Записки программиста, обо всем и ни о чем. Но, наверное, больше профессионального.

2009-06-12

Балансер

Не сложно поместить веб-сервер на кластер, с целью балансировать нагрузку. Сложно поддерживать сессии пользовательские на таком кластере. Либо надо при открытии сессии пользователя закреплять за конкретным серверным хостом, либо надо передавать данные сессии на хост, отрабатывающий очередной запрос.

А может и не надо ничего делать, все уже сделано до нас:

Since Apache 2.1, a new module called mod_proxy_balancer is available which lets you turn a system that has Apache installed into a loadbalancer. This loadbalancer retrieves requested pages from two or more backend webservers and delivers them to the user's computer. Users get the impression that they deal with just one server (the loadbalancer) when in fact there are multiple systems behind the loadbalancer that process the users' requests. By using a loadbalancer, you can lower the load average on your webservers. One important feature of mod_proxy_balancer is that it can keep track of sessions which means that a single user always deals with the same backend webserver. Most websites are database-driven nowadays with user logins etc., and you'd get weird results if a user logs in on one backend webserver, and then his next request goes to another backend webserver, meaning he'd get logged out again. You can avoid this by using mod_proxy_balancer's session-awareness.

howtoforge.com


Кстати, хотите знать все про куки?
Вам сюда: http://hc.apache.org/httpclient-3.x/cookies.html
Интересный проект, кстати. Реализация HTTP клиента, открытый код, ява.

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