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Extending Puppet - Second Edition by Jaime Soriano Pastor, Alessandro Franceschi

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Things change

Once we introduce a tool like Puppet in our infrastructure, everything changes and we should be well aware of this.

There's a wonderful term that describes what configuration management software like Puppet or Chef involve: Infrastructure as code; we define our IT infrastructure with formal code, the configurations of our servers, the procedures to set them up, whatever is needed to turn a piece of bare metal or a blank VM in to a system that provides services for our purposes.

When we can use a programming language to configure our systems, a lot of powerful collateral effects take place:

  • Code can be versioned with an SCM: The history of our commits reflects the history of our infrastructure: we can know who made a change, when and ...

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