1、查询安装的rpm包

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rpm -qa|grep yum

2. 删除自带的 rpm包

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rpm -qa|grep yum|xargs rpm -e --nodeps

因为一些包之间可能会有依赖关系，所以我们需要加上参数 --nodeps 无视依赖关系。

3. 下载rpm包

rpm包下载地址http://mirrors.163.com/centos/6.9/os/i386/

在这个网站里，你可以自己选择需要下载的文件，进入形如5/或者6/的文件下载，其他的无法下载。7.0版本以后不支持i386，只支持x86_64。

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# rpm -qa|grep yum

yum-3.2.29-81.el6.centos.noarch.rpm   

yum-plugin-fastestmirror-1.1.30-40.el6.noarch.rpm

yum-metadata-parser-1.1.2-16.el6.i686.rpm   

yum-plugin-security-1.1.30-40.el6.noarch.rpm

yum-utils-1.1.30-40.el6.noarch.rpm

# mkdir yum
# cd yum/
wget http:
//mirrors
.163.com
/centos/6
.9
/os/i386/Packages/yum-3
.2.29-81.el
6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6.9/os/i386/Packages/yum-plugin-fastestmirror-1.1.30-40.el6.noarch.rpm
wget http://mirrors.163.com/centos/6.9/os/i386/Packages/yum-metadata-parser-1.1.2-16.el6.i686.rpm

wget http://mirrors.163.com/centos/6.9/os/i386/Packages/yum-plugin-security-1.1.30-40.el6.noarch.rpm

wget http://mirrors.163.com/centos/6.9/os/i386/Packages/yum-utils-1.1.30-40.el6.noarch.rpm

4、安装RPM包

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# rpm -ivh *.rpm

# rpm -ivh yum*.rpm

5、删除原来的yum源

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# cd /etc/yum.repos.d

# rm -f *.repo

6、下载163的yum源

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

7、编辑yum源repo文件

把文件里面的$releasever全部替换为版本号: 6.9

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vim CentOS6-Base-163.repo
name=CentOS-$releasever - Base - 163.com
baseurl=http://mirrors.163.com/centos/6.9/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates - 163.com
baseurl=http:
//mirrors
.163.com
/centos/6
.9
/updates/
$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=http:
//mirror
.centos.org
/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - 163.com
baseurl=http:
//mirrors
.163.com
/centos/6
.9
/extras/
$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http:
//mirror
.centos.org
/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - 163.com
baseurl=http:
//mirrors
.163.com
/centos/6
.9
/centosplus/
$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
gpgcheck=1
enabled=0
gpgkey=http:
//mirror
.centos.org
/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib - 163.com
baseurl=http:
//mirrors
.163.com
/centos/6
.9
/contrib/
$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
gpgcheck=1

enabled=0

gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

8、清理并重建缓存

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yum clean all

yum makecache fast

9、更换完毕。