yum安装

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首先 rpm -qa|grep yum 查看 yum 服务相关的包
# rpm -qa|grep yum
yum-security-1.1.16-13.el5_4.1
yum-3.2.22-33.el5
yum-updatesd-0.9-2.el5
yum-metadata-parser-1.1.2-3.el5

# rpm -qa|grep yum|xargs rpm -e --nodeps 强制删除这一些包 CentOS yum 服务相关的 rpm 包

--64位机器安装
wget http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm

--32位机器安装
wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm

--镜像可能有变化，如果镜像找不到。在浏览器中找好http://centos.ustc.edu.cn/centos/5/os
# rpm -ivh yum-*

# cd /etc/yum.repos.d/
# mv rhel-debuginfo.repo rhel-debuginfo.repo.bakup
# mv rhel-source.repo rhel-source.repo.bakup
# wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo (下载CentOS的repo包)
# yum makecache 等待 yum 库更新完毕，就可以 yum 安装软件了