转自：http://elf8848.iteye.com/blog/455676

如何修改Centos yum源

--------------------------------------
国内yum源： 163和搜狐的yum源。
本文章介绍的yum源支持的版本是CentOS 5系列，理论上支持RHEL5系列。

更新方法如下：

先进入yum源配置目录
cd /etc/yum.repos.d

备份系统自带的yum源
mv CentOS-Base.repo CentOS-Base.repo.save

下载其他更快的yum源
中科大的yum源：（现在打不开了 ）
wget http://centos.ustc.edu.cn/CentOS-Base.repo

163的yum源：
wget http://mirrors.163.com/.help/CentOS-Base-163.repo
修改CentOS-Base.repo （不修改会报错），下载到本地把“$releasever”，替换成“5”

sohu的yum源
wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo

更新玩yum源后，建议更新一下，使操作立即生效
yum makecache




RedHat5.6使用CentOS yum源更新的方法
================================================================================

由于RedHat的yum在线更新是收费的，我们的RedHat没有注册，不能在线更新下载rpm包。
需将RedHat的yum卸载后，重启安装Centos的yum,再配置其他yum源。



一、确认RedHat的版本
cat /etc/redhat-release
uname -m

二、删除redhat原有的yum源
rpm -aq|grep yum|xargs rpm -e --nodeps

三、下载CentOS的yum安装包（163源） (可以在这里手工找rpm包：http://mirrors.163.com/centos/)
32位系统：
wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
64位系统：
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm

还依赖python-iniparse-0.2.3-4.el5.noarch.rpm，
但我的系统里已安装了，是系统默认Python2.4中自带的。
如果你的系统没有安装，请安装吧。

四、安装yum软件包
32位系统：
rpm -ivh yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
rpm -ivh yum-3.2.22-39.el5.centos.noarch.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
注意：最后两个安装包要放在一起同时安装，否则会提示相互依赖，安装失败。

64位系统：
rpm -ivh yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm
rpm -ivh yum-3.2.22-39.el5.centos.noarch.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
注意：最后两个安装包要放在一起同时安装，否则会提示相互依赖，安装失败。


五、更改yum源 #我们使用网易的CentOS镜像源
cd /etc/yum.repos.d/
vi CentOS6-Base-163.repo
# CentOS-Base.repo
#
# 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 - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/5/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-5 - Updates - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=addons
baseurl=http://mirrors.163.com/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-5 - Extras - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=centosplus
baseurl=http://mirrors.163.com/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib - 163.com
mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=contrib
baseurl=http://mirrors.163.com/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5



六、清理
yum clean all
yum makecache

如果报错：imary.sqlite.bz2 from base: [Errno 256] No more mirrors to try.
执行：yum makecache







七、更新

cd /etc/pki/rpm-gpg
wget http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

yum update



很长时间的下载后，报错：

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
GPG key retrieval failed: [Errno 5] OSError: [Errno 2] No such file or directory: '/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5'
这是因为：指定的文件/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5在本地不存在导致的。

解决：
去官网http://mirror.centos.org/centos/下载相应文件
cd /etc/pki/rpm-gpg
wget http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

================================================================================




RedHat6.0使用CentOS yum源更新的方法
--------------------------------------------------------------------

由于RedHat的yum在线更新是收费的，我们的RedHat没有注册，不能在线更新下载rpm包。
需将RedHat的yum卸载后，重启安装Centos的yum,再配置其他yum源。


一、确认RedHat的版本
cat /etc/redhat-release
uname -m

二、删除redhat原有的yum源
rpm -aq|grep yum|xargs rpm -e --nodeps

三、下载CentOS的yum安装包（163源）
32位系统 ：
wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-3.2.29-22.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-metadata-parser-1.1.2-16.el6.i686.rpm
wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-plugin-fastestmirror-1.1.30-10.el6.noarch.rpm
wget http://mirrors.163.com/centos/6/os/i386/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm

四、安装yum软件包
rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.2-16.el6.i686.rpm
rpm -ivh yum-3.2.29-22.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-10.el6.noarch.rpm
注意：最后两个安装包要放在一起同时安装，否则会提示相互依赖，安装失败。

五、更改yum源 #我们使用网易的CentOS镜像源
cd /etc/yum.repos.d/
vi CentOS6-Base-163.repo
# CentOS-Base.repo
#
# 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-6 - Base - 163.com
baseurl=http://mirrors.163.com/centos/6/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

#released updates
[updates]
name=CentOS-6 - Updates - 163.com
baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

#additional packages that may be useful
[extras]
name=CentOS-6 - Extras - 163.com
baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

#contrib - packages by Centos Users
[contrib]
name=CentOS-6 - Contrib - 163.com
baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=contrib
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6


六、清理
yum clean all
yum makecache

如果报错：imary.sqlite.bz2 from base: [Errno 256] No more mirrors to try.
执行：yum makecache

至此，Redhat6可以使用CentOS的yum源在线安装软件了！