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.rpm
yum-3.2.29-30.el6.centos.noarch.rpm
yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
yum-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-$releasever - Base
baseurl=http://mirrors.163.com/centos/6/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
gpgcheck=1
gpgkey=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 - Extras
baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
gpgcheck=1
enabled=0

5.清除旧缓存

#yum clean all

6.使用测试

列举yum包：

#yum list