OPERATION04 - memcached原理 部署memcached、Session共享

OPERATION DAY04

案例1:构建memcached服务
案例2:LNMP+memcached
案例3:PHP的本地Session信息
案例4:PHP实现session共享


1 案例1:构建memcached服务

1.1 问题

本案例要求先快速搭建好一台memcached服务器,并对memcached进行简单的增、删、改、查操作:

  • 安装memcached软件,并启动服务
  • 使用telnet测试memcached服务
  • 对memcached进行增、删、改、查等操作

1.2 方案

使用1台RHEL7虚拟机作为memcached服务器(192.168.4.5)。

在RHEL7系统光盘中包含有memcached,因此需要提前配置yum源,即可直接使用yum安装,客户端测试时需要提前安装telnet远程工具。

验证时需要客户端主机安装telnet,远程memcached来验证服务器的功能:

  • add name 0 180 10 //变量不存在则添加
  • set name 0 180 10 //添加或替换变量
  • replace name 0 180 10 //替换
  • get name //读取变量
  • append name 0 180 10 //向变量中追加数据
  • delete name //删除变量
  • stats //查看状态
  • flush_all //清空所有
  • 提示:0表示不压缩,180为数据缓存时间,10为需要存储的数据字节数量。

1.3 步骤

实现此案例需要按照如下步骤进行。

步骤一:构建memcached服务

1)使用yum安装软件包memcached

  1. [[email protected] ~]# yum -y install memcached
  2. [[email protected] ~]# rpm -qa memcached
  3. memcached-1.4.15-10.el7_3.1.x86_64

