Puppet testing, cookbook, security

Modern Module Development

http://www.slideshare.net/PuppetLabs/modern-module-development-ken-barber-2012-edinburgh-puppet-camp

Testing

http://ruby.dzone.com/articles/puppet-unit-testing-pro

https://puppetlabs.com/blog/test-driven-development-with-puppet/

Cookbook

http://www.puppetcookbook.com/

Security

http://www.masterzen.fr/2010/11/14/puppet-ssl-explained/

http://www.amazon.com/dp/0201615983