centos6.8 更新yum源

1. 进入/etc/yum.repo.d/目录下

cd /etc/yum.repo.d/

2. 备份CentOS-Media.repo

mv CentOS-Media.repo{,.bak}

3.curl下载repo文件

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

或者

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

4. 生成缓存

yum makecache