昨天把centos升了下级。cn99的源失效后，很难找到速度能与之相比的源就一直没更新，突然发现中科大的源又恢复了，就换了源升了下级，电信访问速度还是很快的！
安装后请按照以下步骤修改CenOS-Base.repo,以后就可以方便的用yum安装软件了. cd /etc/yum.repos.d mv CentOS-Base.repo CentOS-Base.repo.save wget http://centos.ustc.edu.cn/CentOS-Base.repo.5 mv CentOS-Base.repo.5 CentOS-Base.repo
顺便再记录几个centos的源：
上海交通大学：http://ftp.sjtu.edu.cn/centos/
清华大学：http://mirror.lib.tsinghua.edu.cn/centos/
山东电信：http://mirrors.ta139.com/centos/
一直用ubuntu，现在我的本本就是ubuntu，一直用cn99的源，电信速度非常快。前两天装了cnetos，一直在找一个稳定且快速的源，就中科大的那个快，其他的都差不多的慢，很怀恋当初ubuntu下用cn99源的感觉，不想一搜之下居然有一个。那就没什么好说的了，用就一个字。
# 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-5 - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever5arch=$basearch& repo=os #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ baseurl=http://mirrors.cn99.com/centos/5/os/$basearch/ gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 #released updates [update] name=CentOS-5 - Updates #mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=updates baseurl=http://mirrors.cn99.com/centos/5/updates/$basearch/ gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 #packages used/produced in the build but not released [addons] name=CentOS-5 - Addons #mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=addons baseurl=http://mirrors.cn99.com/centos/5/addons/$basearch/ gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 #additional packages that may be useful [extras] name=CentOS-5 - Extras #mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=extras baseurl=http://mirrors.cn99.com/centos/5/extras/$basearch/ gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-5 - Plus #mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=centosplus baseurl=http://mirrors.cn99.com/centos/5/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5 #contrib - packages by Centos Users [contrib] name=CentOS-5 - Contrib #mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=contrib baseurl=http://mirrors.cn99.com/centos/5/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
中科大的源，暂时停止了，速度相当的快，留下备用
# CentOS-Base.repo
[base]
name=CentOS-$releasever - Base
baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
现在用的香港的源，速度也还是可以，从mirror-list上找到的
# CentOS-Base.repo
[base]
name=CentOS-5 - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever5arch=$basearch&
repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=http://ftp.hostrino.com/pub/centos/5.2/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#released updates
[update]
name=CentOS-5 - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=updates
baseurl=http://ftp.hostrino.com/pub/centos/5.2/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
#mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=addons
baseurl=http://ftp.hostrino.com/pub/centos/5.2/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=extras
baseurl=http://ftp.hostrino.com/pub/centos/5.2/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=centosplus
baseurl=http://ftp.hostrino.com/pub/centos/5.2/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5
#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
#mirrorlist=http://mirrorlist.centos.org/?release=4arch=$basearchrepo=contrib
baseurl=http://ftp.hostrino.com/pub/centos/5.2/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5