book

Chef Infrastructure Automation Cookbook Second Edition

Name: Chef Infrastructure Automation Cookbook Second Edition
Author: Matthias Marschall
ISBN: 9781785287947

by Matthias Marschall

May 2015

Intermediate to advanced

278 pages

5h 34m

English

Packt Publishing

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Chef Infrastructure Automation Cookbook Second Edition
Table of Contents
Chef Infrastructure Automation Cookbook Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Support files, eBooks, discount offers, and moreWhy subscribe?Free access for Packt account holders
Preface
What this book covers
What you need for this book
Who this book is for

Sections
Getting readyHow to do it…How it works…There's more…See also
Conventions
Reader feedback
Customer support
ErrataPiracyQuestions
1. Chef Infrastructure
Introduction
Using version control
Getting readyHow to do it...How it works...There's more...See also
Installing the Chef development kit on your workstation
How to do it...How it works...See also
Using the hosted Chef platform
Getting readyHow to do it...How it works...There's more...See also
Managing virtual machines with Vagrant
Getting readyHow to do it...How it works...There's more...See also
Creating and using cookbooks
Getting readyHow to do it...How it works...See also
Inspecting files on your Chef server with knife
Getting readyHow to do it...How it works...There's more...See also
Defining cookbook dependencies
Getting readyHow to do it...How it works...There's more...See also
Managing cookbook dependencies with Berkshelf
Getting readyHow to do it...How it works...There's more...See also
Downloading and integrating cookbooks as vendor branches into your Git repository
Getting readyHow to do it...How it works...There's more...See also
Using custom knife plugins
Getting readyHow to do it...How it works...There's more...See also
Deleting a node from the Chef server
Getting readyHow to do it...How it works...There's more...See also
Developing recipes with local mode
Getting readyHow to do it...How it works...There's more...Running knife in local modeMoving to hosted Chef or your own Chef serverSee also
Using roles
Getting readyHow to do it...How it works...See also
Using environments
Getting readyHow to do it...How it works...There's more...See also
Freezing cookbooks
Getting readyHow to do it...How it works...There's more...See also
Running Chef client as a daemon
Getting readyHow to do it...How it works...There's more...
Using chef-shell
How to do it...How it works...There's more...See also
2. Evaluating and Troubleshooting Cookbooks and Chef Runs
Introduction
Testing your Chef cookbooks
Getting readyHow to do it...How it works...There's more...See also
Flagging problems in your Chef cookbooks
Getting readyHow to do it...How it works...There's more...See also
Test-driven development for cookbooks using ChefSpec
Getting readyHow to do it...How it works...There's more...See also
Integration testing your Chef cookbooks with Test Kitchen
Getting readyHow to do it...How it works...There's more...See also
Showing affected nodes before uploading cookbooks
Getting readyHow to do it...How it works...See also
Overriding a node's run list to execute a single recipe
Getting readyHow to do it...How it works...See also
Using why-run mode to find out what a recipe might do
Getting readyHow to do it...How it works...See also
Debugging Chef client runs
Getting readyHow to do it...How it works...There's more...See also
Inspecting the results of your last Chef run
Getting readyHow to do it...How it works...See also
Raising and logging exceptions in recipes
Getting readyHow to do it...How it works...There's more...See also
Diff-ing cookbooks with knife
Getting readyHow to do it...How it works...There's more...See also
Using community exception and report handlers
Getting readyHow to do it...How it works...There's more...See also
Creating custom handlers
Getting ready...How to do it...How it works...There's more...See also
3. Chef Language and Style
Introduction
Using community Chef style
Getting readyHow to do it...How it works...There's more...See also
Using attributes to dynamically configure recipes
Getting readyHow to do it...How it works...There's more...Calculating values in the attribute filesSee also
Using templates
Getting readyHow to do it...How it works...There's more...See also
Mixing plain Ruby with Chef DSL
Getting readyHow to do it...How it works...There's more...See also
Installing Ruby gems and using them in recipes
Getting readyHow to do it...How it works...See also
Using libraries
Getting readyHow to do it...How it works...There's more...See also
Using definitions
Getting readyHow to do it...How it works...There's more...See also
Creating your own Lightweight Resource Providers (LWRP)
Getting readyHow to do it...How it works...There's more...See also
Extending community cookbooks by using application wrapper cookbooks
Getting readyHow to do it...How it works...There's more...See also
Creating custom Ohai plugins
Getting readyHow to do it...How it works...There's more...See also
Creating custom knife plugins
Getting readyHow to do it...How it works...There's more...See also
4. Writing Better Cookbooks
Introduction
Setting the environment variables
Getting readyHow to do it...How it works...There's more...See also
Passing arguments to shell commands
Getting readyHow to do it...How it works...There's more...See also
