By Jon Cowie
Make the most of Chef's hugely customizable layout to take on particular automation matters that you simply cannot clear up by means of easily utilizing Chef's instruments, assets, and companies out of the field. With this sensible consultant, you will research the interior constitution of this configuration administration know-how and examine the place, how, and why so as to add customized code. writer Jon Cowie not just offers code snippets and useful recommendation for customizing Chef, but additionally is helping you identify case by means of case no matter if it is on your top pursuits to customise in any respect. when you have intermediate-to-advanced Chef adventure, this publication is integral.
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Additional info for Customizing Chef: Getting the Most Out of Your Infrastructure Automation
Puts is a Ruby function that prints a String to the console followed by a newline, unless the specified string already ends with a new‐ line. If the object passed to puts is not a String, it will be converted to one. class}" will print foo class: String to the console. The idea that variables only store references to objects holds true for the majority of object types you’ll encounter in Ruby—we’ll touch on one exception to this rule further on in the chapter. Ruby Is Dynamically Typed So now we know what is meant when we say that Ruby is an “object-oriented” pro‐ gramming language.
New. In this case, our initialize method takes one parameter, awe some_level. Inside the body of the method, we’re assigning the value of this parameter to a class instance variable named @awesome_level (that’s what the @ means). We’ll go into more detail about the different sorts of variable scopes you can use in “Variable Scoping” on page 33, but for now it’s sufficient to say that the parameter is only accessible (“in scope,” to use the correct terminology) inside the method it was passed to, whereas the class instance variable is in scope to any methods in an instances of that class.
It will also log full stack traces in the event of a run failure. chef-irc-snitch chef-irc-snitch is an exception handler that sends notifications of Chef run failures to an IRC channel, complete with a GitHub gist containing node information, the exception message itself, and the backtrace to assist in debugging. Recipes and Resources In addition to publishing cookbooks on Chef Supermarket, a number of community members have created open source libraries and providers that are more generally useful to the community than to users of a specific cookbook.