一、安装wget
方式1：yum install wget（我的虚拟机安装后无法下载,故采用方式2）
方式2: 下载wget的rpm包：
rpm -ivh wget-1.14-15.el7_4.1.x86_64.rpm
二、修改yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
--2020-06-07 09:07:02-- http://mirrors.aliyun.com/repo/Centos-7.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 120.241.46.238, 120.241.46.243, 120.241.46.241, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|120.241.46.238|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2523 (2.5K) [application/octet-stream]
正在保存至: “/etc/yum.repos.d/CentOS-Base.repo”
100%[===================================================================================================================================>] 2,523 --.-K/s 用时 0.001s
2020-06-07 09:07:02 (2.54 MB/s) - 已保存 “/etc/yum.repos.d/CentOS-Base.repo” [2523/2523])
2.1 清理缓存，生成新缓存
yum clean all
yum makecache
三、安装docker
yum install -y docker
设置 docker 开机自动启动
systemctl start docker # 启动 docker 服务端
systemctl enable docker # 启用 docker 服务开机自启
查看docker 版本
[root@localhost ~]# docker version
Client:
Version: 1.13.1
API version: 1.26
Package version: docker-1.13.1-161.git64e9980.el7_8.x86_64
Go version: go1.10.3
Git commit: 64e9980/1.13.1
Built: Tue Apr 28 14:43:01 2020
OS/Arch: linux/amd64
Server:
Version: 1.13.1
API version: 1.26 (minimum version 1.12)
Package version: docker-1.13.1-161.git64e9980.el7_8.x86_64
Go version: go1.10.3
Git commit: 64e9980/1.13.1
Built: Tue Apr 28 14:43:01 2020
OS/Arch: linux/amd64
Experimental: false
四 修改docker 源, 真香操作，建议必须改
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://zc0n33d2.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker