将Centos7的yum配置为阿里云的镜像（完美解决yum下载太慢的问题）

参考

http://mirrors.aliyun.com/help/centos?spm=5176.bbsr150321.0.0.d6ykiD

如何查看已安装的CentOS版本信息:http://www.ks7.net/server/837.shtml

话不多说，上命令

1、备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

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

CentOS 5

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

CentOS 6

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

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、之后运行yum makecache生成缓存