6. Cookbooks and LWRPs | Mastering Chef

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Mastering Chef

By : Mayank Joshi

2.5 (4)

Mastering Chef

2.5 (4)

By: Mayank Joshi

Overview of this book

If you have used Chef before and are interested in automation of infrastructure and want to develop your own tools to manage large-scale infrastructures, then this book is for you.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to the Chef Ecosystem

1. Introduction to the Chef Ecosystem

Different modes of running Chef

Terminology used in the world of Chef

The anatomy of a Chef run

Setting up a work environment

Summary

2. Knife and Its Associated Plugins

2. Knife and Its Associated Plugins

Introducing Knife

Summary

3. Chef and Ruby

3. Chef and Ruby

Ruby

IRB

Variables and types

Symbols

Basic operations

Conditional statements and loops

Methods

Arrays

Bang methods

Hashes

Classes and objects

Summary

4. Controlling Access to Resources

4. Controlling Access to Resources

The bootstrap process

Authentication

Authorization

Summary

5. Starting the Journey to the World of Recipes

5. Starting the Journey to the World of Recipes

Resources

Recipes

Best practices when writing recipes

Summary

6. Cookbooks and LWRPs

6. Cookbooks and LWRPs

Cookbooks

Custom resources

Summary

7. Roles and Environments

7. Roles and Environments

Managing roles

Managing environments

Setting up an environment on a node

Role and environment attributes

Environment run lists

Summary

8. Attributes and Their Uses

8. Attributes and Their Uses

Attribute naming

Different types of attributes

Different sources of attributes

Attribute precedence

Attribute whitelisting

Summary

9. Ohai and Its Plugin Ecosystem

9. Ohai and Its Plugin Ecosystem

Running the Ohai binary

Ohai plugins

Custom plugins

Summary

10. Data Bags and Templates

10. Data Bags and Templates

Data bags

Templates

Summary

11. Chef API and Search

11. Chef API and Search

Prerequisites for using Chef API

Authentication of requests

Endpoints

Search

Ridley

Summary

12. Extending Chef

12. Extending Chef

Custom Knife plugins

Custom Chef handlers

Summary

13. (Ab)Using Chef

13. (Ab)Using Chef

The dynamic server list in Capistrano using Chef

Capistrano style deployments using Chef's "deploy" resource

Extending Chef to bootstrap distributed systems

Test-driven development with Chef

Types of tests

Summary

Index

Index

Customer Reviews

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Custom resources

There are two ways to define custom resources – via LWRPs (lightweight resource providers) or HWRPs (heavyweight resource providers). Before LWRPs were introduced, all extensions to Chef were written using Ruby, and these are referred to as HWRPs. While LWRPs are simple, a HWRP is extremely flexible. The HWRPs reside in the libraries folder of the cookbook repository. Chef tries to import anything residing there at runtime and is interpreted as code, rather than a Chef DSL. We'll mostly be concerned with LWRPs in this chapter.

A LWRP is meant to extend chef-client so that custom actions can be defined and eventually used in a recipe.

A LWRP has two main components. They are as follows:

A lightweight resource that defines a set of actions and attributes
A lightweight provider that tells the chef-client how to handle each action

One may use existing resources or custom Ruby code to build a new LWRP. Once a LWRP is ready, it's read every time during the chef-client run and processed...

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Programming languages

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