1. @agatestudio
Varnish
Aswin
Knight
Agate Studio

2. @agatestudio@agatestudio@agatestudio
VARNISH
Aswin Juari

3. @agatestudio@agatestudio@agatestudio
Overview
• What is varnish
• Why Varnish
• What to do

4. @agatestudio@agatestudio@agatestudio
What
• A Proxy
• A Load balancer
• An Http Accelerator which accelerates by caching
output from apache/another web server.

5. @agatestudio@agatestudio@agatestudio
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

6. @agatestudio@agatestudio@agatestudio
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";
}

7. @agatestudio@agatestudio@agatestudio
What to do
• Request Scheme Varnish:
Request Received  vcl_recv()  vcl_pass() 
vcl_fetch()  vcl_deliver()  Request Completed

8. @agatestudio@agatestudio@agatestudio
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);
}

9. @agatestudio@agatestudio@agatestudio
What to do
sub vcl_fetch {
# Our cache TTL
set beresp.ttl = 1m;
return(deliver);
}
Set Cache not older than 1 minute

10. @agatestudio@agatestudio@agatestudio
Varnish vs NginX
• Varnish cannot do https request :D. Meanwhile nginx
can 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

11. @agatestudio@agatestudio@agatestudio
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