redhat 的更新包只对注册的用户生效，所以我们自己手动更改成CentOS 的更新包，CentOS几乎和redhat是一样的，所以无需担心软件包是否可安装，安装之后是否有问题。

（前提是wget包已安装）

1、首先删除redhat原有的yum ，因为redhat 原本的yum 没有注册为redhat用户是用不了的。

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

rpm -aq|grep python-iniparse|xargs rpm -e --nodeps 

2、下载163的yum 安装包

# wget http://mirrors.163.com/centos/7.2.1511/os/x86_64/Packages/yum-3.4.3-132.el7.centos.0.1.noarch.rpm

# wget http://mirrors.163.com/centos/7.2.1511/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm

# wget http://mirrors.163.com/centos/7.2.1511/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

# wget http://mirrors.163.com/centos/7.2.1511/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm 

3、安装下载的rpm包

rpm -ivh *.rpm

4、创建文件/etc/yum.repos.d/rhel-debuginfo.repo并写入

[base]

name=CentOS-$releasever - Base

baseurl=http://mirrors.163.com/centos/7.2.1511/os/$basearch/

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/7.2.1511/os/x86_64/RPM-GPG-KEY-CentOS-7

#released updates

[updates]

name=CentOS-$releasever - Updates

baseurl=http://mirrors.163.com/centos/7.2.1511/updates/$basearch/

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/7.2.1511/os/x86_64/RPM-GPG-KEY-CentOS-7

[extras]

name=CentOS-$releasever - Extras

baseurl=http://mirrors.163.com/centos/7.2.1511/extras//$basearch/

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/7.2.1511/os/x86_64/RPM-GPG-KEY-CentOS-7

[centosplus]

name=CentOS-$releasever - Plus

baseurl=http://mirrors.163.com/centos/7.2.1511/centosplus//$basearch/

gpgcheck=1

enabled=0

6、 yum clean all

7、 yum update 测试。

8、 安装 epel 源

# yum install epel-release

--来自http://blog.csdn.net/wylfengyujiancheng/article/details/50418930#comments