docker安装

1)Uninstall old versions

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

2)SET UP THE REPOSITORY

2.1)Install required packages

yum install -y yum-utils 
device-mapper-persistent-data 
lvm2

2.2)set up the stable repository.

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

3)INSTALL DOCKER ENGINE - COMMUNITY

yum install docker-ce docker-ce-cli containerd.io

4)Start Docker

systemctl start docker

5)enable docker

systemctl enable docker

参考官方文档：https://docs.docker.com/install/linux/docker-ce/centos/