Book Image

Ansible Playbook Essentials

By : Gourav Shah, GOURAV JAWAHAR SHAH
Book Image

Ansible Playbook Essentials

By: Gourav Shah, GOURAV JAWAHAR SHAH

Overview of this book

Ansible Playbook Essentials will show you how to write a blueprint of your infrastructure, encompassing multitier applications using Ansible's playbooks. Beginning with basic concepts such as plays, tasks, handlers, inventory, and YAML Ain't Markup Language (YAML) syntax that Ansible uses, you'll understand how to organize your code into a modular structure. Building on this, you will study techniques to create data-driven playbooks with variables, templates, logical constructs, and encrypted data, which will further strengthen your application skills in Ansible. Adding to this, the book will also take you through advanced clustering concepts, such as discovering topology information about other nodes in the cluster and managing multiple environments with isolated configurations. As you approach the concluding chapters, you can expect to learn about orchestrating infrastructure and deploying applications in a coordinated manner. By the end of this book, you will be able to design solutions to your automation and orchestration problems using playbooks quickly and efficiently.
Table of Contents (20 chapters)
Ansible Playbook Essentials
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Setting Up the Learning Environment
References
Index

Creating MySQL databases and user accounts


WordPress is a content management system that requires a MySQL DB to be available to store data, such as posts, users, and so on. Additionally, it also requires a MySQL user with appropriate privileges to connect to the database from a WordPress application. We get one admin user while installing MySQL, however, it's a good practice to create an additional user account and grant privileges to the user as and when required.

Creating a hash

A hash, an abbreviation of hash table, is a dictionary of key-value pairs. It's a useful data structure to create a multilevel variable, which can then be programmatically to create multiple objects, each having their own values. We will define the databases and users as dictionary items in the group_vars/all file, as follows:

#filename: group_vars/all
mysql_bind:  "{{ ansible_eth0.ipv4.address }}"
mysql:
  databases:
    fifalive:
      state: present
    fifanews:
      state: present
  users:
    fifa:
      pass...