By Jon Cowie
Benefit from Chef's hugely customizable layout to take on particular automation concerns that you simply cannot clear up via easily utilizing Chef's instruments, assets, and companies out of the field. With this sensible consultant, you are going to study the interior constitution of this configuration administration expertise and examine the place, how, and why so as to add customized code. writer Jon Cowie not just offers code snippets and functional recommendation for customizing Chef, but additionally is helping you establish case through case no matter if it really is on your top pursuits to customise in any respect. when you've got intermediate-to-advanced Chef event, this publication is necessary.
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Additional resources for Customizing Chef: Getting the Most Out of Your Infrastructure Automation
Please see “Chef In‐ stallation Types and Limitations” on page 18 for more details. How Do We Simplify Our Recipes to Reduce the Amount of Replicated Code? The team at AwesomeInc are looking to improve both the modularity and the simplicity of their infrastructure code. As we’ve already seen, Chef provides building blocks and tools to let you automate your infrastructure however you want. Out of the box it pro‐ vides resources for a number of operations, from configuring users through download‐ ing remote files to managing packages and services.
Or anyone else for that matter about what adds value to your particular company. This is worth remembering, as it is the principal reason that Chef, Inc. will not typically advocate particular workflows or tooling combinations as the “canonical” Chef way of doing things, and also the reason that I will not do so in this book. The instant a meth‐ odology or technique is declared canonical, anything else is considered to be wrong— even if it might be what makes the most sense for your particular use case.
Handlers are typically integrated with the chef-client run process and are called depending on whether or not errors occurred during the Chef run, as shown in Figure 1-1. info Figure 1-1. Chef handler flow There are two main types of handler: Report handlers As shown in Figure 1-1, report handlers are used to carry out actions when the chef-client run has succeeded without error. Exception handlers As shown in Figure 1-1, exception handlers are used to carry out actions when an error has occurred during the chef-client run that cannot be recovered from.