• 2010-09-10 fixed 補充 host 的通知週期圖 http://ssorc.tw/index.php?load=read&id=928

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http://blog.wu-boy.com/2010/03/26/2087/

Varnish (安裝架設篇) 來當 Web 前端 Reverse Proxy，也有 load balance 的功能，不過碰到這樣的環境，後端 Apache Server 只會抓到 Reverse Proxy IP 來當作 log 紀錄，而無法正確取得 Client 端 IP，Varnish 官網 FAQ 有提到 log 檔案得的解決方法，不過在程式方面，要大量的修改，假設今天 Apache 跑10個 Virtual Host ，不就要去改10個網站程式，背後或許是一些大型 open source 的 Project，改起來相當不容易，也很費工夫。Darkhero 提供了 reverse proxy add forward module for Apache (mod_rpaf) 模組，只要裝上這模組，Apache 就不必動到其它設定就可以正確紀錄 log 檔案，且程式都不必修改，就可以得到正確 IP 了。

http://varnish-cache.org/

Varnish is a state-of-the-art, high-performance HTTP accelerator. It uses the advanced features in Linux 2.6, FreeBSD 6/7 and Solaris 10 to achieve its high performance.

Some of the features include

• A modern design
• VCL - a very flexible configuration language
• Load balancing with health checking of backends
• Partial support for ESI
• URL rewriting
• Graceful handling of "dead" backends
• more features...

Varnish is free software and is licenced under a modified BSD licence. Please read the introduction to get started with Varnish.

See what people blog about varnish

http://www.neo.com.tw/archives/555

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http://mituzas.lt/2009/02/03/mydumper/