Varnish是一款高性能的開源HTTP加速器，挪威最大的在線報紙 Verdens Gang 使用3台Varnish代替了原來的12台Squid，性能比以前更好。
Varnish 的作者Poul-Henning Kamp是FreeBSD的內核開發者之一，他認為現在的計算機比起1975年已經複雜許多。在1975年時，儲存媒介只有兩種：內存與硬碟。但現在計算機系統的內存除了主存外，還包括了CPU內的L1、L2，甚至有L3快取。硬碟上也有自己的快取裝置，因此Squid Cache自行處理物件替換的架構不可能得知這些情況而做到最佳化，但操作系統可以得知這些情況，所以這部份的工作應該交給操作系統處理，這就是 Varnish cache設計架構。
varnish項目是2006年發布的第一個版本0.9.距今已經有十多年，經過varnish開發團隊和網友們的辛苦耕耘，現在的varnish已經很健壯。很多門戶網站已經部署了varnish，並且反應都很好，甚至反應比squid還穩定，且效率更高，資源佔用更少。相信在反向代理，web加速方面，varnish已經有足夠能力代替squid。
下面為FREEBSD UNIX安裝VARNISH的過程，VARNISH的具體配置過程，以會陸續發布在本博客，敬請期待。
gmake[1]: Leaving directory ‘/usr/ports/www/varnish5/work/varnish-cache-varnish-5.1.3’
====> Compressing man pages (compress-man)
===> Staging rc.d startup script(s)
===> Installing for varnish5-5.1.3
===> Checking if varnish5 already installed
===> Registering installation for varnish5-5.1.3
Installing varnish5-5.1.3…
===> Creating groups.
Creating group ‘varnish’ with gid ‘429’.
===> Creating users
Creating user ‘varnish’ with uid ‘429’.
Creating user ‘varnishlog’ with uid ‘430’.
QUICK-START GUIDE
It’s two in the morning and someone posted a link to your website on
slashdot. Don’t panic, it takes only a minute to set up Varnish in
front of your web server:
1) Install Varnish
2) Reconfigure your web server to listen on localhost:8080
3) sysrc varnishd_enable=YES
4) service varnishd start
Refer to the documentation for more advanced configuration.
===> SECURITY REPORT:
This port has installed the following files which may act as network
servers and may therefore pose a remote security risk to the system.
/usr/local/sbin/varnishd
/usr/local/bin/varnishtest
This port has installed the following startup scripts which may cause
these network services to be started at boot time.
/usr/local/etc/rc.d/varnishncsa
/usr/local/etc/rc.d/varnishd
/usr/local/etc/rc.d/varnishlog
If there are vulnerabilities in these programs there may be a security
risk to the system. FreeBSD makes no guarantee about the security of
ports included in the Ports Collection. Please type ‘make deinstall’
to deinstall the port if this is a concern.
For more information, and contact details about the security
status of this software, see the following webpage:
http://www.varnish-cache.org/
===> Cleaning for varnish5-5.1.3
root@wiz:/usr/ports/www/varnish5 # pwd
/usr/ports/www/varnish5
root@wiz:/usr/ports/www/varnish5 # make install clean
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