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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
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
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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

In-place upgrades

The first type of deployment we'll cover is in-place upgrades. This style of deployment operates on infrastructure that already exists in order to upgrade the existing application. This model can be seen as a traditional model that existed when the creation of new infrastructure was a costly endeavor in terms of both time and money.

To minimize the downtime during this type of an upgrade, a general design pattern is to deploy the application across multiple hosts behind a load balancer. The load balancer will act as a gateway between users of the application and the servers that run the application. Requests for the application will come to the load balancer, and depending on configuration, the load balancer will decide which backend server to direct the request to.

To perform a rolling in-place upgrade of an application deployed with this pattern, each server (or a small subset of the servers) will be disabled at the load balancer, upgraded, and then re-enabled to take on...

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