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Mastering Chef

You're reading from   Mastering Chef Build, deploy, and manage your IT infrastructure to deliver a successful automated system with Chef in any environment

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781783981564
Length 374 pages
Edition 1st Edition
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Author (1):
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Mayank Joshi Mayank Joshi
Author Profile Icon Mayank Joshi
Mayank Joshi
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Table of Contents (15) Chapters Close

Preface 1. Introduction to the Chef Ecosystem FREE CHAPTER 2. Knife and Its Associated Plugins 3. Chef and Ruby 4. Controlling Access to Resources 5. Starting the Journey to the World of Recipes 6. Cookbooks and LWRPs 7. Roles and Environments 8. Attributes and Their Uses 9. Ohai and Its Plugin Ecosystem 10. Data Bags and Templates 11. Chef API and Search 12. Extending Chef 13. (Ab)Using Chef Index

Extending Chef to bootstrap distributed systems

Most configuration management systems such as Chef, Puppet, CFEngine, Ansible, and so on, operate at a node level, and any configuration change that is required to be made is applied only upon the convergence runs that happen at the scheduled intervals and aren't event-based. For example, say you've a setup comprising of a load balancer (say HAProxy) and web servers. Now, you are running a website and you want to ensure that as soon as the traffic spikes up, you should be able to provision a new web server.

You've written the HAProxy cookbook so that it searches for nodes of type webserver, populates its config, and reloads the HAProxy process. You've also written the Chef code to bring up the web server; however, even once the server is up and running, your load balancer has no knowledge of this and either you have to manually trigger the chef-client run, or if you are running a chef-client as a daemon or cron job, you...

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