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  • Book Overview & Buying Chef Infrastructure Automation Cookbook Second Edition
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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

By : Marschall
3.7 (6)
Buy this Book
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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

3.7 (6)
By: Marschall
Buy this Book

Overview of this book

This book is for system engineers and administrators who have a fundamental understanding of information management systems and infrastructure. It helps if you've already played around with Chef; however, this book covers all the important topics you will need to know. If you don't want to dig through a whole book before you can get started, this book is for you, as it features a set of independent recipes you can try out immediately.
Table of Contents (9 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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Sections
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Conventions
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Reader feedback
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Customer support
Free Chapter
1
1. Chef Infrastructure
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1. Chef Infrastructure
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Introduction
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Using version control
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Installing the Chef development kit on your workstation
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Using the hosted Chef platform
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Managing virtual machines with Vagrant
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Creating and using cookbooks
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Inspecting files on your Chef server with knife
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Defining cookbook dependencies
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Managing cookbook dependencies with Berkshelf
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Downloading and integrating cookbooks as vendor branches into your Git repository
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Using custom knife plugins
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Deleting a node from the Chef server
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Developing recipes with local mode
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Using roles
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Using environments
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Freezing cookbooks
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Running Chef client as a daemon
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Using chef-shell
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2. Evaluating and Troubleshooting Cookbooks and Chef Runs
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2. Evaluating and Troubleshooting Cookbooks and Chef Runs
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Introduction
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Testing your Chef cookbooks
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Flagging problems in your Chef cookbooks
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Test-driven development for cookbooks using ChefSpec
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Integration testing your Chef cookbooks with Test Kitchen
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Showing affected nodes before uploading cookbooks
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Overriding a node's run list to execute a single recipe
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Using why-run mode to find out what a recipe might do
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Debugging Chef client runs
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Inspecting the results of your last Chef run
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Raising and logging exceptions in recipes
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Diff-ing cookbooks with knife
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Using community exception and report handlers
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Creating custom handlers
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3. Chef Language and Style
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3. Chef Language and Style
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Introduction
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Using community Chef style
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Using attributes to dynamically configure recipes
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Using templates
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Mixing plain Ruby with Chef DSL
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Installing Ruby gems and using them in recipes
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Using libraries
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Using definitions
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Creating your own Lightweight Resource Providers (LWRP)
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Extending community cookbooks by using application wrapper cookbooks
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Creating custom Ohai plugins
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Creating custom knife plugins
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4. Writing Better Cookbooks
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4. Writing Better Cookbooks
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Introduction
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Setting the environment variables
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Passing arguments to shell commands
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Overriding attributes
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Using search to find nodes
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Using data bags
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Using search to find data bag items
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Using encrypted data bag items
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Accessing data bag values from external scripts
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Getting information about the environment
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Writing cross-platform cookbooks
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Finding the complete list of operating systems you can use in cookbooks
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Making recipes idempotent by using conditional execution
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5. Working with Files and Packages
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5. Working with Files and Packages
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Introduction
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Creating configuration files using templates
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Using pure Ruby in templates for conditionals and iterations
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Installing packages from a third-party repository
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Installing software from source
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Running a command when a file is updated
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Distributing directory trees
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Cleaning up old files
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Distributing different files based on the target platform
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6. Users and Applications
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6. Users and Applications
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Introduction
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Creating users from data bags
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Securing the Secure Shell Daemon (SSHD)
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Enabling passwordless sudo
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Managing NTP
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Managing nginx
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Creating nginx virtual hosts
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Creating MySQL databases and users
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Managing WordPress sites
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Managing Ruby on Rails applications
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Managing Varnish
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Managing your local workstation
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7. Servers and Cloud Infrastructure
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7. Servers and Cloud Infrastructure
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Introduction
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Creating your infrastructure using Chef Provisioning
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Creating cookbooks from a running system with Blueprint
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Running the same command on many machines at once
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Setting up SNMP for external monitoring services
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Deploying a Nagios monitoring server
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Building high-availability services using heartbeat
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Using HAProxy to load-balance multiple web servers
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Using custom bootstrap scripts
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Managing firewalls with iptables
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Managing fail2ban to ban malicious IP addresses
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Managing Amazon EC2 instances
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Loading your Chef infrastructure from a file with spiceweasel and knife
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Index
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Index

Using libraries

You can use arbitrary Ruby code within your recipes. As long as your logic isn't too complicated, it's totally fine to keep it inside your recipe. However, as soon as you start using plain Ruby more than Chef DSL, it's time to the move logic into external libraries.

Libraries provide a place to encapsulate Ruby code so that your recipes stay clean and neat.

In this section, we'll create a simple library to see how this works.

Getting ready

Make sure you have a cookbook called my_cookbook and that the run_list of your node includes my_cookbook, as described in Creating and using cookbooks recipe of Chapter 1, Chef Infrastructure.

How to do it...

Let's create a library and use it in a cookbook:

  1. Create a helper method in your own cookbook's library:

    mma@laptop:~/chef-repo $ mkdir -p cookbooks/my_cookbook/libraries
mma@laptop:~/chef-repo $ subl cookbooks/my_cookbook/libraries/ipaddress.rb

    class Chef::Recipe
  def netmask(ipaddress)
    IPAddress(ipaddress).netmask
  end
end

  2. Use your...

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