1、yum源的下载地址默认是国外的网站，全部要替换成阿里云代理镜像才能丝滑使用

vim /etc/yum.repos.d/CentOS-Base.repo

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7


yum配置修改更新生效

yum clean all

yum makecache


2、删除docker的依赖冲突
sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine
3、安装相关的命令集
sudo yum install -y yum-utils


4、安装docker相关的yum源
sudo yum-config-manager  --add-repo  http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo    

5、安装docker
sudo yum install docker-ce docker-ce-cli containerd.io


6、docker镜像的下载地址也要替换，默认配的是外网，无法正常拉取
配置信息可以登录自己阿里云官网查询镜像加速器

阿里云容器都没法拉取了，国内某些限制真是多（很无语的），只能用一些教育网的源来做代替

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
    "registry-mirrors": [
        "https://do.nark.eu.org",
        "https://dc.j8.work",
        "https://docker.m.daocloud.io",
        "https://dockerproxy.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://docker.nju.edu.cn"
    ]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker


7、启动docker
sudo systemctl start docker
sudo systemctl enable docker

8、跑一个docker的简单镜像示例
sudo docker run hello-world