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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font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
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}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
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.csharpcode .lnum { color: #606060; }
#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