2) memcached配置文件

  1. [[email protected] ~]# vim /usr/lib/systemd/system/memcached.service
  2. ExecStart=/usr/bin/memcached -u USER<spanclass="shsymbol"style="color:rgb(255,0,128);fontweight:bold;"></span>pPORT -m CACHESIZE<spanclass="shsymbol"style="color:rgb(255,0,128);fontweight:bold;"></span>cMAXCONN OPTIONS</li><li style="list-style:none outside;"></li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># <span class="sh_normal">vim </span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">etc</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">sysconfig</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>memcached</li><li style="list-style:none outside;">PORT<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_string" style="color:rgb(166,133,0);">"11211"</span></li><li style="list-style:none outside;">USER<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_string" style="color:rgb(166,133,0);">"memcached"</span></li><li style="list-style:none outside;">MAXCONN<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_string" style="color:rgb(166,133,0);">"1024"</span></li><li style="list-style:none outside;">CACHESIZE<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_string" style="color:rgb(166,133,0);">"64"</span></li><li style="list-style:none outside;">OPTIONS<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_string" style="color:rgb(166,133,0);">""</span></li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">3)启动服务并查看网络连接状态验证是否开启成功:</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># systemctl  start  memcached</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># systemctl  status  memcached</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># netstat  <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>anptu  <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">|</span>  grep memcached</li><li style="list-style:none outside;">tcp&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span>&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0.0.0.0</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:</span><span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">11211</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0.0.0.0</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:*</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LISTEN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">2839</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>memcached      </li><li style="list-style:none outside;">tcp&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span>&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:::</span><span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">11211</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:::*</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LISTEN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">2839</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>memcached      </li><li style="list-style:none outside;">udp&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span>&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0.0.0.0</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:</span><span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">11211</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0.0.0.0</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:*</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">2839</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>memcached      </li><li style="list-style:none outside;">udp&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span>&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:::</span><span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">11211</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:::*</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">2839</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>memcached</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># setenforce <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span></li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># firewall<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>cmd <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">--</span>set<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span><span class="sh_keyword" style="color:rgb(187,121,119);font-weight:bold;">default</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>zone<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span>trusted</li></ol></div></div><p class="number" style="text-indent:21pt;font-size:15px;font-weight:bold;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">步骤二:使用telnet访问memcached服务器</p><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">1)使用yum安装telnet</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install telnet</li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">2)使用telnet连接服务器测试memcached服务器功能,包括增、删、改、查等操作。</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># telnet  <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">192.168.4.5</span>  <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">11211</span></li><li style="list-style:none outside;">Trying <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">192.168.4.5</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">...</span></li><li style="list-style:none outside;">……</li><li style="list-style:none outside;">set name <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">180</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">3</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//定义变量,变量名称为name</span></li><li style="list-style:none outside;">plj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//输入变量的值,值为plj                </span></li><li style="list-style:none outside;">STORED</li><li style="list-style:none outside;">get name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//获取变量的值</span></li><li style="list-style:none outside;">VALUE name <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">3</span>     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//输出结果</span></li><li style="list-style:none outside;">plj</li><li style="list-style:none outside;">END</li><li style="list-style:none outside;">add myname <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">180</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">10</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//新建,myname不存在则添加,存在则报错</span></li><li style="list-style:none outside;">set myname <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">180</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">10</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//添加或替换变量</span></li><li style="list-style:none outside;">replace myname <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">180</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">10</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//替换,如果myname不存在则报错</span></li><li style="list-style:none outside;">get myname&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//读取变量</span></li><li style="list-style:none outside;">append myname <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">0</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">180</span> <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">10</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//向变量中追加数据</span></li><li style="list-style:none outside;"><span class="sh_keyword" style="color:rgb(187,121,119);font-weight:bold;">delete</span> myname&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//删除变量</span></li><li style="list-style:none outside;">stats&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//查看状态</span></li><li style="list-style:none outside;">flush_all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//清空所有</span></li><li style="list-style:none outside;">quit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//退出登录  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></li></ol></div></div><a style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;" target="_blank"></a><span style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"></span><h2 style="font-size:20px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';"><a name="t6"></a>2 案例2:LNMP+memcached</h2><h3 style="font-size:18px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';"><a name="t7"></a>2.1 问题</h3><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">沿用练习一,部署LNMP+memcached网站平台,通过PHP页面实现对memcached服务器的数据操作,实现以下目标:</p><ol class="list" style="margin-left:30px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><li>部署LNMP实现PHP动态网站架构</li><li>为PHP安装memcache扩展</li><li>创建PHP页面,并编写PHP代码,实现对memcached的数据操作</li></ol><h3 style="font-size:18px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';"><a name="t8"></a>2.2 方案</h3><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">使用2台RHEL7虚拟机,其中一台作为memcached及LNMP服务器(192.168.4.5)、另外一台作为测试用的Linux客户机(192.168.4.100),如图-1所示。</p><div class="image" style="text-align:center;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;">]<img src="https://img-blog.****.net/20180626090744178?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NDQxMDI3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt=""><p style="text-indent:21pt;font-size:12px;text-align:center;">图-1</p></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">在RHEL7系统光盘中包含有我们需要的MariaDB、PHP,我们需要使用源码安装Nginx,使用RPM包安装FPM。另外如果希望使用PHP来操作memcached,注意必须要为PHP安装memcache扩展(php-pecl-memcache),否则PHP无法解析连接memcached的指令。客户端测试时需要提前安装telnet远程工具。</p><h3 style="font-size:18px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';"><a name="t9"></a>2.3 步骤</h3><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">实现此案例需要按照如下步骤进行。</p><p class="number" style="text-indent:21pt;font-size:15px;font-weight:bold;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">步骤一:部署LNMP环境(如果环境中已经存在LNMP环境本步骤可以忽略)</p><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">1)使用yum安装基础依赖包</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install gcc openssl<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>devel pcre<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>devel zlib<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>devel</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">..</span> <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">..</span></li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">2)源码安装Nginx</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># tar <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>xf nginx<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">-1.12.2</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>tar<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>gz</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># cd nginx<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">-1.12.2</span></li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] nginx<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">-1.12.2</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">]</span>#  <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">./</span>configure   <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">\</span></li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">&gt;</span> <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">--</span><span class="sh_keyword" style="color:rgb(187,121,119);font-weight:bold;">with</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>http_ssl_module </li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] nginx<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">-1.12.2</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">]</span># make <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">&amp;&amp;</span> make install</li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">3)安装MariaDB数据库</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install  mariadb  mariadb<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>server  mariadb<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>devel</li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">4)安装PHP</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install  php  php<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>mysql</li><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install  php<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>fpm<span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">-5.4.16-42</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>el7<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>x86_64<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>rpm</li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">5)为PHP添加memcache扩展</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># yum <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>y install  php<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>pecl<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-</span>memcache</li></ol></div></div><p style="text-indent:21pt;font-size:15px;color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';">6)修改Nginx配置文件</p><div class="snippet-container" style="color:rgb(0,0,0);font-family:'微软雅黑', 'Times New Roman';font-size:14px;"><div class="sh_acid snippet-wrap" style="background-image:none;border:0px none;"><ol class="snippet-num" style="margin-left:1em;"><li style="list-style:none outside;"><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">[</span>[email protected] <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~]</span># <span class="sh_normal">vim </span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">usr</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">local</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">nginx</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span><span class="sh_normal">conf</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span>nginx<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>conf</li><li style="list-style:none outside;"><span class="sh_normal">location </span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">/</span> <span class="sh_cbracket" style="color:rgb(255,0,128);font-weight:bold;">{</span></li><li style="list-style:none outside;">            root   html<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span></li><li style="list-style:none outside;">            index  index<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>php  index<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>html   index<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>htm<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span></li><li style="list-style:none outside;">        <span class="sh_cbracket" style="color:rgb(255,0,128);font-weight:bold;">}</span></li><li style="list-style:none outside;"> location  <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">~</span>  <span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">\.</span>php {
  3. root html;
  4. fastcgi_pass 127.0.0.1:9000;
  5. fastcgi_index index.php;
  6. # fastcgi_param SCRIPT_FILENAME documentrootfastcgi_script_name;
  7. include fastcgi.conf;
  8. }

