Varnish Caching

http://www.flickr.com/photos/jkannenberg/541059011gareth rushgrove | morethanseven.net

Varnish CacheClever Software for Making HTTP Applications Faster

Refresh Cambridge 6th July 2011

http://flickr.com/photos/psd/102332391/


Gareth Rushgrove

gareth rushgrove | morethanseven.net

Work at freeagentcentral.com


Blog at morethanseven.net


Currate devopsweekly.com


www.varnish-cache.org


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gareth rushgrove | morethanseven.net http://www.flickr.com/photos/exalthim/3597210568

What is Varnish?

Varnish Cache is an open source, state of the art web application accelerator. You install it on your web server and it makes your website fly.Official blurb




Seriously, what is Varnish?

- Cache

- Reverse Proxy- HTTP Accelerator


A Story of HTTP Caching

http://www.flickr.com/photos/solsken/62924477




A Typical App

Database Web Server Web Traffic


More Traffic == Slower responses

Database Web Server


Eventually...

Database Web Server

Database Web Server Varnish


Add Varnish

Database Web Server Varnish


Deal with more traffic

An Example

gareth rushgrove | morethanseven.net http://www.flickr.com/photos/jonrb/3735816042




www.vagrantbox.es

Overengineering for Fun

Database

Gunicorn Varnish Nginx

Gunicorn Varnish Nginx

memcached

memcached

backend default { .host = "127.0.0.1"; .port = "8000";}sub vcl_recv { if (req.request == "GET" && req.http.cookie) { return(lookup); }}sub vcl_fetch { if (beresp.ttl < 180s) { set beresp.ttl = 180s; } esi; if (beresp.http.Set-Cookie) { return(deliver); }}

Varnish Configuration


⚡ ab -c 10 -n 400 http://www.vagrantbox.es/

Requests per second: 59.63 [#/sec] (mean)

Percentage of the requests served within a certain time (ms) 50% 164 66% 174 75% 183 80% 188 90% 207 95% 231 98% 246 99% 279 100% 408 (longest request)

Without Varnish


http://www.vagrantbox.es


⚡ ab -c 10 -n 400 http://www.vagrantbox.es/

Requests per second: 103.61 [#/sec] (mean)

Percentage of the requests served within a certain time (ms) 50% 92 66% 101 75% 107 80% 111 90% 120 95% 129 98% 141 99% 149 100% 157 (longest request)

With Varnish




Questions?

gareth rushgrove | morethanseven.net http://flickr.com/photos/psd/102332391/



Varnish Caching

Technology

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