Common SESSION Synchronization Mechanisms in Web Clusters

             WEBcluster，Howeverload balancing，sessionsynchronizeproblem，UserLogin，Login 。BecauseIPserver。PHPBlog[http://blog.phpha.com /]solution。

、databasesynchronizesession
serversessionsynchronize，If，：
1)databasewebserversession，，databasefileserver，Userwebserver，databasechecksession，sessionsynchronize。
2)sessiondatabase，Ifmysqlcluster，mysqlnode，sessiondatasynchronize。
Description：databasesynchronizesession，database，database，Ifsessiondatabase，。，，session，database

、cookiesynchronizesession
sessionfileserver，cookiefileclient，Implementationsynchronize？，User sessioncookie，cookie。webserverA，sessioncookie， webserverB，，webserverBserversession，If，clientcookie session，If，Descriptionsession，Ifcookie，cookiesessoinsynchronizewebserverB， Implementationsessionsynchronize。
Description：Implementation，，database，HoweverIfclientcookie，sessionsynchronize，；cookieSecurity，Although，However。

、memcachesynchronizesession
memcachedistributed，IfFunctions，sessionsynchronize。webservermemory，”memory”，serversessoin”memory”，。
：synchronizesession，database，Securitycookie，sessionmemory，file。
：memcachememory，，，memcachememory，memory，If，out of memory。

、Summary
，
，system，Recommendation；
，，Security；
，，Recommendation

、webclustermemcachesynchronizesession
1)webcluster
Startmemcachedprocess，server

1. /usr/local/bin/memcached –d –m 1024 –c 3000 –u uenucom –p 12000 –P ./memcached.pid
2. /usr/local/bin/memcached –d –m 1024 –c 3000 –u uenucom –p 13000 –P ./mem.pid

2)phpConfiguration

1. vi /usr/local/php/lib/php.ini
2. session.save_handler = "memcache"
3. memcache.hash_strategy = "consistent"
4. session.save_path = "tcp://127.0.0.1:13000?weight=10,tcp://127.0.0.1:12000"

Description:，sessionmemcache；，memcachehashconsistent；，session；
3)apache
phpinfo

1. session
2. Session Supportenabled
3. Registered save handlersfiles user sqlite memcache
4. Registered serializer handlersphp php_binary

Next

1. session.save_pathtcp://127.0.0.1:13000,tcp://127.0.0.1:12000

4)Testing
a)filesession.php

1. php
2. session_start();
3. $_SESSION['username'] = "abcabc";
4. echo session_id();
5. ?>

b)sessionfile

1. php
2. $mem = new Memcache;
3. $mem->addServer("127.0.0.1″,12000) or die ("Could not add server 12000″);
4. $mem->addServer("127.0.0.1″,13000) or die ("Could not add server 13000″);
5. $val = $mem->get('qp0mrob2ovcqle3u4lbr4obsa5');
6. echo $val;
7. ?>

c)

1. username|s:6:"abcabc";

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