步骤二:启动服务

1)启动Nginx服务

这里需要注意的是,如果服务器上已经启动了其他监听80端口的服务软件(如httpd),则需要先关闭该服务,否则会出现冲突。

  1. [[email protected] ~]# systemctl stop httpd                //如果该服务存在,则关闭该服务
  2. [[email protected] ~]# /usr/local/nginx/sbin/nginx
  3. [[email protected] ~]# netstat -utnlp | grep :80
  4. tcp    0    0 0.0.0.0:80        0.0.0.0:*        LISTEN        32428/nginx

2)启动MySQL服务

  1. [[email protected] ~]# systemctl start mariadb
  2. [[email protected] ~]# systemctl status mariadb

3)启动PHP-FPM服务

  1. [[email protected] ~]# systemctl start php-fpm
  2. [[email protected] ~]# systemctl status php-fpm

4)关闭SELinux、防火墙

  1. [[email protected] ~]# setenforce 0
  2. [[email protected] ~]# firewall-cmd set-default-zone=trusted

步骤三:创建PHP页面,使用PHP语言测试memcached服务

创建PHP首页文档/usr/local/nginx/html/index.php,测试页面可以参考lnmp_soft/php_scripts/mem.php:

  1. [[email protected] ~]# vim /usr/local/nginx/html/test.php
  2. <?php
  3. memcache<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">=</span><span class="sh_keyword" style="color:rgb(187,121,119);font-weight:bold;">new</span> Memcache<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//创建memcache对象</span></li><li style="list-style:none outside;">memcache->connect(‘localhost’,11211) or die (‘could not connect!!’);
  4. memcache<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-&gt;</span><span class="sh_function" style="color:rgb(0,68,102);">set</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">(</span><span class="sh_string" style="color:rgb(166,133,0);">'key'</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">,</span><span class="sh_string" style="color:rgb(166,133,0);">'test'</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">);</span>    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="sh_comment" style="color:rgb(255,128,0);">//定义变量</span></li><li style="list-style:none outside;">get_values=memcache<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">-&gt;</span><span class="sh_function" style="color:rgb(0,68,102);">get</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">(</span><span class="sh_string" style="color:rgb(166,133,0);">'key'</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">);</span>    &nbsp;&nbsp;&nbsp;&nbsp;<span class="sh_comment" style="color:rgb(255,128,0);">//获取变量值</span></li><li style="list-style:none outside;">echoget_values;
  5. ?>

