1、备份本地源
root@localhost yum.repos.d]# cp CentOS-Base.repo CentOS-Base_Backup.repo
2、获取阿里yum官方源
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
3、更新yum缓存
[root@localhost yum.repos.d]# yum makecache
4、获取阿里epel源
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
5、更新缓存
[root@localhost yum.repos.d]# yum makecache
6、查看yum源
[root@localhost yum.repos.d]# yum repolist Loaded plugins: fastestmirror Repository base is listed more than once in the configuration Repository updates is listed more than once in the configuration Repository extras is listed more than once in the configuration Repository centosplus is listed more than once in the configuration Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com repo id repo name status base/7/x86_64 CentOS-7 - Base - mirrors.aliyun.com 10,070 epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 13,441 extras/7/x86_64 CentOS-7 - Extras - mirrors.aliyun.com 413 updates/7/x86_64 CentOS-7 - Updates - mirrors.aliyun.com 1,127 repolist: 25,051 You have new mail in /var/spool/mail/root