針對CentOS源代碼更新的問題，有很多版本的修改方法，根據最近的CentOS源代碼更新，我們以CentOS5.3的上海交大更新源為例來進行講解。

1．CentOS源代碼修改/etc/yum.repos.d/CentOS-Base.repo為:

base]  
name=CentOS-5-Base  
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever5&arch=$basearch&  
repo=os 
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/  
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/os/$basearch/  
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 
#releasedupdates  
[update]  
name=CentOS-5-Updates  
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=updates 
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/updates/$basearch/  
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 
#packagesused/producedinthebuildbutnotreleased  
[addons]  
name=CentOS-***ddons  
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=addons 
 
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/addons/$basearch/  
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 
#additionalpackagesthatmaybeuseful  
[extras]  
name=CentOS-5-Extras  
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=extras 
 
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/extras/$basearch/  
gpgcheck=1 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 
#additionalpackagesthatextendfunctionalityofexistingpackages  
[centosplus]  
name=CentOS-5-Plus  
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=centosplus 
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/centosplus/$basearch/  
gpgcheck=1 
enabled=0 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 
#contrib-packagesbyCentosUsers  
[contrib]  
name=CentOS-5-Contrib  
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=contrib 
baseurl=http://ftp.sjtu.edu.cn/centos/5.3/contrib/$basearch/  
gpgcheck=1 
enabled=0 
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5  
 

2．CentOS源代碼校驗Key導入：執行rpm --import http://ftp.sjtu.edu.cn/centos/5.3/os/i386/RPM-GPG-KEY-CentOS-5

3．CentOS源代碼進行升級：執行yum update

好了，這樣我們就完成了修改CentOS源代碼更新。

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