RHEL中安装Centos的yum的步骤

1.删除RedHat原有的yum：

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

2.下载yum安装组件：（随本机安装版本而定）

wget http://mirrors.163.com/centos/6.3/os/x86_64/Packages/yum-3.2.29-30.el6.centos.noarch.rpm 
wget http://mirrors.163.com/centos/6.3/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6.3/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
wget http://mirrors.163.com/centos/6.3/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm

如果不能下载也可以使用自己另外下载的centos里面的安装包

3.进行安装yum

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-3.2.29-30.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

最后两个包一块安装，会相互依赖

4.在/etc/yum.repos.d/文件夹下新建一个名为rhel-debuginfo.repo的文件，使用gedit输入以下的内容:

[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

#released updates
[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

#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/6.3/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/6.3/centosplus/$basearch/
gpgcheck=1
enabled=0

5.yum clean all

6.这时候也可以测试一下yum命令是否可用，也可以使用yum update进行升级。

yum install vim