Introduction to Ansible Transcripts
Chapter: Ansible Core Concepts
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0:00 YAML is a recursive acronym that stands for YAML Ain't Markup Language. That's probably just going to be trivia for you
0:07 hardly anyone ever says anything other than YAML when referring to this markup style. This is the last of the core concepts
0:13 we're going to introduce for now so that we can get started writing our playbooks and getting comfortable actually using Ansible.
0:18 There will be other concepts that will be introduced along the way but this is the last of them that we need in order to get started
0:23 because these are the key words we're going to be using constantly to describe what we're doing. We've already seen an example of
0:29 an Ansible task written in YAML Here's what it looks like again. Let's highlight the important parts
0:33 when it comes to the YAML format versus the task itself. Now, on the first line, we have a hyphen and then a space and then a key.
0:40 The key in this case is name with a colon after it and then a value and the value in this case is ensure git is installed.
0:48 And thinking in key-value pairs is basically the core idea with YAML. Even on this next line, which looks more complicated
0:54 the key is apt, and the value itself is just three key-value pairs. The key of name is equal to git-core
1:00 that's the name of the package that we want to install. The key of state and the value of present indicating that we want
1:05 the get core package to be installed. The key of update_cache and the value of yes which tells apt that we want to update
1:13 the versions package in the package manager before we install anything. And then, on this last line, become true key of become and the value of true
1:20 indicating that we want to use our super user privileges in order to execute this task. One thing to note is that spacing is required for the syntax.
1:28 It's not just to make our tasks easier to read which it certainly does. There are two spaces before apt. There are two spaces before become.
1:35 The spacing indicates that the second and third lines are grouped together with the first line. If you were to indent or remove the indentation
1:42 from the second or third lines it would no longer be valid syntax for Ansible. So that's what YAML looks like.
1:47 That's why the spacing is as you see it in this example. And we're going to be writing a whole lot of YAML in all of our playbooks
1:53 to configure servers and play applications.