1、首先备份系统自带yum源配置文件/etc/yum.repos.d/CentOS-Base.repo
[root@localhost ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、进入yum源配置文件所在的文件夹
[root@localhost ~]# cd /etc/yum.repos.d/
3、下载163的yum源配置文件到上面那个文件夹内
CentOS7 [root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo CentOS6 [root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo CentOS5 [root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
4、运行yum makecache生成缓存
[root@localhost yum.repos.d]# yum makecache
原文：https://www.cnblogs.com/hoganhome/p/12134225.html