一.搭建在线yum源的优势

1.架设自己的yum源，节省带宽
2.避免通过网络访问延迟
3.对于有联网限制的服务器
二.搭建步骤
1.安装Nginx

yum install Nginx -y@H_403_11@
修改配置文件
vim /usr/local@H_403_11@/Nginx/conf/Nginx.conf
server {
        listen@H_403_11@       80@H_403_11@;
        server_name  localhost;

        #charset koi8-r;@H_403_11@

        #access_log logs/host.access.log main;@H_403_11@

        location / {
            root   /rpm;
            index@H_403_11@  index@H_403_11@.html index@H_403_11@.htm;
            autoindex on;
        }

/usr/local@H_403_11@/Nginx/sbin/Nginx   ##启动Nginx@H_403_11@

2.搭建国内yum源
（1）备份原始yum源

mv /etc/yum.repos@H_403_11@.d@H_403_11@/CentOS-Base.repo@H_403_11@ /etc/yum.repos@H_403_11@.d@H_403_11@/CentOS-Base.repo@H_403_11@.backup@H_403_11@
wget -O /etc/yum.repos@H_403_11@.d@H_403_11@/CentOS-Base.repo@H_403_11@ http://mirrors.aliyun@H_403_11@.com@H_403_11@/repo/Centos-6.@H_403_11@repo
yum clear all
yum repolist

3.同步网络yum源
（1）创建目录

mkdir@H_403_11@ /rpm

（2）安装工具包

yum -y install yum-utils
 cd@H_403_11@ /rpm
 reposync -r base   ##缓存网络源到本地@H_403_11@

（3）扫描yum源配置目录

createrepo  base@H_403_11@/Packages/

至此本地yum源搭建成功

三 . 测试
（1）备份自带yum 源

mv /etc/yum.repos@H_403_11@.d@H_403_11@/CentOS-Base.repo@H_403_11@ /etc/yum.repos@H_403_11@.d@H_403_11@/CentOS-Base.repo@H_403_11@.backup@H_403_11@

（2）配置yum源