大家好,我现在有两台阿里云ECS,都在北京区,还有一个阿里云的云数据库Memcache版。
我现在想实现共享同一域名下的session,这样我通过负载均衡随机分配到这两台服务器上,只要登录其中一台服务器即可共享登录。
然后,我是通过修改php.ini来实现把session存储到memcache上的,这些都ok了,但是现在发现一个问题是两台服务器的session并不是同步的,这是为什么呢?
服务器A:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; var_dump($_SESSION); echo ''; echo "\n The A"
服务器B:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; $_SESSION['1'] = 'abc'; var_dump($_SESSION); echo ''; echo "\n The B" ?>
打印结果是:服务器A
<code>jck9tkdggk9drukfnu571hbjj5 array(0) { } The A</code>
服务器B
<code>jck9tkdggk9drukfnu571hbjj5 array(1) { [1]=> string(3) "abc" } The B</code>
这是为什么呢?通过memcache的命令行得知,php已经将session存入memcache了。
求解答,谢谢。
回复内容:
大家好,我现在有两台阿里云ECS,都在北京区,还有一个阿里云的云数据库Memcache版。
我现在想实现共享同一域名下的session,这样我通过负载均衡随机分配到这两台服务器上,只要登录其中一台服务器即可共享登录。
然后,我是通过修改php.ini来实现把session存储到memcache上的,这些都ok了,但是现在发现一个问题是两台服务器的session并不是同步的,这是为什么呢?
服务器A:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; var_dump($_SESSION); echo ''; echo "\n The A"
服务器B:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; $_SESSION['1'] = 'abc'; var_dump($_SESSION); echo ''; echo "\n The B" ?>
打印结果是:服务器A
<code>jck9tkdggk9drukfnu571hbjj5 array(0) { } The A</code>
服务器B
<code>jck9tkdggk9drukfnu571hbjj5 array(1) { [1]=> string(3) "abc" } The B</code>
这是为什么呢?通过memcache的命令行得知,php已经将session存入memcache了。
求解答,谢谢。
session 跟 cookie 的关系要理清楚
前提是基于同一个域,获取相同的cookie,继而获取相同的sessionid,获取相同的session内容,共享session
你的例子中,打印的服务器A的结果中的id ,跟服务器B的结果中的id, jck9tkdggk9drukfnu571hbjj5
,是相同的? 还是你修饰过例子 ?

Effective methods to prevent session fixed attacks include: 1. Regenerate the session ID after the user logs in; 2. Use a secure session ID generation algorithm; 3. Implement the session timeout mechanism; 4. Encrypt session data using HTTPS. These measures can ensure that the application is indestructible when facing session fixed attacks.

Implementing session-free authentication can be achieved by using JSONWebTokens (JWT), a token-based authentication system where all necessary information is stored in the token without server-side session storage. 1) Use JWT to generate and verify tokens, 2) Ensure that HTTPS is used to prevent tokens from being intercepted, 3) Securely store tokens on the client side, 4) Verify tokens on the server side to prevent tampering, 5) Implement token revocation mechanisms, such as using short-term access tokens and long-term refresh tokens.

The security risks of PHP sessions mainly include session hijacking, session fixation, session prediction and session poisoning. 1. Session hijacking can be prevented by using HTTPS and protecting cookies. 2. Session fixation can be avoided by regenerating the session ID before the user logs in. 3. Session prediction needs to ensure the randomness and unpredictability of session IDs. 4. Session poisoning can be prevented by verifying and filtering session data.

To destroy a PHP session, you need to start the session first, then clear the data and destroy the session file. 1. Use session_start() to start the session. 2. Use session_unset() to clear the session data. 3. Finally, use session_destroy() to destroy the session file to ensure data security and resource release.

How to change the default session saving path of PHP? It can be achieved through the following steps: use session_save_path('/var/www/sessions');session_start(); in PHP scripts to set the session saving path. Set session.save_path="/var/www/sessions" in the php.ini file to change the session saving path globally. Use Memcached or Redis to store session data, such as ini_set('session.save_handler','memcached'); ini_set(

TomodifydatainaPHPsession,startthesessionwithsession_start(),thenuse$_SESSIONtoset,modify,orremovevariables.1)Startthesession.2)Setormodifysessionvariablesusing$_SESSION.3)Removevariableswithunset().4)Clearallvariableswithsession_unset().5)Destroythe

Arrays can be stored in PHP sessions. 1. Start the session and use session_start(). 2. Create an array and store it in $_SESSION. 3. Retrieve the array through $_SESSION. 4. Optimize session data to improve performance.

PHP session garbage collection is triggered through a probability mechanism to clean up expired session data. 1) Set the trigger probability and session life cycle in the configuration file; 2) You can use cron tasks to optimize high-load applications; 3) You need to balance the garbage collection frequency and performance to avoid data loss.


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