What are playbooks, roles, and modules?

The automation code you will create to be run by Ansible is broken down in hierarchical layers. Envision a pyramid with its multiple levels of elevation. We will start at the top and discuss playbooks first.

Playbooks

Imagine that a playbook is the very topmost triangle of the pyramid. A playbook takes on the role of executing all of the lower level code contained in a role. It can also be seen as a wrapper to the roles created. We will cover the roles in the next section.

Playbooks also contain other high-level runtime parameters, such as the host(s) to run the playbook against, the root user to use, and/or if the playbook needs to be run as a sudo user. These are just a few of the many playbook parameters you can add. Following is an example of what the syntax of a playbook looks like:

--- 
# Sample playbooks structure/syntax. 
 
- hosts: dbservers 
 remote_user: root 
 become: true 
 roles: 
  - mysql-install 
...