官方链接【CentOS镜像使用帮助】：http://mirrors.163.com/.help/centos.html
---------------------------------------------------------------
首先备份/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)
- CentOS7 wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
- CentOS6 wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
- CentOS5 wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
运行以下命令生成缓存
yum clean all yum makecache