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 an Nginx role


We will now create a separate role for Nginx and move the previous code that we wrote in the simple_playbook.yml file to it, as follows:

  1. Create the directory layout for the Nginx role:

    $ mkdir roles/nginx
    $ cd roles/nginx
    $ mkdir tasks meta files
    $ cd tasks
    
  2. Create the install.yml file inside roles/base. Move the Nginx-related tasks to it. It should look like this:

    ---
     - name: add official nginx repository
       apt_repository: repo='deb http://nginx.org/packages/ubuntu/ lucid nginx'
     - name: install nginx web server and ensure its at the latest version
       apt: name=nginx state=latest force=yes
  3. We will also create the service.yml file to manage the state of the Nginx daemon:

    ---
     - name: start nginx service
       service: name=nginx state=started
  4. We looked at the include directive earlier. We will use it to include both the install.yml and service.yml files in the main.yml file, as follows:

    ---
    # This is main tasks file for nginx role
     - include: install.yml
    - include: service...