Varnish是一款高性能的开源HTTP加速器，挪威最大的在线报纸 Verdens Gang (http://www.vg.no) 使用3台Varnish代替了原来的12台squid，性能居然比以前更好。

Varnish 3.0 的发行包括源码包和二进制包，请选择你想要的发行版：

• 源码
• Debian
• FreeBSD
• Red Hat Enterprise Linux 5
• Ubuntu

从 2.1.5 to 3.0.0 的变化：

• Module support through VMODs.
• Compression and uncompression support, including stiching together compressed ESI fragments.
• Preliminary streaming support, both on miss and on pass.
• Much improved documentation.
• Better default values for parameters.
• Varnishncsa now has custom log format support.
• Varnishlog, varnishncsa and varnishhist can now filter out records that match multiple expressions.

完整改进内容请看 the changes document.

文章来源：开源中国社区