国内yum较快的源

cd /etc/yum.repos.d/ 
cp rhel-debuginfo.repo rhel-debuginfo.repo.bak 
先删除rhel-debuginfo.repo文件中所有内容，然后复制添加以下内容： 

[base]
name=centos-5 - Base
baseurl=
# the other site:
# you can find more site in:
enabled=1
gpgcheck=0
gpgkey=RPM-GPG-KEY-CentOS-5

#released updates
[update]
name=CentOS-5 - Updates
baseurl=
gpgcheck=0
gpgkey=RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
baseurl=
gpgcheck=0
gpgkey=RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
baseurl=
gpgcheck=0
gpgkey=

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
baseurl=
gpgcheck=0
enabled=0
gpgkey=RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
baseurl=
gpgcheck=0
enabled=0
gpgkey=RPM-GPG-KEY-CentOS-5

#packages in testing
[testing]
name=CentOS-5 - Testing
baseurl=
gpgcheck=0
enabled=0
gpgkey=RPM-GPG-KEY-CentOS-5

记里记住把gpgcheck=1置换成gpgcheck=0.不然用一阵子后出现gpgkey错误的提示。

然后导入key

rpm --import

这个源地址应该是国内比较快的一个yum库了。