163网易的yum源
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
sohu的yum源
wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo
阿里云
wget http://mirrors.aliyun.com/repo/Centos-7.repo
rpm包常用下载地址
https://centos.pkgs.org/
http://rpmfind.net/
http://dl.fedoraproject.org/pub/epel/