Puppet: Mastering Infrastructure Automation

Structured design patterns

Your knowledge of classes and defined types is still rather academic. You have learned about their defining aspects and the syntax to use them, but we have yet to give you a feeling of how these concepts come to bear in different real-life scenarios.

The following sections will present an overview of what you can do with these language tools.

Writing comprehensive classes

Many classes are written to make Puppet perform momentous tasks on the agent platform. Of these, the Apache class is probably one of the more modest examples. You can conceive a class that can be included from any machine's manifest and make sure that the following conditions are met:

• The firewalling software is installed and configured with a default ruleset ...