1.删除原来的yum

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.添加/etc/yum.repos.d/ 的163源

[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

5.清空yum 缓存

yum clean all 

6.测试 

yum 

7.安装epel 源

yum install epel-release

redhat7.2 解决注册问题 yum