负载均衡中使用Redis实现共享Session
文章目录
一、负载均衡
负载均衡：把众多的访问量分担到其他的服务器上，让每个服务器的压力减少。
通俗的解释就是：把一项任务交由一个开发人员处理总会有上限处理能力，这时可以考虑增加开发人员来共同处理这项任务，多人处理同一项任务时就会涉及到调度问题，即任务分配，这和多线程理念是一致的。nginx在这里的角色相当于任务分配者。
如我们第一次访问 www.baidu.com 这个域名，可能会对应这个IP 111.13.101.208的服务器，然后第二次访问，IP可能会变为111.13.101.209的服务器，这就是百度采用了负载均衡，一个域名对应多个服务器，将访问量分担到其他的服务器，这样很大程度的减轻了每个服务器上访问量。
但是，这里有一个问题，如果我们登录了百度的一个账号，如网页的百度网盘，但是每次有可能请求的是不同的服务器，我们知道每个服务器都会有自己的会话session，所以会导致用户每次刷新网页又要重新登录，这是非常糟糕的体验，因此，根据以上问题，希望session可以共享，这样就可以解决负载均衡中同一个域名不同服务器对应不同session的问题。
二、Redis介绍
目前多服务器的共享session，用的最多的是redis。
关于Redis的基础知识，可以看我之前的博文Redis开发学习。
再简单的梳理下：
- redis是key-value的存储系统，属于非关系型数据库
- 特点：支持数据持久化，可以让数据在内存中保存到磁盘里（memcached：数据存在内存里，如果服务重启，数据会丢失）
- 支持5种数据类型：string，hash，list，set，zset
- 两种文件格式（即数据持久化）
（1）RDB（全量数据）：多长时间/频率，把内存中的数据刷到磁盘中，便于下次读取文件时进行加载。（2）AOF（增量请求）：类似mysql的二进制日志，不停地把对数据库的更改语句记录到日志中，下次重启服务，会根据二进制日志把数据重写一次，加载到内存里，实现数据持久化 - 存储
（1）内存存储 （2）磁盘存储（RDB） （3）log文件（AOF）
三、实现的核心思想
首先要明确session和cookie的区别。浏览器端存的是cookie每次浏览器发请求到服务端是http 报文头是会自动加上你的cookie信息的。服务端拿着用户的cookie作为key去存储里找对应的value(session).
同一域名下的网站的cookie都是一样的。所以无论几台服务器,无论请求分配到哪一台服务器上同一用户的cookie是不变的。也就是说cookie对应的session也是唯一的。
所以，这里只要保证多台业务服务器访问同一个redis服务器(或集群)就行了。
四、PHP会话session配置改为Redis
我们可以看到PHP默认的的session配置使用文件形式保存在服务器临时目录中，我们需要Redis作为保存session的驱动，所以，这里需要对配置文件进行修改，PHP的自定义会话机制改为Redis。
这里有三种修改方式：
1.修改配置文件php.ini
找到配置文件 php.ini，修改为下面内容，保存并重启服务
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<span class="hljs-attr">session.save_handler</span> = redis <span class="hljs-attr">session.save_path</span> = <span class="hljs-string">"tcp://127.0.0.1:6379"</span> |
2.代码中动态配置修改
直接在代码中加入以下内容：
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ini_set(<span class="hljs-string">"session.save_handler"</span>, <span class="hljs-string">"redis"</span>)<span class="hljs-comment">;</span> ini_set(<span class="hljs-string">"session.save_path"</span>, <span class="hljs-string">"tcp://127.0.0.1:6379"</span>)<span class="hljs-comment">;</span> |
注：如果配置文件redis.conf里设置了连接密码requirepass，save_path需要这样写tcp://127.0.0.1:6379?auth=authpwd ，否则保存session的时候会报错。
测试：
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<span class="hljs-meta"><?php</span> <span class="hljs-comment">//ini_set("session.save_handler", "redis");</span> <span class="hljs-comment">//ini_set("session.save_path", "tcp://127.0.0.1:6379");</span> <span class="hljs-title function_ invoke__">session_start</span>(); <span class="hljs-comment">//存入session</span> <span class="hljs-variable">$_SESSION</span>[<span class="hljs-string">'class'</span>] = <span class="hljs-keyword">array</span>(<span class="hljs-string">'name'</span> => <span class="hljs-string">'toefl'</span>, <span class="hljs-string">'num'</span> => <span class="hljs-number">8</span>); <span class="hljs-comment">//连接redis</span> <span class="hljs-variable">$redis</span> = <span class="hljs-keyword">new</span> <span class="hljs-title class_">redis</span>(); <span class="hljs-variable">$redis</span>-><span class="hljs-title function_ invoke__">connect</span>(<span class="hljs-string">'127.0.0.1'</span>, <span class="hljs-number">6379</span>); <span class="hljs-comment">//检查session_id</span> <span class="hljs-keyword">echo</span> <span class="hljs-string">'session_id:'</span> . <span class="hljs-title function_ invoke__">session_id</span>() . <span class="hljs-string">'<br/>'</span>; <span class="hljs-comment">//redis存入的session（redis用session_id作为key,以string的形式存储）</span> <span class="hljs-keyword">echo</span> <span class="hljs-string">'redis_session:'</span> . <span class="hljs-variable">$redis</span>-><span class="hljs-title function_ invoke__">get</span>(<span class="hljs-string">'PHPREDIS_SESSION:'</span> . <span class="hljs-title function_ invoke__">session_id</span>()) . <span class="hljs-string">'<br/>'</span>; <span class="hljs-comment">//php获取session值</span> <span class="hljs-keyword">echo</span> <span class="hljs-string">'php_session:'</span> . <span class="hljs-title function_ invoke__">json_encode</span>(<span class="hljs-variable">$_SESSION</span>[<span class="hljs-string">'class'</span>]); |
