redhat换yum源 根据redhat操作系统版本及位数，下载对应centos的版本及位数的这些包：yum-3.2.22-40.el5.centos.noarch.rpmyum-fastestmirror-1.1.16-21.el5.centos.noarch.rpmyum-metadata-parser-1.1.2-4.el5.x86_64.rpm1.先安装yum-metadata-parser-1.1.2-4.el5.x86_64.rpm：rpm -ivhyum-metadata-parser-1.1.2-4.el5.x86_64.rpm2.同时安装yum-3.2.22-40.el5.centos.noarch.rpm、yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpmrpm -ivhyum-3.2.22-40.el5.centos.noarch.rpmyum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm3.获取163yum:wgethttp://mirrors.163.com/.help/CentOS-Base-163.repo文件内容替换：把CentOS-Base-163.repo文件中的“$releasever”，替换成“5”(5为系统的版本号。) vi CentOS-Base-163.repo :% s/\$releasever/5/g[base]
name=CentOS-$releasever-Base
baseurl=http://mirrors.163.com/centos/6.3/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
#releasedupdates
[updates]
name=CentOS-$releasever-Updates
baseurl=http://mirrors.163.com/centos/6.3/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
#packagesused/PRoducedinthebuildbutnotreleased
#[addons]
#name=CentOS-$releasever-Addons
#baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/
#gpgcheck=1
#gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
#additionalpackagesthatmaybeuseful
[extras]
name=CentOS-$releasever-Extras
baseurl=http://mirrors.163.com/centos/6.3/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
#additionalpackagesthatextendfunctionalityofexistingpackages
[centosplus]
name=CentOS-$releasever-Plus
baseurl=http://mirrors.163.com/centos/6.3/centosplus/$basearch/
gpgcheck=1
enabled=0