redhat 默认自带的 yum 源需要注册，才能更新，所以对于我们来说需要替换掉redhat的yum源。下文更换为网易的。
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删除原有的yum
rpm -qa|grep yum|xargs rpm -e --nodeps
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下载yum安装文件
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.29-81.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm
[注] 下载时可能会找不到文件，登录http://mirrors.163.com/centos/6/os/x86_64/ 更换相应的文件。
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安装
rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
rpm -ivh yum-3.2.29-81.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
[注] 最后两个包需要同时安装，因为存在相互依赖
然而在执行最后一个安装命令时，出现了如下错误：
1 [[email?protected] test]# rpm -ivh yum-3.2.29-81.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
2 warning: yum-3.2.29-81.el6.centos.noarch.rpm: Header V3 RSA/SHA1 Signature,key ID c105b9de: NOKEY
3 error: Failed dependencies:
4 python-urlgrabber >= 3.9.1-10 is needed by yum-3.2.29-81.el6.centos.noarch
错误原因是缺少了3.9.1-10及以上版本的python-urlgrabber的依赖，所以从http://mirrors.163.com/centos/6/os/x86_64/ 寻找所需要的包。
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-11.el6.noarch.rpm
然后安装时又出错了：
1 [[email?protected] test]# rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm
2 warning: python-urlgrabber-3.9.1-11.el6.noarch.rpm: Header V3 RSA/SHA1 Signature,key ID c105b9de: NOKEY
3 Preparing... ########################################### [100%]
4 file /usr/lib/python2.6/site-packages/urlgrabber/grabber.py from install of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from package python-urlgrabber-3.9.1-9.el6.noarch
5 file /usr/lib/python2.6/site-packages/urlgrabber/grabber.pyc from install of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from package python-urlgrabber-3.9.1-9.el6.noarch
6 file /usr/lib/python2.6/site-packages/urlgrabber/grabber.pyo from install of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from package python-urlgrabber-3.9.1-9.el6.noarch
7 file /usr/lib/python2.6/site-packages/urlgrabber/progress.pyc from install of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from package python-urlgrabber-3.9.1-9.el6.noarch
8 file /usr/lib/python2.6/site-packages/urlgrabber/progress.pyo from install of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from package python-urlgrabber-3.9.1-9.el6.noarch
与历史版本冲突了，在rpm安装的命令中加入--force 强制安装成功：
1 [[email?protected] test]# rpm -ivh --force python-urlgrabber-3.9.1-11.el6.noarch.rpm
2 warning: python-urlgrabber-3.9.1-11.el6.noarch.rpm: Header V3 RSA/SHA1 Signature,key ID c105b9de: NOKEY
3 Preparing... ########################################### [100%]
4 1:python-urlgrabber ########################################### [100%]
最后执行第三条安装命令成功：
1 [[email?protected] test]# rpm -ivh yum-3.2.29-81.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-41.el6.noarch.rpm
2 warning: yum-3.2.29-81.el6.centos.noarch.rpm: Header V3 RSA/SHA1 Signature,key ID c105b9de: NOKEY
3 Preparing... ########################################### [100%]
4 1:yum-plugin-fastestmirro########################################### [ 50%]
5 2:yum ########################################### [100%]
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更换yum源
mv /etc/yum.repos.d/rhel-source.repo /etc/yum.repos.d/rhel-source.repo.bak
vim /etc/yum.repos.d/rhel-debuginfo.repo
内容为：
1 [base]
2
3 name=CentOS-$releasever - Base
4
5 baseurl=http://mirrors.163.com/centos/6/os/$basearch/
6
7 gpgcheck=1
8
9 gpgkey=http://mirrors.163.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
10
11 #released updates
12
13 [updates]
14
15 name=CentOS-$releasever - Updates
16
17 baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
18
19 gpgcheck=1
20
21 gpgkey=http://mirrors.163.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
22
23 #packages used/produced in the build but not released
24
25 #[addons]
26
27 #name=CentOS-$releasever - Addons
28
29 #baseurl=http://mirrors.163.com/centos/6/addons/$basearch/
30
31 #gpgcheck=1
32
33 #gpgkey=http://mirrors.163.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
34
35 #additional packages that may be useful
36
37 [extras]
38
39 name=CentOS-$releasever - Extras
40
41 baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
42
43 gpgcheck=1
44
45 gpgkey=http://mirrors.163.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
46
47 #additional packages that extend functionality of existing packages
48
49 [centosplus]
50
51 name=CentOS-$releasever - Plus
52
53 baseurl=http://mirrors.163.com/centos/6./centosplus/$basearch/
54
55 gpgcheck=1
56
57 enabled=0
yum clean all 命令清除原有缓存，就成功了。
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参考：
[1]?redhat6.5 配置使用centos的yum源
[2]?RHEL6配置yum源
