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

Tagging the roles


Let's now start tagging the roles we created earlier. We will create the following tags that map to the phases the applications are managed in:

  • Install

  • Configure

  • Start

Here is an example of adding tags to the haproxy role. Tagging other roles is excluded from the text to avoid redundancy. We can either add tags to the tasks inside the role or tag the complete roles in a playbook. Let's begin by tagging tasks:

---
# filename: roles/haproxy/tasks/install.yml
  - name: install haproxy
    apt:
      name: "{{ haproxy['pkg'] }}"
    tags:
     - install

---
# filename: roles/haproxy/tasks/configure.yml
 - name: create haproxy config
    template: src="haproxy.cfg.j2" dest="{{ haproxy['config']['cnfpath'] }}" mode=0644
   notify:
    - restart haproxy service
   tags:
    - configure

 - name: enable haproxy
    template: src="haproxy.default.j2" dest=/and more/default/haproxy mode=0644
    notify:
    - restart haproxy service
    tags:
    - configure

---
# filename: roles/haproxy...