@agatestudio

Varnish

Aswin

Knight

Agate Studio

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VARNISHAswin Juari

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Overview

• What is varnish

• Why Varnish

• What to do

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What

• A Proxy

• A Load balancer

• An Http Accelerator which accelerates by caching output from apache/another web server.

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Why

• So, instead of web server doing the same process and the same result, why not caching the result and pass to user.

• However, remember that:

– Your data might be obsolete/incorrect

– So, you must configure varnish correctly.• Determine which one that can be processed by varnish

• Or the one that must be checked by Web Server

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What to do

• Configure Varnish at port 80, Apache at another port (e.g. 8080)

vcl 4.0;

backend default {

.host = "127.0.0.1";

.port = "8080";

}

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What to do

• Request Scheme Varnish:

Request Received vcl_recv() vcl_pass() vcl_fetch() vcl_deliver() Request Completed

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What to do

Pass: Send it to apache

Lookup: try to get it from cache

sub vcl_recv {

# Set the URI of your system directory

if (req.url ~ '^/admin/' ||

req.url ~ 'ACT=' ||

req.request == 'POST')

{

return (pass);

}

#unset user cookie from being saved to

cache

unset req.http.Cookie;

return(lookup);

}

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What to dosub vcl_fetch {

# Our cache TTL

set beresp.ttl = 1m;

return(deliver);

}

Set Cache not older than 1 minute

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Varnish vs NginX

• Varnish cannot do https request :D. Meanwhile nginxcan do that.

• Others said that better we use nginx only :D

– Config varnish, nginx, apache is not worth of time

– Nginx + PHP + DB + APC/Memcache is more than enough

– So, it depends on App in the Server

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Sources

• https://www.varnish-cache.org/docs/4.0/tutorial/index.html

• http://ellislab.com/blog/entry/making-sites-fly-with-varnish

• https://www.varnish-software.com/system/files/web_downloads/varnish-book.pdf