对于redhat版本的系统来说如果想使用yum的在线安装功能是需要花钱的，作为IT屌丝如何可以免费使用yum呢？答案是可以借助于centos系统开源包来给我们的yum工具做相应配置就可以使用。


1、删除redhat原有的yum源 
rpm -aq | grep yum|xargs rpm -e --nodeps 
2、下载新的yum安装包  ，这里我们使用CentOS的yum源 
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm 
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-3.2.29-69.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
3、安装yum软件包 
rpm -ivh  python-iniparse-0.3.1-2.1.el6.noarch.rpm 
rpm -ivh  yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
rpm -ivh  yum-3.2.29-69.el6.centos.noarch.rpm  yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
注意：最后两个安装包要放在一起同时安装，否则会提示相互依赖，安装失败。
4、更改yum源  #我们使用网易的CentOS镜像源 
cd /etc/yum.repos.d/ 
wget  http://mirrors.163.com/.help/CentOS6-Base-163.repo 
vi CentOS6-Base-163.repo 
编辑文件，把文件里面的$releasever全部替换为版本号，即6 最后保存，或者直接用复制下面的CentOS6-Base-163.repo 
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-6 - Base - 163.com
baseurl=http://mirror.centos.org/centos/6/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#released updates 
[updates]
name=CentOS-6 - Updates - 163.com
baseurl=http://mirror.centos.org/centos/6/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-6 - Extras - 163.com
baseurl=http://mirror.centos.org/centos/6/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6 - Plus - 163.com
baseurl=http://mirror.centos.org/centos/6/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-6 - Contrib - 163.com
baseurl=http://mirror.centos.org/centos/6/contrib/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=contrib
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
5、清理yum缓存 
yum clean all 
yum makecache     #将服务器上的软件包信息缓存到本地,以提高搜索安装软件的速度 
yum install vim*    #测试域名是否可用 
至此，Redhat6可以使用CentOS的yum源在线安装软件了！
　　 
主要的镜像地址：
http://mirror.centos.org/centos/6/
http://mirrors.163.com/centos/6/
163镜像的内容不够全，但是速度快，可以优先考虑配置成163镜像，如果报错是404 not found，再配置成centos镜像。