October 2017
Intermediate to advanced
326 pages
7h 20m
English
Content preview from Implementing Modern DevOps
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Flow control
In Ansible, it is possible to use flow control statements such as loops or conditionals using variables as input. This can be used to repeat tasks on a certain dataset and avoid executing some tasks if a few conditions are not met: we might want to use different commands depending on the underlying system of our server.
We have already seen an example of conditionals using the when clause in our previous examples, but let's explain it a bit more:
---- hosts: all user: root tasks: - command: /bin/false register: result ignore_errors: True - debug: msg="fail!" when: result|failed - debug: msg="success!" when: result|succeeded
The preceding code is very easy to read: a command is executed (ignoring the potential errors so our playbook ...
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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.