May 2015
Intermediate to advanced
278 pages
5h 34m
English
Content preview from Chef Infrastructure Automation Cookbook Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Making recipes idempotent by using conditional execution
Chef manages the configuration of your nodes. It is not simply an installer for new software but you will run the Chef client on the existing nodes, as well as new ones.
To speed up your Chef client runs on the existing nodes, you should make sure that your recipes do not try to re-execute resources, which have already reached the desired state.
Running resources repeatedly will be a performance issue at best and will break your servers at worst. Chef offers a way to tell resources not to run or only to run if a certain condition is met. Let's take a look at how conditional execution of resources works.
Getting ready
Make sure you have a cookbook called my_cookbook and that the run_list of your ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.