我们的第一步就是导入第三方软件仓库RPMForge ，首页进行centos 官网找到RPMForge下载地址

http://wiki.centos.org/AdditionalResources/Repositories/RPMForge/

由于32位和64位系统下载包不一样，所以你先要确认你系统32位还是64位，可以通过以下命令查看

getconf LONG_BIT

然后根据返回值，选择下载地址

32位系统下载地址：

#wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.i686.rpm

64位系统下载地址

#wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm

可以会提示以下错误，是网络连接中断，重复执行一次就可以了。

Resolving rpmforge.sw.be... failed: Name or service not known.

wget: unable to resolve host address `rpmforge.sw.be'

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#rpm -ivh rpmforge-release-*.rpm

搜索一下相关安装包：

yum search memcache

开始安装

#yum -y install –enablerepo=rpmforge memcached php-pecl-memcache

验证一下安装结果，返回版本、参数等信息

#memcached –h

加入到php

#php -m|grep memcache

设置开机启动

#chkconfig memcached on

启动memcached

#service memcached start