Book Image

Practical Ansible - Second Edition

By : James Freeman, Fabio Alessandro Locati, Daniel Oh
Book Image

Practical Ansible - Second Edition

By: James Freeman, Fabio Alessandro Locati, Daniel Oh

Overview of this book

Ansible empowers you to automate a myriad of tasks, including software provisioning, configuration management, infrastructure deployment, and application rollouts. It can be used as a deployment tool as well as an orchestration tool. While Ansible provides simple yet powerful features to automate multi-layer environments using agentless communication, it can also solve other critical IT challenges, such as ensuring continuous integration and continuous deployment (CI/CD) with zero downtime. In this book, you'll work with the latest release of Ansible and learn how to solve complex issues quickly with the help of task-oriented scenarios. You'll start by installing and configuring Ansible on Linux and macOS to automate monotonous and repetitive IT tasks and learn concepts such as playbooks, inventories, and roles. As you progress, you'll gain insight into the YAML syntax and learn how to port between Ansible versions. Additionally, you'll understand how Ansible enables you to orchestrate multi-layer environments such as networks, containers, and the cloud. By the end of this Ansible book, you'll be well versed in writing playbooks and other related Ansible code to overcome all your IT challenges, from infrastructure-as-a-code provisioning to application deployments and handling mundane day-to-day maintenance tasks.
Table of Contents (21 chapters)
Free Chapter
1
Part 1:Learning the Fundamentals of Ansible
6
Part 2:Expanding the Capabilities of Ansible
12
Part 3:Using Ansible in an Enterprise

Automating Docker and Podman with Ansible

In today’s world, simply being able to run an image is not considered a production-ready setup.

To be able to call a deployment production-ready, you need to demonstrate that the service your application delivers will run reasonably, even in the case of a single application crash, as well as hardware failure. Often, you’ll have even more reliability constraints from your customer.

Luckily, your software is not the only one that has those requirements, so orchestration solutions have been developed for this purpose.

Today, the most successful one is Kubernetes, due to its various distributions/versions, so we are going to focus on it primarily.

The idea of Kubernetes is that you inform the Kubernetes control plane that you want X number of instances of Y application. Kubernetes will count how many instances of Y application are running on the Kubernetes Nodes to ensure that the number of instances is X. If there are...