镜像同步公网yum源上游yum源必须要支持rsync协议，否则不能使用rsync进行同步。
centos源：rsync://rsync.mirrors.ustc.edu.cn/centos/
epel源：rsync://rsync.mirrors.ustc.edu.cn/epel/
同步命令：
# rsync -vrt --bwlimit=3000 --exclude=debug/ rsync://rsync.mirrors.ustc.edu.cn/epel/7/x86_64/ /data/mirrors/centos/epel7/x86_64/
_______________________________________________________________
| University of Science and Technology of China |
| Open Source Mirror (mirrors.ustc.edu.cn) |
|===============================================================|
| |
| Debian primary mirror in China mainland (ftp.cn.debian.org), |
| also mirroring a great many OSS projects & Linux distros. |
| |
| Currently we don't limit speed. To prevent overload, Each IP |
| is only allowed to start upto 2 concurrent rsync connections. |
| |
| This site also provides http/https/ftp access. |
| |
| Supported by USTC Network Information Center |
| and USTC Linux User Group (http://lug.ustc.edu.cn/). |
| |
| Sync Status: https://mirrors.ustc.edu.cn/status/ |
| News: https://servers.ustclug.org/ |
| Contact: lug@ustc.edu.cn |
| |
|_______________________________________________________________|
receiving incremental file list
./
x86_64/
x86_64/0/
x86_64/0/0ad-0.0.22-1.el7.x86_64.rpm
x86_64/0/0ad-data-0.0.22-1.el7.noarch.rpm
...
# rsync -vrt rsync://mirrors.ustc.edu.cn/centos/7/os/x86_64/ /data/mirrors/centos/7/os/x86_64/
# rsync -vrt rsync://mirrors.ustc.edu.cn/centos/7/extras/x86_64/ /data/mirrors/centos/7/extras/x86_64/
# rsync -vrt rsync://mirrors.ustc.edu.cn/centos/7/updates/x86_64/ /data/mirrors/centos/7/updates/x86_64/
# rsync -vrt --bwlimit=20000 rsync://rsync.mirrors.ustc.edu.cn/centos/6.9/ /data/mirrors/centos/6.9/
# rsync -vrt --bwlimit=20000 --exclude=debug/ rsync://rsync.mirrors.ustc.edu.cn/epel/6/x86_64/ /data/mirrors/centos/epel6/x86_64/
配置apache发布镜像目录，当然也可以用nginx或者其他web服务器。
# vim /etc/httpd/conf/httpd.conf
# 注释掉这一段
# <Directory />
# AllowOverride none
# Require all denied
# </Directory>
# 添加这一段
Alias /centos "/data/mirrors/centos/"
<Directory "/data/mirrors/centos">
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
# /etc/init.d/httpd reload
最后，配置repo就可以使用了。
[base]
name=CentOS-$releasever - Base
baseurl=http://10.100.10.89/centos/$releasever/os/$basearch/
enable=1
gpgcheck=0
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://10.100.10.89/centos/$releasever/updates/$basearch/
enable=1
gpgcheck=0
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://10.100.10.89/centos/$releasever/extras/$basearch/
enable=1
gpgcheck=0
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://10.100.10.89/centos/epel/7/$basearch
enabled=1
gpgcheck=0