3.自定义会话机制
使用 session_set_save_handle 方法自定义会话机制，网上发现了一个封装非常好的类，我们可以直接使用这个类来实现我们的共享session操作。
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<span class="hljs-meta"><?php</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">redisSession</span></span>{ <span class="hljs-comment">/** * 保存session的数据库表的信息 */</span> <span class="hljs-keyword">private</span> <span class="hljs-variable">$_options</span> = <span class="hljs-keyword">array</span>( <span class="hljs-string">'handler'</span> => <span class="hljs-literal">null</span>, <span class="hljs-comment">//数据库连接句柄</span> <span class="hljs-string">'host'</span> => <span class="hljs-literal">null</span>, <span class="hljs-string">'port'</span> => <span class="hljs-literal">null</span>, <span class="hljs-string">'lifeTime'</span> => <span class="hljs-literal">null</span>, <span class="hljs-string">'prefix'</span> => <span class="hljs-string">'PHPREDIS_SESSION:'</span> ); <span class="hljs-comment">/** * 构造函数 * <span class="hljs-doctag">@param</span> $options 设置信息数组 */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">__construct</span>(<span class="hljs-params"><span class="hljs-variable">$options</span>=<span class="hljs-keyword">array</span>()</span>)</span>{ <span class="hljs-keyword">if</span>(!<span class="hljs-title function_ invoke__">class_exists</span>(<span class="hljs-string">"redis"</span>, <span class="hljs-literal">false</span>)){ <span class="hljs-keyword">die</span>(<span class="hljs-string">"必须安装redis扩展"</span>); } <span class="hljs-keyword">if</span>(!<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$options</span>[<span class="hljs-string">'lifeTime'</span>]) || <span class="hljs-variable">$options</span>[<span class="hljs-string">'lifeTime'</span>] <= <span class="hljs-number">0</span>){ <span class="hljs-variable">$options</span>[<span class="hljs-string">'lifeTime'</span>] = <span class="hljs-title function_ invoke__">ini_get</span>(<span class="hljs-string">'session.gc_maxlifetime'</span>); } <span class="hljs-variable language_">$this</span>->_options = <span class="hljs-title function_ invoke__">array_merge</span>(<span class="hljs-variable language_">$this</span>->_options, <span class="hljs-variable">$options</span>); } <span class="hljs-comment">/** * 开始使用该驱动的session */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">begin</span>()</span>{ <span class="hljs-keyword">if</span>(<span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'host'</span>] === <span class="hljs-literal">null</span> || <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'port'</span>] === <span class="hljs-literal">null</span> || <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'lifeTime'</span>] === <span class="hljs-literal">null</span> ){ <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>; } <span class="hljs-comment">//设置session处理函数</span> <span class="hljs-title function_ invoke__">session_set_save_handler</span>( <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'open'</span>), <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'close'</span>), <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'read'</span>), <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'write'</span>), <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'destory'</span>), <span class="hljs-keyword">array</span>(<span class="hljs-variable language_">$this</span>, <span class="hljs-string">'gc'</span>) ); } <span class="hljs-comment">/** * 自动开始回话或者session_start()开始回话后第一个调用的函数 * 类似于构造函数的作用 * <span class="hljs-doctag">@param</span> $savePath 默认的保存路径 * <span class="hljs-doctag">@param</span> $sessionName 默认的参数名，PHPSESSID */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">open</span>(<span class="hljs-params"><span class="hljs-variable">$savePath</span>, <span class="hljs-variable">$sessionName</span></span>)</span>{ <span class="hljs-keyword">if</span>(<span class="hljs-title