February 2016
Intermediate to advanced
276 pages
5h 46m
English
Content preview from Mastering Puppet - 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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Dealing with exceptions
In a pristine environment, all your nodes with a certain role would be identical in every way and there would be no exceptions. Unfortunately, dealing with exceptions is a large part of the day-to-day business of running Puppet. It is possible to remove node level data from your code using roles and profiles together with Hiera, (roles, profiles, and modules).
Hiera can be used to achieve this separation of code from data. In Chapter 2, Organizing Your Nodes and Data, we configured hiera.yaml with roles/%{::role} in the hierarchy. The defaults for any role will be put in hieradata/roles/[rolename].yaml. The hierarchy determines the order in which files are searched for Hiera data. Our configuration is as follows:
--- :hierarchy: ...
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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.