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Lightning talk given at Refresh Cambridge event on 6th July 2011. Very quick introduction to where an HTTP Caching solution fits in, and an example of the kind of effect it could have on performance.
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http://www.flickr.com/photos/jkannenberg/541059011gareth rushgrove | morethanseven.net
Varnish CacheClever Software for Making HTTP Applications Faster
Refresh Cambridge 6th July 2011
Gareth Rushgrove
gareth rushgrove | morethanseven.net
Work at freeagentcentral.com
gareth rushgrove | morethanseven.net
Blog at morethanseven.net
gareth rushgrove | morethanseven.net
Currate devopsweekly.com
gareth rushgrove | morethanseven.net
www.varnish-cache.org
gareth rushgrove | morethanseven.net
“
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
gareth rushgrove | morethanseven.net
Seriously, what is Varnish?
- Cache
- Reverse Proxy- HTTP Accelerator
gareth rushgrove | morethanseven.net
A Story of HTTP Caching
http://www.flickr.com/photos/solsken/62924477
gareth rushgrove | morethanseven.net
A Typical App
Database Web Server Web Traffic
gareth rushgrove | morethanseven.net
More Traffic == Slower responses
Database Web Server
gareth rushgrove | morethanseven.net
Eventually...
Database Web Server
Database Web Server Varnish
gareth rushgrove | morethanseven.net
Add Varnish
Database Web Server Varnish
gareth rushgrove | morethanseven.net
Deal with more traffic
An Example
gareth rushgrove | morethanseven.net http://www.flickr.com/photos/jonrb/3735816042
gareth rushgrove | morethanseven.net
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
gareth rushgrove | morethanseven.net
⚡ 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
gareth rushgrove | morethanseven.net
⚡ 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
gareth rushgrove | morethanseven.net
Questions?
gareth rushgrove | morethanseven.net http://flickr.com/photos/psd/102332391/
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