1、系统自带

base
extras
updates

2、epel

yum install epel-release

https://fedoraproject.org/wiki/EPEL

3、el（用于升级内核）

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

http://elrepo.org/tiki/tiki-index.php

4、sclo（用于安装Red Hat software collection）

yum install centos-release-scl-rh centos-release-scl

https://wiki.centos.org/AdditionalResources/Repositories/SCL

常用CentOS 6/7 扩展源