Varnish Geo-IP VCL
===========================

Last updated: 1/12/2011
	Cosimo Streppone <cosimo@opera.com>
	Opera Software ASA

Here you will find a VCL config file for Varnish (http://varnish-cache.org)
This VCL will transparently add a HTTP request header with Geo-IP information
depending on the client IP address that made the request.

*** WARNING ***
This VCL consists of C code. Your Varnish might explode. YMMV.
Don't use it in production if you don't know what you're doing.
We are using it in production, but we _don't_ know what we're doing :).

Why would you want this?
------------------------
So your backend application can just read a HTTP header and figure out
where the client comes from, city, country and latitude/longitude.
Of course this doesn't come for free. You need the city edition of Geo-IP.

The rewritten header is "X-Geo-IP".

Requirements
------------

- gcc, make
- a recent perl, with `prove'

Instructions
-------------

1) Run 'make && make test'
   You should see "All tests successful" at the end of the execution

2) Install the generated geoip.vcl in /etc/varnish/

3) At the top of your main VCL file, add the following line:

     include "/etc/varnish/geoip.vcl"

   and then in your vcl_recv() add:

     C{
     vcl_geoip_set_header(sp);
     }C

4) If you run Debian, look here:

   http://my.opera.com/cstrep/blog/2011/11/30/how-to-start-up-varnish-with-a-custom-cc-command-on-debian

   for instructions on how to specify a custom "cc_command" in
   the Varnish init script.

5) Restart Varnish

6) ?

7) Profit !!