1.备份本地yum源

[root@bogon ~]# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak

2.获取阿里yum源配置文件

[root@bogon ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3.更新yum缓存

[root@bogon ~]# yum makecache

4.查看当前yum源

[root@bogon ~]# yum repolist