在Linux下，安装软件，对菜鸟来言，是比较困难的，一个是通过rpm 的安装包进行安装
如：# rpm －ivh ****.rpm
如果没有相应的安装包，源码包的安装方式，命令参数让人害怕，出现编译错误不各所措。
现在系统自带的yum安装软件却是自动化的，但是发现系统自带的yum源却有问题，安装的时候，老是显示404错误，故在root权限下修改相应的yum源，
/etc/yum.repos.d/CentOS-Base.repo是相应山高皇帝远的配置文件：
加了几个相应的源
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
http://mirror.be10.com/centos/$releaserver/os/$basearch/
http://centos.candishosting.com.cn/$releaserver/os/$basearch/
http://ftp.hostrno.com/pub/centos/$releaserver/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
http://mirror.be10.com/centos/$releaserver/os/$basearch/
http://centos.candishosting.com.cn/$releaserver/os/$basearch/
http://ftp.hostrno.com/pub/centos/$releaserver/os/$basearch/
gpgcheck=1
后来又进行了修改
baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
http://mirror.be10.com/centos/$releaserver/os/$basearch/
http://centos.candishosting.com.cn/$releaserver/os/$basearch/
http://ftp.hostrno.com/pub/centos/$releaserver/os/$basearch/
http://mirrors.163.com/$releaserver/os/$basearch/
http://mirrors.sohu.com/$releaserver/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
$releasever:这是版本叼，我用的是Centos6.3这个版本
$basearch:这是体系号，就是指x86_64,i386,i586这类东西
#mirrorlist：是指向一个镜像表表，
http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=updates
这儿注掉了
然后在通过yum
[root@localhost yum.repos.d]# yum install cvs
Loaded plugins: fastestmirror, refresh-packagekit, security
……………………………………。
Installed:
cvs.x86_64 0:1.11.23-16.el6
Complete!
验证cvs是否已经安装上了：
[root@localhost yum.repos.d]# rpm -qa cvs
cvs-1.11.23-16.el6.x86_64
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这儿是从这儿参考的
http://www.360doc.com/content/10/1208/11/2614615_76081510.shtml
http://www.gzidc.org/serverq/n487.html
http://lxsym.blog.51cto.com/1364623/289151
centOS下yum安装配置samba
http://lxsym.blog.51cto.com/1364623/289156
如果yum也没有请参考这个链接
http://blog.csdn.net/cyxlxp8411/article/details/8781021
CentOS不注册的话，yum是用不了，Redhat即使注册了，貌似yum还是用不了。不知道rhel官方yum源是不是要另外收费的？哪位筒子给我扫下盲
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RedHat linux配置yum本地资源
http://blog.csdn.net/cyxlxp8411/article/details/8780991
http://wenku.baidu.com/link?url=CpMTZ8PGCHKLmgzyK2nWHJGUzUSZ6-WJJ1viZ_DTCoy8snd00_N9vhPxVLk8xjimoHgK-6lvOxdYe19qpYWg_3zUb7yZMw_VwFc5MpDefoC
http://tst.a9188.com/yum/46.html