全面整理CentOS系统 yum源代码
大家应该对CentOS系统很了解了，CentOS系统应该是做为服务器的linux的佼佼者。CentOS系统采用的二进制包是rpm，不过包的依赖性解决有时候却是个问题。yum是个不错的东西。yum的使用和debian的apt有几分相似，这样对于许多包的安装就方便多了。
这篇文章主要讲两点内容，一是yum使用方法的整理;二是找一个比较快的国内的源。
1.CentOS系统yum的使用:
1)CentOS系统包的更新
1.1)检查可更新包: yum check-update
1.2)更新所有包: yum update
1.3)更新指定包: yum update package_name
1.4)版本升级: yum upgrade
2)CentOS系统包安装与删除
2.1)yum install package_name
2.2)yum remove package_name
3)CentOS系统包搜索
3.1)搜索特定包: yum search package_name
3.2)搜索包含特定文件名的包:yum provides name
4)CentOS系统包列表
4.1)列出所有安装或更新的包: yum list
4.2)列出指定包:yum list name
4.3)列出可更新包:yum list updates
4.4)列出已安装包:yum list installed
4.5)列出已安装但不包含在资源库中的包:yum list extras
2.CentOS系统yum源设定
2.1)加快yum下载速度: yum -y install yum-fastestmirror,在CentOs 4上名字叫做yum-plugin-fastestmirror
2.2)yum源文件:/etc/yum.repos.d/CentOS-Base.repo
2.3)CentOS 5的yum源设为中国科技大学网站
[root@xuxy ~]# cd /etc/yum.repos.d
2.备份repo
[root@xuxy yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak
3.建立新的CentOS-Base.repo文件：（以CentOS 5.2为例）
[root@xuxy yum.repos.d]#vi CentOS-Base.repo
内容如下（以中国科技大学的yum源为例）：
# CentOS-Base.repo # # This file uses a new mirrorlist system developed by Lance Davis for CentOS. # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # #
[base] name=CentOS-$releasever - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5 #released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates baseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released [addons] name=CentOS-$releasever - Addons #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful [extras] name=CentOS-$releasever - Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras baseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5