function_ invoke__">is_resource</span>(<span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>])) <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>; <span class="hljs-comment">//连接redis</span> <span class="hljs-variable">$redisHandle</span> = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Redis</span>(); <span class="hljs-variable">$redisHandle</span>-><span class="hljs-title function_ invoke__">connect</span>(<span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'host'</span>], <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'port'</span>]); <span class="hljs-keyword">if</span>(!<span class="hljs-variable">$redisHandle</span>){ <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>; } <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>] = <span class="hljs-variable">$redisHandle</span>; <span class="hljs-comment">// $this->gc(null);</span> <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>; } <span class="hljs-comment">/** * 类似于析构函数，在write之后调用或者session_write_close()函数之后调用 */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">close</span>()</span>{ <span class="hljs-keyword">return</span> <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>]-><span class="hljs-title function_ invoke__">close</span>(); } <span class="hljs-comment">/** * 读取session信息 * <span class="hljs-doctag">@param</span> $sessionId 通过该Id唯一确定对应的session数据 * <span class="hljs-doctag">@return</span> session信息/空串 */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">read</span>(<span class="hljs-params"><span class="hljs-variable">$sessionId</span></span>)</span>{ <span class="hljs-variable">$sessionId</span> = <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'prefix'</span>].<span class="hljs-variable">$sessionId</span>; <span class="hljs-keyword">return</span> <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>]-><span class="hljs-title function_ invoke__">get</span>(<span class="hljs-variable">$sessionId</span>); } <span class="hljs-comment">/** * 写入或者修改session数据 * <span class="hljs-doctag">@param</span> $sessionId 要写入数据的session对应的id * <span class="hljs-doctag">@param</span> $sessionData 要写入的数据，已经序列化过了 */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">write</span>(<span class="hljs-params"><span class="hljs-variable">$sessionId</span>, <span class="hljs-variable">$sessionData</span></span>)</span>{ <span class="hljs-variable">$sessionId</span> = <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'prefix'</span>].<span class="hljs-variable">$sessionId</span>; <span class="hljs-keyword">return</span> <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>]-><span class="hljs-title function_ invoke__">setex</span>(<span class="hljs-variable">$sessionId</span>, <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'lifeTime'</span>], <span class="hljs-variable">$sessionData</span>); } <span class="hljs-comment">/** * 主动销毁session会话 * <span class="hljs-doctag">@param</span> $sessionId 要销毁的会话的唯一id */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">destory</span>(<span class="hljs-params"><span class="hljs-variable">$sessionId</span></span>)</span>{ <span class="hljs-variable">$sessionId</span> = <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'prefix'</span>].<span class="hljs-variable">$sessionId</span>; <span class="hljs-comment">// $array = $this->print_stack_trace();</span> <span class="hljs-comment">// log::write($array);</span> <span class="hljs-keyword">return</span> <span class="hljs-variable language_">$this</span>->_options[<span class="hljs-string">'handler'</span>]-><span class="hljs-title function_ invoke__">delete</span>(<span class="hljs-variable">$sessionId</span>) >= <span class="hljs-number">1</span> ? <span class="hljs-literal">true</span> : <span class="hljs-literal">false</span>; } <span class="hljs-comment">/** * 清理绘画中的过期数据 * <span class="hljs-doctag">@param</span> 有效期 */</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">gc</span>(<span class="hljs-params"><span