redhat6.1yum源更换为centOSyum源
Redhat Enterprise Linux 6.1 x86_64 使用官方yum源是需要收费的，本文将讲解如何使用免费的CentOS的yum源来安装/更新软件。分成以下几步：
1.卸载已有的yum
2.下载CentOS的yum包
3.安装CentOS的yum包
4.更新repo文件
5.清除旧缓存
6.使用测试

1.卸载已有的yum

查看已安装的yum包有哪些：

#rpm -aq|grep yum

卸载已安装的yum包：

#rpm -aq|grep yum | xargs rpm -e --nodeps

2.下载CentOS的yum包

从163镜像（http://mirrors.163.com/centos/6/os/x86_64/Packages/）下载以下几个包（不同时间下载包的版本或许不同）：

python-iniparse-0.3.1-2.1.el6.noarch.rpmyum-3.2.29-30.el6.centos.noarch.rpmyum-metadata-parser-1.1.2-16.el6.x86_64.rpmyum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

3.安装CentOS的yum包

#rpm -ivh *.rpm

4.更新repo文件

进入配置目录：

#cd /etc/yum.pos.d

如果目录中没有rhel-debuginfo.repo文件，则新建一个，修改内容为：

[base]name=CentOS-$releasever - Basebaseurl=http://mirrors.163.com/centos/6/os/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6#released updates[updates]name=CentOS-$releasever - Updatesbaseurl=http://mirrors.163.com/centos/6/updates/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6#packages used/produced in the build but not released#[addons]#name=CentOS-$releasever - Addons#baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/#gpgcheck=1#gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6#additional packages that may be useful[extras]name=CentOS-$releasever - Extrasbaseurl=http://mirrors.163.com/centos/6/extras/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever - Plusbaseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/gpgcheck=1enabled=0

5.清除旧缓存

#yum clean all

6.使用测试

列举yum包：

#yum list