系统：centos7
一、安装nginx
yum install -y nginx
yum install -y createrepo 安装建yum源仓库的工具，可以用来建立yum仓库
yum install -y yum-plugin-priorities 安装控制yum源更新优先级工具，这个工具可以用来控制进行yum源检索的先后顺序，建议可以用在client端。
二、配置nginx
/etc/nginx/nginx.conf
server{ listen 80; autoindex on; autoindex_exact_size on; autoindex_localtime on; }
默认index路径/usr/share/nginx/html
那么在html下面建立以下目录：
mkdir -p /usr/share/nginx/html/CentOS-YUM/CentOS/version_6.6/64bit/ mkdir -p /usr/share/nginx/html/CentOS-YUM/CentOS/version_7.0/64bit/ mkdir -p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_6.6/64bit/ mkdir -p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_7.0/64bit/
且不要忘记给目录增加可读和可执行权限，否则在web页面显示不出来。
chmod -R +x /usr/share/nginx/html/
在web的index.html首页里面添加指向文件目录的超链接：
<p style="font-weight:bolder;color:green;font-size:30px;">ALL of the packages in the below:</p>
<br/>
<a href="http://159.138.1.77/CentOS-YUM/Aliyun">Aliyun</a><br/>
These packagers from of CentOS ISO.<br/>
<a href="http://159.138.1.77/CentOS-YUM/CentOS">CentOS</a><br/>
These packagers from of "Internet service provider".<br/>
<p style="font-weight:bolder;color:red;font-size:18px;">Please replace the file and fill in the following content:</p>
<p style="font-weight:bolder;color:blue;font-size:15px;">Way: /etc/yum.repos.d/CentOS-Base.repo</p>
重启nginx
systemctl restart nginx
三、修改当前系统yum来源repo文件
1.首先对此文件进行备份
cp -p /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
2.接下来去阿里云的官方网站下载阿里云的CentOS-Base.repo文件,如下所示：
mkdir -p /etc/yum.repos.d/Aliyun
wget -O /etc/yum.repos.d/Aliyun/CentOS-6.repo http://mirrors.aliyun.com/repo/Centos-6.repo wget -O /etc/yum.repos.d/Aliyun/CentOS-7.repo http://mirrors.aliyun.com/repo/Centos-7.repo
四、进行同步脚本的创建并执行同步
vim /etc/yum.repos.d/yum.reposync.sh
#!bin/bash reposync -p /usr/share/nginx/html/CentOS-YUM/CentOS/version_7.0/64bit/ /usr/bin/sed -i "s/7/6/g" `grep 7 -rl /etc/yum.repos.d/CentOS-Base.repo` reposync –p /usr/share/nginx/html/CentOS-YUM/CentOS/version_6.6/64bit/ cat /etc/yum.repos.d/Aliyun/CentOS-6.repo > /etc/yum.repos.d/CentOS-Base.repo reposync –p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_6.6/64bit/ /usr/bin/sed -i "s/6/7/g" `grep 6 -rl /etc/yum.repos.d/CentOS-Base.repo` reposync –p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_7.0/64bit/ cat /etc/yum.repos.d/CentOS-Base.repo.bak > /etc/yum.repos.d/CentOS-Base.repo
chmod +x /etc/yum.repos.d/yum.reposync.sh
然后执行脚本
sh yum.reposync.sh
原文：https://www.cnblogs.com/kevincaptain/p/10348437.html