Book Image

Learning Ansible 2 - Second Edition

Book Image

Learning Ansible 2 - Second Edition

Overview of this book

Ansible is an open source automation platform that assists organizations with tasks such as configuration management, application deployment, orchestration, and task automation. With Ansible, even complex tasks can be handled easier than before. In this book, you will learn about the fundamentals and practical aspects of Ansible 2 by diving deeply into topics such as installation (Linux, BSD, and Windows Support), playbooks, modules, various testing strategies, provisioning, deployment, and orchestration. In this book, you will get accustomed with the new features of Ansible 2 such as cleaner architecture, task blocks, playbook parsing, new execution strategy plugins, and modules. You will also learn how to integrate Ansible with cloud platforms such as AWS. The book ends with the enterprise versions of Ansible, Ansible Tower and Ansible Galaxy, where you will learn to interact Ansible with different OSes to speed up your work to previously unseen levels By the end of the book, you’ll able to leverage the Ansible parameters to create expeditious tasks for your organization by implementing the Ansible 2 techniques and paradigms.
Table of Contents (16 chapters)
Learning Ansible 2 Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

The check mode


The check mode (also known as the dry run or no-op mode) will run your playbook in a no-operation mode, that is, it will not apply any changes to the remote host; instead, it will just show the changes that will be introduced when a task is run. Whether the check mode is actually enabled or not depends on each task. There are few commands that you may find interesting. All those modules will have to be run in /usr/lib/python2.7/site-packages/ansible/modules or where your Ansible module folder is (different paths could be possible based on the operating system you are using as well as the way you installed Ansible).

To count the number of available modules on your installation, you can perform this command:

find . -type f | grep '.py$' | grep -v '__init__' | wc -l

With Ansible 2.1.1, the result of this command is 569, since Ansible has that many modules.

If you want to see how many of these support the check mode, you can run:

grep -r 'supports_check_mode=True' | awk -F: '{print...