class="hljs-variable">$lifeTime</span></span>)</span>{ <span class="hljs-comment">//获取所有sessionid，让过期的释放掉</span> <span class="hljs-comment">//$this->_options['handler']->keys("*");</span> <span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>; } <span class="hljs-comment">//打印堆栈信息</span> <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">print_stack_trace</span>() </span>{ <span class="hljs-variable">$array</span> = <span class="hljs-title function_ invoke__">debug_backtrace</span> (); <span class="hljs-comment">//截取用户信息</span> <span class="hljs-variable">$var</span> = <span class="hljs-variable language_">$this</span>-><span class="hljs-title function_ invoke__">read</span>(<span class="hljs-title function_ invoke__">session_id</span>()); <span class="hljs-variable">$s</span> = <span class="hljs-title function_ invoke__">strpos</span>(<span class="hljs-variable">$var</span>, <span class="hljs-string">"index_dk_user|"</span>); <span class="hljs-variable">$e</span> = <span class="hljs-title function_ invoke__">strpos</span>(<span class="hljs-variable">$var</span>, <span class="hljs-string">"}authId|"</span>); <span class="hljs-variable">$user</span> = <span class="hljs-title function_ invoke__">substr</span>(<span class="hljs-variable">$var</span>,<span class="hljs-variable">$s</span>+<span class="hljs-number">14</span>,<span class="hljs-variable">$e</span>-<span class="hljs-number">13</span>); <span class="hljs-variable">$user</span> = <span class="hljs-title function_ invoke__">unserialize</span>(<span class="hljs-variable">$user</span>); <span class="hljs-comment">//print_r($array);//信息很齐全</span> <span class="hljs-keyword">unset</span> ( <span class="hljs-variable">$array</span> [<span class="hljs-number">0</span>] ); <span class="hljs-keyword">if</span>(!<span class="hljs-keyword">empty</span>(<span class="hljs-variable">$user</span>)){ <span class="hljs-variable">$traceInfo</span> = <span class="hljs-variable">$user</span>[<span class="hljs-string">'id'</span>].<span class="hljs-string">'|'</span>.<span class="hljs-variable">$user</span>[<span class="hljs-string">'user_name'</span>].<span class="hljs-string">'|'</span>.<span class="hljs-variable">$user</span>[<span class="hljs-string">'user_phone'</span>].<span class="hljs-string">'|'</span>.<span class="hljs-variable">$user</span>[<span class="hljs-string">'presona_name'</span>].<span class="hljs-string">'++++++++++++++++\n'</span>; }<span class="hljs-keyword">else</span>{ <span class="hljs-variable">$traceInfo</span> = <span class="hljs-string">'++++++++++++++++\n'</span>; } <span class="hljs-variable">$time</span> = <span class="hljs-title function_ invoke__">date</span> ( <span class="hljs-string">"y-m-d H:i:m"</span> ); <span class="hljs-keyword">foreach</span> ( <span class="hljs-variable">$array</span> <span class="hljs-keyword">as</span> <span class="hljs-variable">$t</span> ) { <span class="hljs-variable">$traceInfo</span> .= <span class="hljs-string">'['</span> . <span class="hljs-variable">$time</span> . <span class="hljs-string">'] '</span> . <span class="hljs-variable">$t</span> [<span class="hljs-string">'file'</span>] . <span class="hljs-string">' ('</span> . <span class="hljs-variable">$t</span> [<span class="hljs-string">'line'</span>] . <span class="hljs-string">') '</span>; <span class="hljs-variable">$traceInfo</span> .= <span class="hljs-variable">$t</span> [<span class="hljs-string">'class'</span>] . <span class="hljs-variable">$t</span> [<span class="hljs-string">'type'</span>] . <span class="hljs-variable">$t</span> [<span class="hljs-string">'function'</span>] . <span class="hljs-string">'('</span>; <span class="hljs-variable">$traceInfo</span> .= <span class="hljs-title function_ invoke__">implode</span> ( <span class="hljs-string">', '</span>, <span class="hljs-variable">$t</span> [<span class="hljs-string">'args'</span>] ); <span class="hljs-variable">$traceInfo</span> .= <span class="hljs-string">")\n"</span>; } <span class="hljs-variable">$traceInfo</span> .= <span class="hljs-string">'++++++++++++++++'</span>; <span class="hljs-keyword">return</span> <span class="hljs-variable">$traceInfo</span>; } } |
