dle all applications and services, it can quickly dwarf any other single codebase main‐
tained by your organization.
This book highlights design patterns, both good and bad, that you can use when
deploying Puppet environments, and discusses the impact of each decision. The con‐
ceptual designs and implementation patterns contained in this book will help you to
create solutions that can be extended, maintained, and supported—not only by your‐
self, but by diverse global teams and the people who might inherit your work down
the road.
A Word on Puppet Today
First, we’d like to take a moment to acknowledge all of you who have been waiting for
this book. Compiling the best of existing practices on a product and community that
are constantly evolving and refining is more difficult than you might expect. Some of
these practices were updated just hours before the book went to press.
Puppet Best Practices have evolved continuously since Puppet’s early releases. In every
way, Puppet is much easier to work with and support than it was five years ago. For
example, puppet lookup and the new multilayered approach to Hiera data that
allows data hierarchies in environments and modules have made it much simpler to
create and reuse community modules.
On the other hand, change requires adaptation and refactoring. The new parser used
by Puppet 4 and higher have introduced new syntax and deprecated some older fea‐
tures. Puppet design patterns have evolved, and the demarcation points between vari‐
ous systems aren’t always clear. Even just picking which versions to support—never
mind which practices to highlight—involved many hours of debate between two
authors who wanted to help the most people possible.
We feel that this is the very best book we can give you today. Best practices will con‐
tinue to evolve. Common complaints will be resolved. New issues will be discovered.
This process will iterate indefinitely. We look forward to seeing you present a new
pattern that we hadn’t imagined when this book was written, either in your blog, at a
Puppet camp, or a conference. We are absolutely confident that you will.
We intend to keep updating this book as Puppet and its usage evolves, keeping it cur‐
rent and relevant. As you read this, the next update to this book is already in progress
—with an entire new chapter about Puppet Tasks—as the community development
starts to find common ground.
xiv | Preface
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