修改Centos 6.5的yum源

1.进入目录

cd /etc/yum.repos.d/

2.保持副本

mv CentOS-Base.repo  CentOS-Base.repo.backup

3.下载新的CentOS-Base.repo 到/etc/yum.repos.d/

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

4.运行yum makecache生成缓存

yum clean all
yum makecache