How-To: Build your own network firewall
“Network appliances don’t always offer all the firewalling features a user needs — you know, the advanced port blocking and security proedures we’d like to keep our little home network fiefdoms secure. In today’s How-To we’ll show you how to build a firewall out of an old PC with a live Linux CD and some spare ethernet cards.”
Mirror Your Web Site With rsync
This tutorial shows how you can mirror your web site from your main web server to a backup server that can take over if the main server fails. We use the tool rsync for this, and we make it run through a cron job that checks every x minutes if there is something to update on the mirror.
Put a live Digg button on your website
Here’s a javascript trick you can use to put a live working Digg button on your website that actually lets people digg without leaving your page.
Mapping website visitors in real time
A while ago I had an idea. What if I were to try to geographically locate all the visitors to my website, and tag their locations on a map? Using Google Maps, Ajax, MySQL and some PHP, it came together quite nicely.