在你的项目入口处调用上边的类：
上边的方法等于是重写了session写入文件的方法，将数据写入到了Redis中。
初始化文件 init.php
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<span class="hljs-meta"><?php</span> <span class="hljs-keyword">require_once</span>(<span class="hljs-string">"redisSession.php"</span>); <span class="hljs-variable">$handler</span> = <span class="hljs-keyword">new</span> <span class="hljs-title class_">redisSession</span>(<span class="hljs-keyword">array</span>( <span class="hljs-string">'host'</span> => <span class="hljs-string">"127.0.0.1"</span>, <span class="hljs-string">'port'</span> => <span class="hljs-string">"6379"</span> )); <span class="hljs-variable">$handler</span>-><span class="hljs-title function_ invoke__">begin</span>(); <span class="hljs-comment">// 这也是必须的，打开session，必须在session_set_save_handler后面执行</span> <span class="hljs-title function_ invoke__">session_start</span>(); |
测试 test.php
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<span class="hljs-meta"><?php</span> <span class="hljs-comment">// 引入初始化文件</span> <span class="hljs-keyword">include</span>(<span class="hljs-string">"init.php"</span>); <span class="hljs-variable">$_SESSION</span>[<span class="hljs-string">'isex'</span>] = <span class="hljs-string">"Hello"</span>; <span class="hljs-variable">$_SESSION</span>[<span class="hljs-string">'sex'</span>] = <span class="hljs-string">"Corwien"</span>; <span class="hljs-comment">// 打印文件</span> <span class="hljs-title function_ invoke__">print_r</span>(<span class="hljs-variable">$_SESSION</span>); <span class="hljs-comment">// ( [sex] => Corwien [isex] => Hello )</span> |
在Redis客户端使用命令查看我们的这条数据是否存在：
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<span class="hljs-number">27.0</span>.<span class="hljs-number">0.1</span>:<span class="hljs-number">6379</span><span class="hljs-operator">></span> keys <span class="hljs-operator">*</span> <span class="hljs-number">1</span>) <span class="hljs-string">"first_key"</span> <span class="hljs-number">2</span>) <span class="hljs-string">"mylist"</span> <span class="hljs-number">3</span>) <span class="hljs-string">"language"</span> <span class="hljs-number">4</span>) <span class="hljs-string">"mytest"</span> <span class="hljs-number">5</span>) <span class="hljs-string">"pragmmer"</span> <span class="hljs-number">6</span>) <span class="hljs-string">"good"</span> <span class="hljs-number">7</span>) <span class="hljs-string">"PHPREDIS_SESSION:29a111bcs120sv48ibmmjqdag4"</span> <span class="hljs-number">8</span>) <span class="hljs-string">"user:1"</span> <span class="hljs-number">9</span>) <span class="hljs-string">"counter:__rand_int__"</span> <span class="hljs-number">10</span>) <span class="hljs-string">"key:__rand_int__"</span> <span class="hljs-number">11</span>) <span class="hljs-string">"tutorial-list"</span> <span class="hljs-number">12</span>) <span class="hljs-string">"id:1"</span> <span class="hljs-number">13</span>) <span class="hljs-string">"name"</span> <span class="hljs-number">127.0</span>.<span class="hljs-number">0.1</span>:<span class="hljs-number">6379</span><span class="hljs-operator">></span> <span class="hljs-keyword">get</span> <span class="hljs-type">PHPREDIS_SESSION</span>:29a111bcs120sv48ibmmjqdag4 <span class="hljs-string">"sex|s:7:<span class="hljs-subst">\"</span>Corwien<span class="hljs-subst">\"</span>;isex|s:5:<span class="hljs-subst">\"</span>Hello<span class="hljs-subst">\"</span>;"</span> <span class="hljs-number">127.0</span>.<span class="hljs-number">0.1</span>:<span class="hljs-number">6379</span><span class="hljs-operator">></span> |
我们可以看到，我们的数据被保存在了Redis端了，键为：PHPREDIS_SESSION:29a111bcs120sv48ibmmjqdag4.
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GG资源网 » 负载均衡中使用Redis实现共享Session
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GG资源网 » 负载均衡中使用Redis实现共享Session
