下载安装包：http://download.csdn.net/detail/junny_zxj/2664307
#tar zxvf yum-3.4.3.tar.gz
yum-3.4.3/
# cd yum-3.4.3
# ls
centos-yumconf_4-4.3_noarch.rpm
python-elementtree_1.2.6-4_i386.rpm
python-sqlite_1.1.6-1_i386.rpm
python-urlgrabber_2.9.6-2_noarch.rpm
sqlite_3.2.2-1_i386.rpm
yum_2.4.0-1.centos4_noarch.rpm
# rpm -ivh *.rpm
warning: python-elementtree-1.2.6-7.el4.rf.i386.rpm: V3 DSA signature: NOKEY,
key ID 6b8d79e6
Preparing... ########################################### [100%]
1:sqlite ########################################### [ 20%]
2:python-sqlite ########################################### [ 40%]
3:python-urlgrabber ########################################### [ 60%]
4:python-elementtree ########################################### [ 80%]
5:yum ########################################### [100%]
# cp CentOS-Base.repo /etc/yum.repos.d/
执行如下命令导入GPG Key
# rpm --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-4
现在yum就可以使用了。