August 2015
Intermediate to advanced
144 pages
2h 58m
English
Content preview from Troubleshooting PuppetBecome 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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External node classifiers – ENCs
ENCs are used to assign classes, parameters, and an environment to nodes. The output of an ENC must either be valid YAML or nothing. The simplest type of ENC is a script that is written using the exec node terminus, which executes the script that is pointed to by the external_nodes setting in puppet.conf.
When using the exec terminus, the exit code of the script should be zero, unless there is a problem executing the script.
When Puppet is configured to use an ENC, the output of the ENC is merged with the output from your site.pp file. This can be a problem when you are debugging. After a successful catalog compile and agent run, the classes.txt file will contain a list of all the classes that were applied to the ...
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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.