August 2015
Intermediate to advanced
168 pages
3h 32m
English
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The best practices for variable usage
Overwhelming, eh? Do not worry. We will give you the recommendations on the best practices while using variables:
- Start with defaults in a role. This has the lowest precedence of all. This is also a good place to provide the sane defaults of your application, which can be later overridden from various places.
- Group variables are very useful. A lot of the time we will do region-specific or environment-specific configurations. We would also apply certain roles to a certain group of servers, for example, for all web servers in Asia, we apply the Nginx role. There is also a default group by the name "
all", which will contain all the hosts for all groups. It's a good practice to put the variables common for all groups ...
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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.