1. 首先到 http://mirrors.163.com/centos 下載軟件包

i386地址：http://mirrors.163.com/centos/6/os/i386/Packages/
x86_64地址：http://mirrors.163.com/centos/6/os/x86_64/Packages/
必需要下載的軟件包有（以64位系統(tǒng)為例）：

python-iniparse-0.3.1-2.1.el6.noarch.rpm
yum-3.2.29-69.el6.centos.noarch.rpm
yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm

下載命令（以下僅前兩個有效)：

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.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-3.2.29-69.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm

經(jīng)測試，以上命令僅僅前兩個有效，后兩個軟件包需在http://mirrors.163.com/centos/6/os/x86_64/Packages手工下載下來，再安裝。

2. 卸載RedHat自帶的yum

rpm -qa | grepyum | xargs rpm -e --nodeps

3. 安裝下載的centos的rpm包：

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 -ivhyum-3.2.29-69.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm

4. 下載CentOS6-Base-163.repo文件

到http://mirrors.163.com的centos幫助文檔中下載CentOS6-Base-163.repo文件，存放到/etc/yum.repos.d中:

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

5. 編輯CentOS6-Base-163.repo文件

將 CentOS6-Base-163.repo 文件其中的 $releasever 更改為centos的版本號。
以下是修改好的(文件夾中有修改好的CentOS6-Base-163.repo，可直接替換后使用)：

#CentOS-Base.repo
# Themirror system uses the connecting IP address of the client and the
# updatestatus of each mirror to pick mirrors that are updated to and
#geographically close to the client.  You should use this for CentOSupdates
#unless you are manually picking other mirrors.
# Ifthe 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

#releasedupdates
[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

#additionalpackages 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

#additionalpackages 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

6. 清除原有緩存

yum clean all

如果提示yum源被另一個進(jìn)程鎖住了錯誤，使用一下命令解鎖：

rm -rf /var/run/yum.pid

7. 獲取yum列表

yum makecache

出現(xiàn)下面提示，表示yum更改完成：
Metadata CacheCreated