Foreword

I first met Alessandro in person at the inaugural Puppet Camp in San Francisco, 2009, but by this time, we'd already chatted on IRC and the Puppet Users mailing list. This was a small event by the standards of Puppet community events today, with about 60 people in attendance, and it's been great to see how many of that original crowd have continued to be active participants in the community, especially Alessandro.

While I was running Puppet at Google, I kept getting a lot of questions from attendees about how we were managing to scale our Puppet infrastructure technically. Alessandro, however, was already prodding me about how I was managing workflow and code layout for reusability and shareability, a topic that he's been very much focused ...

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