步骤四:客户端测试

客户端使用浏览器访问服务器PHP首页文档,检验对memcached的操作是否成功:

  1. [[email protected] ~]# firefox http://192.168.4.5/test.php

3 案例3:PHP的本地Session信息

3.1 问题

通过Nginx调度器负载后端两台Web服务器,实现以下目标:

  1. 部署Nginx为前台调度服务器
  2. 调度算法设置为轮询
  3. 后端为两台LNMP服务器
  4. 部署测试页面,查看PHP本地的Session信息

3.2 方案

使用4台RHEL7虚拟机,其中一台作为Nginx前端调度器服务器(eth0:192.168.4.5,eth1:172.16.2.5)、两台虚拟机部署为LNMP服务器,分别为Web1服务器(192.168.2.100)和Web2服务器(192.168.2.200),另外一台作为测试用的Linux客户机(172.16.4.100),拓扑如图-2所示。

OPERATION04 - memcached原理 部署memcached、Session共享

图-2

3.3 步骤

实现此案例需要按照如下步骤进行。

步骤一:部署后端LNMP服务器相关软件

注意:以下部署LNMP服务器的操作,需要在两台后端服务器做相同的操作,下面我们以一台Web1服务器(192.168.2.100)为例,对Web2服务器执行相同操作即可。

1)使用yum安装基础依赖包

  1. [[email protected] ~]# yum -y install gcc openssl-devel pcre-devel zlib-devel
  2. .. ..

2)源码安装Nginx

  1. [[email protected] ~]# tar -xf nginx-1.12.2.tar.gz
  2. [[email protected] ~]# cd nginx-1.12.2
  3. [[email protected] nginx-1.12.2]# ./configure \
  4. > with-http_ssl_module
  5. [[email protected] nginx-1.12.2]# make && make install

3)安装MariaDB数据库

  1. [[email protected] ~]# yum -y install mariadb mariadb-server mariadb-devel

4)安装PHP

  1. [[email protected] ~]# yum -y install php php-mysql
  2. [[email protected] ~]# yum -y install php-fpm-5.4.16-42.el7.x86_64.rpm

5)修改Nginx配置文件(修改默认首页与动静分离)

  1. [[email protected] ~]# vim /usr/local/nginx/conf/nginx.conf
  2. location / {
  3. root html;
  4. index index.php index.html index.htm;
  5. }
  6. location ~ \.php<span class="sh_cbracket" style="color:rgb(255,0,128);font-weight:bold;">{</span></li><li style="list-style:none outside;">            root           html<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span></li><li style="list-style:none outside;">            fastcgi_pass   <span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">127.0.0.1</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">:</span><span class="sh_number" style="color:rgb(128,0,128);font-weight:bold;">9000</span><span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span></li><li style="list-style:none outside;">            fastcgi_index  index<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">.</span>php<span class="sh_symbol" style="color:rgb(255,0,128);font-weight:bold;">;</span></li><li style="list-style:none outside;">           # fastcgi_param   SCRIPT_FILENAMEdocument_root$fastcgi_script_name;
  7. include fastcgi.conf;
  8. }

