CentOS的yum源

1.中科大
  步骤一：
     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

  步骤二：
     rpm –import http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

  ）
修改 /etc/yum.repo.d/CentOS-Base.repo  （以下其他源做法一样）

# 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

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

2.清华大学
# 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
repo=os
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/os/$basearch/
gpgcheck=1
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5

[update]
name=CentOS-5 - Updates
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/updates/$basearch/
gpgcheck=1
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5

[addons]
name=CentOS-5 - Addons
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/addons/$basearch/
gpgcheck=1
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5

[extras]
name=CentOS-5 - Extras
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/extras/$basearch/
gpgcheck=1
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5

[centosplus]
name=CentOS-5 - Plus
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5

[contrib]
name=CentOS-5 - Contrib
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/centos/5.2/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=ftp://ftp3.tsinghua.edu.cn/mirror/centos/RPM-GPG-KEY-CentOS-5