yum如果没有好的源，弄起来也是非常麻烦的。刚才在网上找了一下，有一篇文章介绍得很好，抄过来了。
一、使用163 yum源1.进入http://mirrors.163.com/.help/centos.html下载CentOS-Base-163.repo, 放入/etc/yum.repos.d/2.运行yum makecache生成缓存3.yum search softwarename 查找软件4.yum list softwarename 列出已装软件5.yum install softwarename 安装软件6.yun remove softwarename 卸载软件
地址 http://mirrors.shou.com,使用方法与163的相同 三、使用光盘yum源1.挂载光盘mount -t iso9660 -o loop /dev/cdrom /media/CentOS2.对/etc/yum.repos.d目录改名3.创建新yum.repo.d文件vi /etc/yum.repos.d/iso.repo加入如下字段:[iso]name=isobaseurl=file:///media/Fedora \12 \i386 \DVD/gpgkey=file:///media/Fedora \12 \i386 \DVD/enabled=1gpgcheck=04.刷新reposyum makecache 参考 /etc/yum.repos.d/CentOS-Media.repo文件# CentOS-Media.repo## This repo is used to mount the default locations for a CDROM / DVD on# CentOS-5. You can use this repo and yum to install items directly off the# DVD ISO that we release.## To use this repo, put in your DVD and use it with the other repos too:# yum --enablerepo=c5-media [command]## or for ONLY the media repo, do this:## yum --disablerepo=\* --enablerepo=c5-media [command][c5-media]name=CentOS-$releasever - Mediabaseurl=file:///media/CentOS/ file:///media/cdrom/ file:///media/cdrecorder/gpgcheck=1enabled=0gpgkey=file:///etc/pki/rpm-gpg/RPM
参考地址：http://blog.chinaunix.net/uid-23036581-id-2230523.html