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Mastering Ansible

Mastering Ansible

4.6 (15)
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Mastering Ansible

Mastering Ansible

4.6 (15)

Overview of this book

Automation is critical to success in the world of DevOps. How quickly and efficiently an application deployment can be automated, or a new infrastructure can be built up, can be the difference between a successful product or a failure. Ansible provides a simple yet powerful automation engine. Beyond the basics of Ansible lie a host of advanced features which are available to help you increase efficiency and accomplish complex orchestrations with ease. This book provides you with the knowledge you need to understand how Ansible works at a fundamental level and leverage its advanced capabilities. You'll learn how to encrypt Ansible content at rest and decrypt data at runtime. You will master the advanced features and capabilities required to tackle the complex automation challenges of today and beyond. You will gain detailed knowledge of Ansible workflows, explore use cases for advanced features, craft well thought out orchestrations, troubleshoot unexpected behaviour, and extend Ansible through customizations. Finally, you will discover the methods used to examine and debug Ansible operations, helping you to understand and resolve issues.
Table of Contents (10 chapters)
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Developing dynamic inventory plugins


Inventory plugins are bits of code that will create inventory data for an Ansible execution. In many environments, the simple ini file style inventory source and variable structure is not sufficient to represent the actual infrastructure being managed. In such cases, a dynamic inventory source is desired, one that will discover the inventory and data at runtime for every execution of Ansible. A number of these dynamic sources ship with Ansible, primarily to operate Ansible with the infrastructure built into one cloud computing platform or another. A short, incomplete list of dynamic inventory plugins that ship with Ansible includes:

  • apache-libcloud

  • cobbler

  • console_io

  • digital_ocean

  • docker

  • ec2

  • gce

  • libvirt_lxc

  • linode

  • openshift

  • openstack

  • rax

  • vagrant

  • vmware

  • windows_azure

An inventory plugin is essentially an executable script. Ansible calls the script with set arguments (--list or --host <hostname>) and expects JSON formatted output on...

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