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  • Book Overview & Buying Mastering Ansible, Second Edition
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Mastering Ansible, Second Edition

Mastering Ansible, Second Edition

By : Keating
3.8 (8)
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Mastering Ansible, Second Edition

Mastering Ansible, Second Edition

3.8 (8)
By: Keating

Overview of this book

This book provides you with the knowledge you need to understand how Ansible 2.1 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. By the end of the book, the readers will be able to unlock the true power of the Ansible automation engine and will tackle complex real world actions with ease.
Table of Contents (10 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. System Architecture and Design of Ansible
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1. System Architecture and Design of Ansible
Ansible version and configuration
Inventory parsing and data sources
Playbook parsing
Module transport and execution
Variable types and location
Accessing external data
Variable precedence
Summary
2
2. Protecting Your Secrets with Ansible
2. Protecting Your Secrets with Ansible
Encrypting data at rest
Protecting secrets while operating
Summary
3
3. Unlocking the Power of Jinja2 Templates
3. Unlocking the Power of Jinja2 Templates
Control structures
Data manipulation
Comparing values
Summary
4
4. Controlling Task Conditions
4. Controlling Task Conditions
Defining a failure
Defining a change
Error recovery
Summary
5
5. Composing Reusable Ansible Content with Roles
5. Composing Reusable Ansible Content with Roles
Task, handler, variable, and playbook include concepts
Roles
Summary
6
6. Minimizing Downtime with Rolling Deployments
6. Minimizing Downtime with Rolling Deployments
In-place upgrades
Expanding and contracting
Failing fast
Minimizing disruptions
Serializing single tasks
Summary
7
7. Troubleshooting Ansible
7. Troubleshooting Ansible
Playbook logging and verbosity
Variable introspection
Debugging code execution
Summary
8
8. Extending Ansible
8. Extending Ansible
Developing modules
Developing plugins
Developing dynamic inventory plugins
Contributing to the Ansible project
Summary
9
9. Infrastructure Provisioning
9. Infrastructure Provisioning
Managing cloud infrastructure
Interacting with Docker containers
Previewing of Ansible container
Summary

Ansible version and configuration

It is assumed that you have Ansible installed on your system. There are many documents out there that cover installing Ansible in a way that is appropriate for the operating system and version that you might be using. This book will assume the use of the Ansible 2.2.x.x version. To discover the version in use on a system with Ansible already installed, make use of the version argument, that is, either ansible or ansible-playbook:

Ansible version and configuration

Note

Note that ansible is the executable for doing adhoc one-task executions and ansible-playbook is the executable that will process playbooks for orchestrating many tasks.

The configuration for Ansible can exist in a few different locations, where the first file found will be used. The search order changed slightly in version 1.5, with the new order being:

  • ANSIBLE_CFG: This is an environment variable
  • ~/ansible.cfg: This is in the current directory
  • ansible.cfg: This is in the user's home directory 
  • ./etc/ansible/ansible.cfg

Some installation methods may include placing a config file in one of these locations. Look around to check whether such a file exists and see what settings are in the file to get an idea of how Ansible operation may be affected. This book will assume no settings in the ansible.cfg file that would affect the default operation of Ansible.

End of Section 2
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