August 2017
Intermediate to advanced
427 pages
9h 12m
English
Content preview from Ansible: Up and Running, 2nd Edition
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Chapter 16. 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, I’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 [check out the repository on the host] ************************************* fatal: [web]: FAILED! => {"changed": false, "cmd": "/usr/bin/git clone --origin o rigin '' /home/vagrant/mezzanine/mezzanine_example", "failed": true, "msg": "Clon ing into '/home/vagrant/mezzanine/mezzanine_example'...\nPermission denied (publi ckey).\r\nfatal: Could not read from remote repository.\n\nPlease make sure you h ave the correct access rights\nand the repository exists.", "rc": 128, "stderr": "Cloning into '/home/vagrant/mezzanine/mezzanine_example'...\nPermission 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" : ["Cloning into '/home/vagrant/mezzanine/mezzanine_example'...", "Permission den ied (publickey).", "fatal: Could not read from remote repository.", "", "Please m ake 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.