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Mastering Puppet

Mastering Puppet

By : Thomas Uphill
3.9 (13)
Buy this Book
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Mastering Puppet

Mastering Puppet

3.9 (13)
By: Thomas Uphill
Buy this Book

Overview of this book

Presented in an easy-to-follow, step-by-step tutorial format and packed with examples, this book will lead you through making the best out of Puppet in an enterprise environment. If you are a system administrator or developer who has used Puppet in production and are looking for ways to easily use Puppet in an enterprise environment, this book is for you. This book assumes an intermediate knowledge of Puppet and is intended for those writing modules or deploying Puppet in an enterprise environment.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Dealing with Load/Scale
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1. Dealing with Load/Scale
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Divide and conquer
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Conquer by dividing
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Summary
2
2. Organizing Your Nodes and Data
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2. Organizing Your Nodes and Data
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Getting started
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Organizing the nodes with ENC
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Hiera
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Summary
3
3. Git and Environments
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3. Git and Environments
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Environments
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Git
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Git for everyone
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Summary
4
4. Public Modules
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4. Public Modules
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Getting modules
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Using GitHub for public modules
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Modules from the Forge
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Using librarian
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Using r10k
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Using modules
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Summary
5
5. Custom Facts and Modules
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5. Custom Facts and Modules
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Module manifest files
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Custom facts
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Summary
6
6. Custom Types
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6. Custom Types
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Parameterized classes
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Defined types
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Types and providers
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Summary
7
7. Reporting and Orchestration
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7. Reporting and Orchestration
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Turning on reporting
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Syslog
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Store
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IRC
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Foreman
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Puppet Dashboard
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Summary
8
8. Exported Resources
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8. Exported Resources
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Configuring puppetdb – using the forge module
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Manually installing puppetdb
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Exported resource concepts
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Simple example: a host entry
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Resource tags
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Putting it all together
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Summary
9
9. Roles and Profiles
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9. Roles and Profiles
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Design pattern
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Creating an example CDN role
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Dealing with exceptions
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Summary
10
10. Troubleshooting
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10. Troubleshooting
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Connectivity issues
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Catalog failures
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Debugging
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Summary
11
Index
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Index

Custom facts

While managing a complex environment, facts can be used to bring order out of chaos. If your manifests have large case statements or nested if statements, a custom fact may help reduce the complexity or allow you to change your logic.

When you work in a large organization, keeping the number of facts to a minimum is important as several groups may be working on the same system and thus interaction between users may adversely affect one another's work or they may find it difficult to understand how everything fits together.

As we have already seen in the previous chapter, if our facts are simple text values that are node specific, we can just use stdlib's facts.d directory to create static facts that are node specific.

This facts.d mechanism is included by default on facter Versions 1.7 and higher, and they are referred to as external facts.

Creating custom facts

We will be creating some custom facts, so we will create our Ruby files in the module_name/lib/facter directory...

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