更新centos yum源为163源的步骤

centos使用yum安装lighttpd的时候出现以下报错，不用说，yum源用的官方的，在我大天朝当然走不通了，更新成163的源试试
yum install lighttpd
Loaded plugins: fastestmirror
Determining fastest mirrors
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 7 - ""
Error: Cannot find a valid baseurl for repo: base

更新centos yum源的步骤

[1] 首先备份/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[2] 进入yum源配置文件所在文件夹
cd /etc/yum.repos.d/
[3] 下载163的yum源配置文件，放入/etc/yum.repos.d/(操作前请做好相应备份)
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
[4] 运行yum makecache生成缓存
yum makecache
[5] 更新系统
yum -y update