Summary
We started this chapter by learning about why and how to separate data from code using Ansible variables, facts, and Jinja2 templates. You learnt how to create data-driven roles by providing variables and facts in templates, tasks, handlers, and playbooks. Additionally, we created a new role for the database tier, which supports both the Debian and RedHat families of operating systems. You learnt what system facts are and how they are discovered and used. You learnt how variables can be specified from more than one place, how they are merged, and the precedence rules. Finally, you learnt about the best practices for using variables.
In the next chapter, we will work with custom commands and scripts, understand what registered variables are, and deploy a sample WordPress application using all this information.
