https://wiki.ubuntu.com/UncomplicatedFirewall
Very simple guide to using ufw to create firewall rules. `ufw allow ssh/tcp && ufw allow http/tcp && ufw allow https/tcp && ufw enable && ufw status` done. :-)
http://themomorohoax.com/2010/07/31/ruby-chef-tutorial
Handy article introducing chef and providing a few links. A little out of date now, but provides a useful intro.
http://www.webpop.com/blog/posts/building-a-scalable-cms-on-the-rackspace-cloud
Interesting article on how webpop built their infrastructure on Rackspace's cloud. Includes links to a few useful tools (chef, wormly, new relic, nagios, ganglia, and others).
http://blog.cfelde.com/2011/05/performance-rackspace-cloud-vs-amazon-web-services/
Interesting article comparing Rackspace and AWS performance when applying high frequency trading strategies against 10 years of archive data. Rackspace io kicks ass, CPU slightly ahead.
http://www.magentocommerce.com/magento-connect/One+Pica/extension/1279/one-pica-image-cdn
CDN plugin for Magento that supports Rackspace and Amazon AWS CloudFront. Pushes images on demand, claims to be simple to integrate, and is free.
http://kencochrane.net/blog/2011/06/django-gunicorn-nginx-supervisord-fabric-centos55/
Useful article on how to deploy django apps on nginx. Handy.
