Linux Redhat 安装免费yum源
出处地址：http://www.cnblogs.com/nbartchen/p/8565816.html
1、查看是否安装相关包
rpm -qa|grep yum|xargs rpm -e --nodeps
2、下载rpm包到本地、并安装
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm
3、安装rpm包
rpm -ivh yum-*
4、备份redhat yum源，新建免费yum源目录
mv /etc/yum.repos.d/ /etc/yum.repos.d.backup
mkdir /etc/yum.repos.d
5、下载yum Centos7 yum源、移动到yum目录
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo mv CentOS7-Base-163.repo /etc/yum.repos.d
6、修改文件相关内容
# 进入文件 编辑 CentOS7-Base-163.repo :%s/$releasever/7/g
7、更新yum缓存测试使用
yum clean all
yum makecache
yum repolist all
原文：https://www.cnblogs.com/xiangsikai/p/10688753.html