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

Functional testing using assert


The check mode will only work when you want to check whether a task will change anything on the host or not. This will not help when you want to check whether the output of your module is what you expected. For example, let's say you wrote a module that will check if a port is up or not. In order to test this, you might need to check the output of your module and see whether it matches the desired output or not. To perform such tests, Ansible provides a way to directly compare the output of a module with the desired output.

Let's see how this works creating the file playbooks/assert_ls.yaml with the following content:

    - hosts: localhost 
      tasks: 
      - name: List files in /tmp 
        command: ls /tmp 
        register: list_files 
      - name: Check if file testfile.txt exists 
        assert: 
          that: 
          - "'testfile.txt' in list_files.stdout_lines" 

In the preceding playbook, we're...