July 2022
Intermediate to advanced
472 pages
10h 21m
English
Content preview from Ansible: Up and Running, 3rd Edition
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Chapter 8. Debugging Ansible Playbooks
Let’s face it: mistakes happen. Whether it’s a bug in a playbook or a config file on your control machine with the wrong configuration value, eventually something’s going to go wrong. In this chapter, we’ll review some techniques you can use to help track down those errors.
Humane Error Messages
When an Ansible task fails, the output format isn’t very friendly to any human reader trying to debug the problem. Here’s an example of an error message generated while working on this book:
TASK [mezzanine : check out the repository on the host] ************************ fatal: [web]: FAILED! => {"changed": false, "cmd": "/usr/bin/git ls-remote '' -h refs/heads/master", "msg": "Warning:********@github.com: Permission denied (publickey).\r\nfatal: Could not read from remote repository.\n\nPlease make sure you have the correct access rights\nand the repository exists.", "rc": 128, "stderr": "Warning: Permanently added 'github.com,140.82.121.4' (RSA) to the list of known hosts.\r\ngit@github.com: Permission denied (publickey).\r\nfatal: Could not read from remote repository.\n\nPlease make sure you have the correct access rights\nand the repository exists.\n", "stderr_lines": ["Warning: Permanently added 'github.com,140.82.121.4' (RSA) to the list of known hosts.", "git@github.com: Permission denied (publickey).", "fatal: Could not read from remote repository.", "", "Please make sure you have the correct access rights", "and the repository exists."], ...Become 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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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.