步骤二:启动LNMP服务器相关的服务

1)启动Nginx服务

这里需要注意的是,如果服务器上已经启动了其他监听80端口的服务软件(如httpd),则需要先关闭该服务,否则会出现冲突。

  1. [[email protected] ~]# systemctl stop httpd                //如果该服务存在,则关闭该服务
  2. [[email protected] ~]# /usr/local/nginx/sbin/nginx
  3. [[email protected] ~]# netstat -utnlp | grep :80
  4. tcp    0    0 0.0.0.0:80        0.0.0.0:*        LISTEN        32428/nginx

2)启动MySQL服务

  1. [[email protected] ~]# systemctl start mariadb
  2. [[email protected] ~]# systemctl status mariadb

3)启动PHP-FPM服务

  1. [[email protected] ~]# systemctl start php-fpm
  2. [[email protected] ~]# systemctl status php-fpm

4)关闭SELinux、防火墙

  1. [[email protected] ~]# setenforce 0
  2. [[email protected] ~]# firewall-cmd set-default-zone=trusted

步骤三:部署前端Nginx调度服务器

1)使用源码安装nginx软件(如果Nginx软件包已存在可以忽略此步骤)

  1. [[email protected] ~]# yum -y install pcre-devel openssl-devel
  2. [[email protected] ~]# tar -xf nginx-1.12.2.tar.gz
  3. [[email protected] ~]# cd nginx-1.12.2
  4. [[email protected] nginx-1.12.2]# ./configure
  5. [[email protected] nginx-1.12.2]# make && make install

2)修改Nginx配置文件

Nginx配置文件中,通过upstream定义后端服务器地址池,默认调度策略为轮询,使用proxy_pass调用upstream定义的服务器地址池:

  1. [[email protected] ~]# vim /usr/local/nginx/conf/nginx.conf
  2. .. ..
  3. upstream webs {
  4. server 192.168.2.100:80;
  5. server 192.168.2.200:80;
  6. }
  7. server {
  8. listen 80;
  9. server_name localhost;
  10. location / {
  11.              proxy_pass http://webs;
  12. root html;
  13. index index.html index.htm;
  14. }
  15. }

3)重新加载配置文件

  1. [[email protected] ~]# /usr/local/nginx/sbin/nginx -s reload

4)关闭SELinux、防火墙

  1. [[email protected] ~]# setenforce 0
  2. [[email protected] ~]# firewall-cmd set-default-zone=trusted

步骤四:测试环境是否配置成功

1)浏览器访问测试页面验证。

  1. [[email protected] ~]# curl http://192.168.4.5/index.html        //查看是否有数据

步骤五:部署测试页面

1)部署测试页面(Web1服务器)。

测试页面可以参考lnmp_soft/php_scripts/php-memcached-demo.tar.gz。

  1. [[email protected] ~]# cd lnmp_soft/php_scripts/
  2. [[email protected] php_scripts]# tar -xf php-memcached-demo.tar.gz
  3. [[email protected] php_scripts]# cd php-memcached-demo
  4. [[email protected] php-memcached-demo]# cp -a * /usr/local/nginx/html/

2)浏览器直接访问后端服务器的测试页面(Web1服务器)。

  1. [[email protected] ~]# firefox http://192.168.2.100            //填写账户信息
  2. [[email protected] ~]# cd /var/lib/php/session/            //查看服务器本地的Session信息
  3. [[email protected] ~]# ls
  4. sess_ahilcq9bguot0vqsjtd84k7244                        //注意这里的ID是随机的
  5. [[email protected] ~]# cat sess_ahilcq9bguot0vqsjtd84k7244

注意:可用修改index.html和home.html两个文件的内容,添加页面颜色属性,以区别后端两台不同的服务器:<body bgcolor=blue>。

3)部署测试页面(Web2服务器)。

测试页面可以参考lnmp_soft/php_scripts/php-memcached-demo.tar.gz。

  1. [[email protected] ~]# cd lnmp_soft/php_scripts/
  2. [[email protected] php_scripts]# tar -xf php-memcached-demo.tar.gz
  3. [[email protected] php_scripts]# cd php-memcached-demo
  4. [[email protected] php-memcached-demo]# cp -a * /usr/local/nginx/html/

