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 /etc/yum.repos.d/yum.reposync.sh
createrepo -p /usr/share/nginx/html/CentOS-YUM/CentOS/version_6.6/64bit/base/Packages createrepo -p /usr/share/nginx/html/CentOS-YUM/CentOS/version_7.0/64bit/base/Packages createrepo -p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_6.6/64bit/base/Packages createrepo -p /usr/share/nginx/html/CentOS-YUM/Aliyun/version_7.0/64bit/base/Packages
当yum源仓库建立好以后，会在对应的目录下面出现“repodata”的目录。如下图所示：
五、客户端Client的yum配置：
1、安装优先级软件：
yum install -y yum-plugin-priorities
2.首先对client端的/etc/yum.repos.d/目录下的repo文件进行更改。
mkdir –p /etc/yum.repos.d/back mv /etc/yum.repos.d/* /etc/yum.repos.d/back/ vim /etc/yum.repos.d/CentOS-Base.repo
[mylocal] name=source_from_localserver #这里是整合到server端的centos6的光盘镜像yum源 baseurl=http://http://159.138.1.77/centos/6.6/x86_64/Packagers/ gpgcheck=0 enable=1 priority=1 #这里的priority就是上面安装的优先级工具，设定从小到大 [Aliyun_6.6_base] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/Aliyun/version_6.6/64bit/base/Packages gpgcheck=0 enable=1 priority=2 [Centos_6.6_base] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/CentOS/version_6.6/64bit/base/Packages gpgcheck=0 enable=1 priority=3 [Aliyun_6.6_extras] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/Aliyun/version_6.6/64bit/extras/Packages gpgcheck=0 enable=1 priority=4 [Centos_6.6_extras] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/CentOS/version_6.6/64bit/extras/Packages gpgcheck=0 enable=1 priority=5 [Aliyun_6.6_updates] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/Aliyun/version_6.6/64bit/updates/Packages gpgcheck=0 enable=1 priority=6 [Centos_6.6_updates] name=source_from_localserver baseurl=http://159.138.1.77/CentOS-YUM/CentOS/version_6.6/64bit/updates/Packages gpgcheck=0 enable=1 priority=7 ---------------------
3.然后进行本利的缓存的清理和建立
yum clean all
yum makecache
yum repolist
当缓存建立好以后，就可以在client端直接使用yum进行安装软件包了。而检索的顺序就是根据优先级来的。
六、配置server端的yum源自动更新机制
1.首先来写一个bash脚本在/home/crontab/下，这个脚本的作用说白了就是通过一条一条自动执行，最终达到，自动更新yum源的目的，代码如下：
vim /home/crontab/oderforrepo.sh
#!bin/bash /usr/bin/reposync -np /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` /usr/bin/reposync -np /usr/share/nginx/html/CentOS-YUM/CentOS/version_6.6/64bit/ cat /etc/yum.repos.d/CentOS-Base.aliyun.repo.bak > /etc/yum.repos.d/CentOS-Base.repo /usr/bin/reposync -np /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` /usr/bin/reposync -np /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
“-np”的意思为仅仅更新新更新的软件到指定目录
其他的跟第四步的语句是一个意思。
2、然后再来添加定时计划：
vim /etc/crontab 0 2 * * 6 rootrun-parts /home/crontab/oderforrepo.sh
这个定时任务表示：每周6的晚上凌晨2点开始执行oderforrepo.sh的脚本.
这样就可以自动更新yum源了。
最后记得查看本地系统的系统时间，如果觉得有必要可以将时间同步。
参考：https://blog.csdn.net/u012402276/article/details/53158682