Centos系统32位/64位，不能执行yum，如何安装yum?怎样安装yum软件？下面我们给出centos5的安装脚本：

Centos系统32位安装yum的方法：

rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/elfutils-libs-0.137-3.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/gmp-4.1.4-10.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/readline-5.1-3.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-2.4.3-27.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/libxml2-2.6.26-2.1.2.8.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/libxml2-python-2.6.26-2.1.2.8.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/expat-1.95.8-8.2.1.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-elementtree-1.2.6-5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/sqlite-3.3.6-5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-sqlite-1.1.7-1.2.1.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/elfutils-0.137-3.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/rpm-python-4.4.2.3-18.el5.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/m2crypto-0.16-6.el5.6.i386.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-urlgrabber-3.1.0-5.el5.noarch.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm



wget http://centos.ustc.edu.cn/centos/5.4/os/i386/CentOS/yum-3.2.22-20.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5.4/os/i386/CentOS/yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm
rpm -ivh yum*.rpm

yum -y update

Centos系统64位安装yum的方法：

rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/elfutils-libs-0.137-3.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/gmp-4.1.4-10.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/readline-5.1-3.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/python-2.4.3-27.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/libxml2-2.6.26-2.1.2.8.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/libxml2-python-2.6.26-2.1.2.8.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/expat-1.95.8-8.2.1.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/python-elementtree-1.2.6-5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/sqlite-3.3.6-5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/python-sqlite-1.1.7-1.2.1.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/elfutils-0.137-3.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/rpm-python-4.4.2.3-18.el5.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/m2crypto-0.16-6.el5.6.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/python-urlgrabber-3.1.0-5.el5.noarch.rpm
rpm -Uvh http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm



wget http://centos.ustc.edu.cn/centos/5.4/os/x86_64/CentOS/yum-3.2.22-20.el5.centos.noarch.rpm
wget http://centos.ustc.edu.cn/centos/5.4/os/x86_64/CentOS/yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm
rpm -ivh yum*.rpm

yum -y update