Download Customizing Chef by Jon Cowie PDF

By Jon Cowie

Make the most of Chef's hugely customizable layout to take on particular automation matters that you just can't remedy through easily utilizing Chef's instruments, assets, and companies out of the field. With this sensible advisor, you'll study the interior constitution of this configuration administration expertise and study the place, how, and why so as to add customized code.

Author Jon Cowie not just presents code snippets and sensible recommendation for customizing Chef, but additionally is helping you identify case via case even if it's on your top pursuits to customise in any respect. when you've got intermediate-to-advanced Chef event, this publication is indispensable.

•Explore Chef's common setups and why you'd are looking to customise them
•Learn the Ruby thoughts had to write customizations
•Customize the Chef run technique and discover Chef's inner classes
•Gain extra perception into your Chef runs via handlers and Chef's occasion stream
•Level up your Chef recipes by way of writing your individual assets and providers
•Create and expand plugins for Knife—Chef's command-line tool
•Interact with the Chef API to write down scripts and reports
•Learn how you can give a contribution customizations to the Chef community

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Extra resources for Customizing Chef

Sample text

So I propose a pact. I promise to do my best to write an interesting, relevant book that is full of helpful information, useful code snippets, and practical advice for how to approach customizing Chef. And in turn, after I’ve armed you with all of the knowledge and techniques that I can, you promise to carefully look at the problems you’re trying to solve and think critically about the best way to do that. What I’m asking you to consider when looking at customizing your Chef setup is not whether you can do something, but whether you should.

In Ruby, a call to a method of an object is always indicated by the . syntax seen here. rb foo class: String bar class: String true When this code is run, the Ruby interpreter creates two variables, foo and bar, which hold references to String objects. It puts a string containing some interpolated Ruby that calls the class method of the String object (all object types in Ruby have this method, and it does exactly what you might expect: returns the object’s class), then puts whether or not foo and bar have equal values.

26 | Chapter 2: Just Enough Ruby to Customize Chef As far as the Ruby interpreter is concerned, this long-form example above is identical to the first simple example we looked at. rb. Example 2-1. class this means that we’re calling the class method of the variable foo, which is a String object. In Ruby, a call to a method of an object is always indicated by the . syntax seen here. rb foo class: String bar class: String true When this code is run, the Ruby interpreter creates two variables, foo and bar, which hold references to String objects.

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