Overriding attributes
Getting readyHow to do it...How it works...There's more...See also
Using search to find nodes
Getting readyHow to do it...How it works...There's more...Using knife to search for nodesSearching for arbitrary node attributesUsing Boolean operators in searchSee also
Using data bags
Getting readyHow to do it...How it works...See also
Using search to find data bag items
Getting readyHow to do it...How it works...There's more...See also
Using encrypted data bag items
Getting readyHow to do it...How it works...There's more...Using a private key fileSee also
Accessing data bag values from external scripts
Getting readyHow to do it...How it works...There's more...See also
Getting information about the environment
Getting readyHow to do it...How it works...There's more...See also
Writing cross-platform cookbooks
Getting readyHow to do it...How it works...There's more...Avoiding case statements to set values based on the platformDeclaring support for specific operating systems in your cookbook's metadataSee also
Finding the complete list of operating systems you can use in cookbooks
How to do it...How it works...There's more...See also
Making recipes idempotent by using conditional execution
Getting readyHow to do it...How it works...There's more...See also
5. Working with Files and Packages
Introduction
Creating configuration files using templates
Getting readyHow to do it...How it works...There's more...See also
Using pure Ruby in templates for conditionals and iterations
Getting readyHow to do it...How it works...There's more...See also
Installing packages from a third-party repository
Getting readyHow to do it...How it works...See also
Installing software from source
Getting readyHow to do it...How it works...There's more...See also
Running a command when a file is updated
Getting readyHow to do it...How it works...There's more...See also
Distributing directory trees
Getting readyHow to do it...How it works...There's more...See also
Cleaning up old files
Getting readyHow to do it...How it works...There's more...See also
Distributing different files based on the target platform
Getting readyHow to do it...How it works...See also
6. Users and Applications
Introduction
Creating users from data bags
Getting readyHow to do it...How it works...There's more...See also
Securing the Secure Shell Daemon (SSHD)
Getting readyHow to do it...How it works...There's more...See also
Enabling passwordless sudo
Getting readyHow to do it...How it works...There's more...See also
Managing NTP
Getting readyHow to do it...How it works...There's more...See also
Managing nginx
Getting readyHow to do it...How it works...There's more...See also
Creating nginx virtual hosts
Getting readyHow to do it...How it works...There's more...See also
Creating MySQL databases and users
Getting readyHow to do it...How it works...There's more...See also
Managing WordPress sites
Getting readyHow to do it...How it works...There's more...See also
Managing Ruby on Rails applications
Getting readyHow to do it...How it works...There's more...See also
Managing Varnish
Getting readyHow to do it...How it works...There's more...See also
Managing your local workstation
Getting readyHow to do it...How it works...There's more...See also
7. Servers and Cloud Infrastructure
Introduction
Creating your infrastructure using Chef Provisioning
Getting readyHow to do it...How it works...There's more...See also
Creating cookbooks from a running system with Blueprint
Getting readyHow to do it...How it works...There's more...See also
Running the same command on many machines at once
How to do it...How it works...There's more...See also
Setting up SNMP for external monitoring services
Getting readyHow to do it...How it works...There's more...See also
Deploying a Nagios monitoring server
Getting readyHow to do it...How it works...There's more...See also
Building high-availability services using heartbeat
Getting readyHow to do it...How it works...There's more...See also
Using HAProxy to load-balance multiple web servers
Getting readyHow to do it...How it works...See also
Using custom bootstrap scripts
Getting readyHow to do it...How it works...There's more...See also
Managing firewalls with iptables
Getting readyHow to do it...How it works...See also
Managing fail2ban to ban malicious IP addresses
Getting readyHow to do it...How it works...There's more...See also
Managing Amazon EC2 instances
Getting readyHow to do it...How it works...There's more...See also
Loading your Chef infrastructure from a file with spiceweasel and knife
Getting readyHow to do it...How it works...There's more...See also
Index

Content preview from Chef Infrastructure Automation Cookbook Second Edition

Using pure Ruby in templates for conditionals and iterations

Switching options on and off in a configuration file is a pretty common thing. Since Chef uses ERB as its template language, you can use pure Ruby to control the flow in your templates. You can use conditionals or even loops in your templates.

Getting ready

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

How to do it...

Let's create a hypothetical configuration file listing the IP addresses of a given set of backend servers. We only want to print that list and set a flag called enabled to true:

Edit your cookbook's default recipe:
```
mma@laptop:~/chef-repo ...
```

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