Slides from a talk I gave at PuppetConf 2015.
Abstract: I joined Constant Contact in the Spring of 2014 to help transform their Puppet infrastructure. Constant Contact was a very early adopter of Puppet and had a hard time keeping up with changes to the language. When I got to Constant Contact we were stuck on a very old version of Puppet 2.7 because our code was heavily dependent on inheritance and dynamic scoping. There was no separation of data and code and 99% of the Puppet modules in use in the environment were homegrown. With over 267,000 lines of ancient code, I was completely overwhelmed with how to get us up to speed. This talk is about how we managed to accomplish this incredible feat in just over a year.