centos更换阿里yum源和epel

centos6.XX更换阿里云的源

1，安装wget：yum install -y wget

2，备份原来的yum源: mv  /etc/yum.repos.d /etc/yum.repos.d_bk

1、删除现有的源：rm -rf /etc/yum.repos.d/*  
2、下载阿里yum源文件：wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-6.repo http://mirrors.aliyun.com/repo/Centos-6.repo

3，清理缓存：yum clean all

这个时候，执行 yum repolist的结果如下
[root@di02 ~]# yum repolist
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
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