配置Redhat Enterprise Linux 5.3使用CentOS的更新源
RHEL系列是使用最广的Linux服务器系统之一，但是对于未付费用户，却无法通过Redhat网络安装和更新软件，这不能不说是一个遗憾。其实我们完全可以通过RHEL的同胞兄弟CentOS的源来更新，步骤如下：1、在 /etc/yum.repos.d/ 目录下新建一个文件 CentOS-Base.repo
#vi CentOS-Base.repo
2、在该文件中录入以下内容并保存（本例的源在撰写本文时是有效的）：
name=CentOS-5 – Base#mirrorlist=http://mirrorlist.centos.org/?release=$releasever5&arch=$basearch&repo=os#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/baseurl=http://ftp.sjtu.edu.cn/centos/5/os/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#released updatesname=CentOS-5 – Updates#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=updatesbaseurl=http://ftp.sjtu.edu.cn/centos/5/updates/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#packages used/produced in the build but not releasedname=CentOS-5 – Addons#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=addonsbaseurl=http://ftp.sjtu.edu.cn/centos/5/addons/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#additional packages that may be usefulname=CentOS-5 – Extras#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=extrasbaseurl=http://ftp.sjtu.edu.cn/centos/5/extras/$basearch/gpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#additional packages that extend functionality of existing packagesname=CentOS-5 – Plus#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=centosplusbaseurl=http://ftp.sjtu.edu.cn/centos/5/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5#contrib – packages by Centos Usersname=CentOS-5 – Contrib#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=contribbaseurl=http://ftp.sjtu.edu.cn/centos/5/contrib/$basearch/gpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 3、执行更新：
# yum update
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另外，如果服务器需要通过代理上网，则需要设置一下代理服务器才能进行联网更新：
在 /etc/yum.conf文件加入下面一行内容，指定一下代理服务器参数：
#Set http proxy
proxy=http://192.168.1.100:8000
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