DevOps: Puppet, Docker, and Kubernetes

Chapter 3. Writing Better Manifests

	"Measuring programming progress by lines of code is like measuring aircraft building progress by weight."
	--Bill Gates

In this chapter, we will cover:

• Using arrays of resources
• Using resource defaults
• Using defined types
• Using tags
• Using run stages
• Using roles and profiles
• Passing parameters to classes
• Passing parameters from Hiera
• Writing reusable, cross-platform manifests
• Getting information about the environment
• Importing dynamic information
• Passing arguments to shell commands

Introduction

Your Puppet manifests are the living documentation for your entire infrastructure. Keeping them tidy and well organized is a great way to make it easier to maintain and understand. Puppet gives you a number of tools to do this, as follows: ...