4)浏览器直接访问后端服务器的测试页面(Web2服务器)。

  1. [[email protected] ~]# firefox http://192.168.2.100        //填写账户信息
  2. [[email protected] ~]# cd /var/lib/php/session/            //查看服务器本地的Session信息
  3. [[email protected] ~]# ls
  4. sess_qqek1tmel07br8f63d6v9ch401                        //注意这里的ID是随机的
  5. [[email protected] ~]# cat sess_qqek1tmel07br8f63d6v9ch401    

注意:可用修改index.html和home.html两个文件的内容,添加页面颜色属性,以区别后端两台不同的服务器:<body bgcolor=green>。

5)浏览器访问前端调度器测试(不同后端服务器Session不一致)。

  1. [[email protected] ~]# firefox http://192.168.4.5
  2. //填写注册信息后,刷新,还需要再次注册,说明两台计算机使用的是本地Session
  3. //第二台主机并不知道你再第一台主机已经登录,第一台主机的登录信息也没有传递给第二台主机

4 案例4:PHP实现session共享

4.1 问题

沿用练习三,通过修改PHP-FPM配置文件,实现session会话共享,本案例需要在练习三的基础上实现:

  • 配置PHP使用memcached服务器共享Session信息
  • 客户端访问两台不同的后端Web服务器时,Session 信息一致

4.2 方案

在练习三拓扑的基础上,Nginx服务器除了承担调度器外,还需要担任memcached数据库的角色,并在两台后端LNMP服务器上实现PHP的session会话共享。拓扑结构如图-4所示。

OPERATION04 - memcached原理 部署memcached、Session共享

图-4

4.3 步骤

实现此案例需要按照如下步骤进行。

步骤一:构建memcached服务

1)安装Memcached服务(如果192.168.4.5上已经有本软件包,此步骤可以忽略)

  1. [[email protected] ~]# yum -y install memcached

5)为PHP添加memcache扩展

  1. [[email protected] ~]# yum -y install php-pecl-memcache

2)启动服务并查看网络连接状态验证是否开启成功:

  1. [[email protected] ~]# systemctl restart memcached
  2. [[email protected] ~]# netstat -anptu | grep memcached
  3. tcp    0    0 0.0.0.0:11211        0.0.0.0:*        LISTEN        2839/memcached
  4. tcp    0    0 :::11211            :::*                LISTEN        2839/memcached
  5. udp    0    0 0.0.0.0:11211        0.0.0.0:*                    2839/memcached
  6. udp    0    0 :::11211            :::*                            2839/memcached

3)关闭SELinux、防火墙

  1. [[email protected] ~]# setenforce 0
  2. [[email protected] ~]# firewall-cmd set-default-zone=trusted

步骤二:在后端LNMP服务器上部署Session共享

注意:这些操作在两台后端Web服务器上均需要执行,以下操作以Web1(192.168.2.100)服务器为例。

1)修改PHP-FPM配置文件,并重启服务

  1. [[email protected] ~]# vim /etc/php-fpm.d/www.conf            //修改该配置文件的两个参数
  2. //文件的最后2行
  3. 修改前效果如下:
  4. php_value[session.save_handler] = files
  5. php_value[session.save_path] = /var/lib/php/session
  6. //原始文件,默认定义Sessoin会话信息本地计算机(默认在/var/lib/php/session)
  7. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  8. 修改后效果如下:
  9. php_value[session.save_handler] = memcache
  10. php_value[session.save_path] = “tcp://192.168.2.5:11211”
  11. //定义Session信息存储在公共的memcached服务器上,主机参数中为memcache(没有d)
  12. //通过path参数定义公共的memcached服务器在哪(服务器的IP和端口)
  13. [[email protected] ~]# systemctl restart php-fpm

步骤三:客户端测试

客户端使用浏览器访问两台不同的Web服务器。

操作步骤与练习三一致,最终可以获得相关的Session ID信息。