搭建CentOS在线yum源镜像服务器
准备篇：
系统环境：
操作系统：CentOS6.x
IP地址：192.168.12.128（ip地址随意，DHCP还是静态的都行，只要能联网就行）
一、安装http服务器
这里使用Nginx服务器搭建，CentOS安装配置LNMP服务器参考：http://www.osyunwei.com/archives/5910.html
二、站点目录位置
# vi /usr/local/Nginx/conf/Nginx.conf #编辑配置文件，在http {下面添加以下内容：
autoindex on; #开启Nginx目录浏览功能
autoindex_exact_size off; #文件大小从KB开始显示
autoindex_localtime on; #显示文件修改时间为服务器本地时间
:wq! #保存，退出
# service Nginx reload #重新加载配置
参考：Nginx开启目录浏览功能: http://www.osyunwei.com/archives/5051.html
安装篇：
一、创建镜像文件存放位置
mkdir -p /usr/local/Nginx/html/centos #CentOS官方标准源
mkdir -p /usr/local/Nginx/html/repoforge #第三方rpmforge源
mkdir -p /usr/local/Nginx/html/epel #第三方epel源
说明：这里创建三个文件夹，分别存放CentOS官方标准源、第三方的rpmforge源和epel源
二、确定以上三个yum源上游源的同步镜像地址
CentOS官方标准源：rsync://mirrors.ustc.edu.cn/centos/
rpmforge源：rsync://mirrors.ispros.com.bd/repoforge/
epel源：rsync://mirrors.ustc.edu.cn/epel/
备注：上游yum源必须要支持rsync协议，否则不能使用rsync进行同步。
参考：
CentOS官方标准源：
rsync://mirrors.kernel.org/centos
rpmforge源：
rsync://ftp-stud.fht-esslingen.de/dag
epel源：
http://mirrors.fedoraproject.org/publiclist/EPEL/
rsync://mirrors.kernel.org/fedora-epel
三、创建以上三个yum源同步脚本，并且设定脚本自动执行
# mkdir -p /home/crontab #创建目录
# vi /home/crontab/yum_rsync.sh #添加以下代码
#!/bin/sh
/usr/bin/rsync -avrt rsync://mirrors.ustc.edu.cn/centos/ --exclude-from=/usr/local/Nginx/html/exclude_centos.list /usr/local/Nginx/html/centos/
/usr/bin/rsync -avrt rsync://mirrors.ispros.com.bd/repoforge/ --exclude-from=/usr/local/Nginx/html/exclude_repoforge.list /usr/local/Nginx/html/repoforge/
/usr/bin/rsync -avrt rsync://mirrors.ustc.edu.cn/epel/ --exclude-from=/usr/local/Nginx/html/exclude_epel.list /usr/local/Nginx/html/epel/
:wq! #保存退出
# chmod +x /home/crontab/yum_rsync.sh #添加脚本执行权限
备注：运行此脚本前，先要创建好同步目录及不需要同步的目录列表文件
# cd /usr/local/Nginx/html/ #进入目录
# touch exclude_centos.list #创建文件
# touch exclude_repoforge.list #创建文件
# touch exclude_epel.list #创建文件
把不需要同步的目录写到上面对应的文件中，每行一个目录,例如：
# vi exclude_epel.list
# 4/
# 4AS/
# 4ES/
# 4WS/
:wq! #保存退出
四、添加脚本定时执行任务
# vi /etc/crontab #在最后一行添加以下代码
0 1 * * * root /home/crontab/yum_rsync.sh #设置每天凌晨1点整开始执行脚本
:wq! #保存退出
# service crond restart #重启
测试篇：
一、安装rsync同步软件：
# yum install rsync xinetd #安装
# vi /etc/xinetd.d/rsync #编辑配置文件，设置开机启动rsync
disable = no #修改为
# /etc/init.d/xinetd start #启动（CentOS中是以xinetd 来管理Rsync服务的）
:wq! #保存退出
二、执行同步脚本
# sh /home/crontab/yum_rsync.sh
注意：等待脚本执行完毕，首次同步，耗费的时间比较长！
三、根据不同版本创建三个yum源的repo配置文件
# cd /etc/yum.repos.d/ #进入目录
# mv /etc/yum.repos.d/CentOS-Base.repo CentOS-Base.repo-bak
CentOS官方标准源：
1.CentOS 5.x系列：
# vi /etc/yum.repos.d/CentOS-Base.repo #添加以下代码
[base]
name=CentOS-$releasever - Base - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
#released updates
[updates]
name=CentOS-$releasever - Updates - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-5
:wq! #保存退出
2. CentOS 6.x系列：
# vi /etc/yum.repos.d/CentOS-Base.repo #添加以下代码
[base]
name=CentOS-$releasever - Base - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
:wq! #保存退出
3. CentOS 7.x系列：
# vi /etc/yum.repos.d/CentOS-Base.repo #添加以下代码
[base]
name=CentOS-$releasever - Base
baseurl=http://192.168.21.188/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://192.168.21.188/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://192.168.21.188/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
baseurl=http://192.168.21.188/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-7
:wq! #保存退出
备注：或者参考：https://lug.ustc.edu.cn/wiki/mirrors/help/centos
把里面的http://mirrors.ustc.edu.cn/替换为http://192.168.21.188/
rpmforge源：
1.CentOS 5.x系列：
# vi /etc/yum.repos.d/rpmforge.repo #添加以下代码
[rpmforge]
name = RHEL $releasever - RPMforge.net - dag
baseurl = http://192.168.21.188/repoforge/redhat/el5/en/$basearch/rpmforge
enabled = 1
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-extras]
name = RHEL $releasever - RPMforge.net - extras
baseurl = http://192.168.21.188/repoforge/redhat/el5/en/$basearch/extras
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-testing]
name = RHEL $releasever - RPMforge.net - testing
baseurl = http://192.168.21.188/repoforge/redhat/el5/en/$basearch/testing
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
:wq! #保存退出
2.CentOS 6.x系列：
# vi /etc/yum.repos.d/rpmforge.repo #添加以下代码
[rpmforge]
name = RHEL $releasever - RPMforge.net - dag
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/rpmforge
enabled = 1
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-extras]
name = RHEL $releasever - RPMforge.net - extras
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/extras
