http://blog.m6699.com/diomedea/article/29966.html
大家都知道rhel想要跟新軟件都是要注冊的，對于平民百姓來說那費用還是有點高的。呵呵，看了網上的資料寫的都是雜亂無章的，今天剛好有時間，整理下我的redhat as5.3 的yum配置，希望對大家有所幫助
配置rhel 5 使用CentOS的yum站點升級
刪除原來的/etc/yum.conf文件和/etc/yum.repo.d目錄
rm -rf /etc/yum.conf
cd /etc/yum.repos.d/
rm -rf rhel-debuginfo.repo
vi /etc/yum.conf
[main]
cachedir=/var/cache/yum
keepcache=1
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
metadata_expire=1800
# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
[base]
name=centos-5 - Base
baseurl=http://centos.ustc.edu.cn/centos/5/os/i386/
# the other site: http://centos.candishosting.com.cn/centos/5/os/i386/
# you can find more site in: http://www.centos.org/modules/tinycontent/index.php?id=13
enabled=1
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
#released updates
[update]
name=CentOS-5 - Updates
baseurl=http://mirror.centos.org/centos/5/updates/i386/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
baseurl=http://mirror.centos.org/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
baseurl=http://mirror.centos.org/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
baseurl=http://mirror.centos.org/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
baseurl=http://mirror.centos.org/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
#packages in testing
[testing]
name=CentOS-5 - Testing
baseurl=http://mirror.centos.org/centos/5/testing/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5
到此就ok了 ，是不是很方便！！！，這個是中科大的源，號稱每隔小時跟新一次，速度確實蠻快
測試下
yum -y install system-config-date