This guide explains how to set up mod_geoip with Apache2 on a Fedora 9 system. mod_geoip looks up the IP address of the client end user. This allows you to redirect or block users based on their country. You can also use this technology for your OpenX (formerly known as OpenAds or phpAdsNew) ad server to allow geo targeting.

I do not issue any guarantee that this will work for you!

 

1 Preliminary Note

I’m assuming that you have a running Fedora 9 system with a working Apache2 + PHP, e.g.

2 Installing mod_geoip

To install mod_geoip, we simply run:

yum install mod_geoip

You will then find the GeoIP database (GeoIP.dat) in the /usr/share/GeoIP directory. As the geographic allocation of IP addresses can change over time, it’s a good idea to download the newest GeoIP.dat now:

cd /usr/share/GeoIP/
mv GeoIP.dat GeoIP.dat_orig
wget http://www.maxmind.com/download/geoip/database/GeoIP.dat.gz
gunzip GeoIP.dat.gz

Next we restart Apache:

/etc/init.d/httpd restart

That’s it already!

3 A Short Test

To see if mod_geoip is working correctly, we can create a small PHP file in one of our web spaces (e.g. /var/www/html):

vi /var/www/html/geoiptest.php

<?php
print_r($_SERVER);
?>

Call that file in a browser, and it should display the SERVER array including values for GEOIP_COUNTRY_CODE, GEOIP_CONTINENT_CODE, and GEOIP_COUNTRY_NAME (make sure that you’re calling the file from a public IP address, not a local one).

Array
(
[GEOIP_CONTINENT_CODE] => EU
[GEOIP_COUNTRY_CODE] => DE
[GEOIP_COUNTRY_NAME] => Germany
[HTTP_HOST] => 84.143.142.69
[HTTP_USER_AGENT] => Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
[HTTP_ACCEPT] => text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
[HTTP_ACCEPT_LANGUAGE] => en-us,en;q=0.5
[HTTP_ACCEPT_ENCODING] => gzip,deflate
[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7
[HTTP_KEEP_ALIVE] => 300
[HTTP_CONNECTION] => keep-alive
[PATH] => /sbin:/usr/sbin:/bin:/usr/bin
[SERVER_SIGNATURE] => <address>Apache/2.2.8 (Fedora) Server at 84.143.142.69 Port 80</address>

[SERVER_SOFTWARE] => Apache/2.2.8 (Fedora)
[SERVER_NAME] => 84.143.142.69
[SERVER_ADDR] => 192.168.0.100
[SERVER_PORT] => 80
[REMOTE_ADDR] => 84.143.142.69
[DOCUMENT_ROOT] => /var/www/html
[SERVER_ADMIN] => root@localhost
[SCRIPT_FILENAME] => /var/www/html/geoiptest.php
[REMOTE_PORT] => 57421
[GATEWAY_INTERFACE] => CGI/1.1
[SERVER_PROTOCOL] => HTTP/1.1
[REQUEST_METHOD] => GET
[QUERY_STRING] =>
[REQUEST_URI] => /geoiptest.php
[SCRIPT_NAME] => /geoiptest.php
[PHP_SELF] => /geoiptest.php
[REQUEST_TIME] => 1211819286
)

4 Use Cases

You can use mod_geoip to redirect or block/allow users based on their country. You can find some useful examples for this here: http://www.maxmind.com/app/mod_geoip

5 Links