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-testing]
name = RHEL $releasever - RPMforge.net - testing
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/testing
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
:wq! #保存退出
3.CentOS 7.x系列：
# vi /etc/yum.repos.d/rpmforge.repo #添加以下代码
[rpmforge]
name = RHEL $releasever - RPMforge.net - dag
baseurl = http://192.168.21.188/repoforge/redhat/el7/en/$basearch/rpmforge
enabled = 1
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-extras]
name = RHEL $releasever - RPMforge.net - extras
baseurl = http://192.168.21.188/repoforge/redhat/el7/en/$basearch/extras
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-testing]
name = RHEL $releasever - RPMforge.net - testing
baseurl = http://192.168.21.188/repoforge/redhat/el7/en/$basearch/testing
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
:wq! #保存退出
epel源：
1.CentOS 5.x系列：
# vi /etc/yum.repos.d/epel.repo #添加以下代码
[epel]
name=Extra Packages for Enterprise Linux 5 - $basearch
baseurl=http://192.168.21.188/epel/5/$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-5
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 5 - $basearch - Debug
baseurl=http://192.168.21.188/epel/5/$basearch/debug
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-5
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 5 - $basearch - Source
baseurl=http://192.168.21.188/epel/5/SRPMS
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-5
gpgcheck=1
:wq! #保存退出
2.CentOS 6.x系列：
# vi /etc/yum.repos.d/epel.repo #添加以下代码
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://192.168.21.188/epel/6/$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 6 - $basearch - Debug
baseurl=http://192.168.21.188/epel/6/$basearch/debug
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 6 - $basearch - Source
baseurl=http://192.168.21.188/epel/6/SRPMS
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
gpgcheck=1
:wq! #保存退出
3.CentOS 7.x系列：
# vi /etc/yum.repos.d/epel.repo #添加以下代码
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://192.168.21.188/epel/beta/7/$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-7
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://192.168.21.188/epel/beta/7/$basearch/debug
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-7
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://192.168.21.188/epel/beta/7/SRPMS
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-7
gpgcheck=1
:wq! #保存退出
四、测试yum源是否配置正确
当前系统版本为CentOS 6.x，以此为例
1. 添加CentOS-Base.repo
# cd /etc/yum.repos.d/
# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[base]
name=CentOS-$releasever - Base - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - huanqiu.com
baseurl=http://192.168.21.188/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://192.168.21.188/centos/RPM-GPG-KEY-CentOS-6
:wq! #保存退出
2. 添加rpmforge.repo
[rpmforge]
name = RHEL $releasever - RPMforge.net - dag
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/rpmforge
enabled = 1
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-extras]
name = RHEL $releasever - RPMforge.net - extras
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/extras
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
[rpmforge-testing]
name = RHEL $releasever - RPMforge.net - testing
baseurl = http://192.168.21.188/repoforge/redhat/el6/en/$basearch/testing
enabled = 0
protect = 0
gpgkey=http://192.168.21.188/repoforge/RPM-GPG-KEY-rpmforge
gpgcheck = 1
:wq! #保存退出
3. 添加epel.repo
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://192.168.21.188/epel/6/$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
[epel-debuginfo]
name=Extra Packages for Enterprise Linux 6 - $basearch - Debug
baseurl=http://192.168.21.188/epel/6/$basearch/debug
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
gpgcheck=1
[epel-source]
name=Extra Packages for Enterprise Linux 6 - $basearch - Source
baseurl=http://192.168.21.188/epel/6/SRPMS
failovermethod=priority
enabled=0
gpgkey =http://192.168.21.188/epel/RPM-GPG-KEY-EPEL-6
gpgcheck=1
wq! #保存退出
4. 清除缓存，列出可用源软件包
# yum clean all #清除当前yum缓存
# yum makecache #缓存yum源中的软件包信息
# yum repolist #列出yum源中可用的软件包
5. 使用yum命令安装软件
# yum install PHP #测试CentOS官方标准源
# yum install htop #测试rpmforge源
# yum install Nginx #测试epel源
至此，搭建CentOS在线yum源镜像服务器完成
此教程参考: http://www.centoscn.com/CentosServer/test/2014/0904/3675.html
也是可以将同步下来的yum源制作成ISO镜像的，这个我制作了epel源的iso，大家有兴趣可以试下，方法网上找下吧，我这当初做忘了整理文档了。
