August 2015
Intermediate to advanced
168 pages
3h 32m
English
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Chapter 3. Separating Code and Data – Variables, Facts, and Templates
In the previous chapter, we looked at how to write a role to provide modularity and abstraction. While doing so, we created the configuration file and copied the file over to the destination host using Ansible's copy module.
In this chapter, we will cover the following concepts:
- How do you separate data from code?
- What are Jinja2 templates? How are these created?
- What are variables? How and where are they used?
- What are system facts? How are they discovered?
- What are the different types of variables?
- What is a variable merge order? What are its precedence rules?
Static content explosion
Let's imagine that we are managing a cluster of hundreds of web servers spanning across multiple data ...
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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.