install docker-ce

$ sudo systemctl start docker

$ sudo docker run hello-world

参考文档：docker官网