Book Image

Modern DevOps Practices

By : Gaurav Agarwal
Book Image

Modern DevOps Practices

By: Gaurav Agarwal

Overview of this book

Containers have entirely changed how developers and end-users see applications as a whole. With this book, you'll learn all about containers, their architecture and benefits, and how to implement them within your development lifecycle. You'll discover how you can transition from the traditional world of virtual machines and adopt modern ways of using DevOps to ship a package of software continuously. Starting with a quick refresher on the core concepts of containers, you'll move on to study the architectural concepts to implement modern ways of application development. You'll cover topics around Docker, Kubernetes, Ansible, Terraform, Packer, and other similar tools that will help you to build a base. As you advance, the book covers the core elements of cloud integration (AWS ECS, GKE, and other CaaS services), continuous integration, and continuous delivery (GitHub actions, Jenkins, and Spinnaker) to help you understand the essence of container management and delivery. The later sections of the book will take you through container pipeline security and GitOps (Flux CD and Terraform). By the end of this DevOps book, you'll have learned best practices for automating your development lifecycle and making the most of containers, infrastructure automation, and CaaS, and be ready to develop applications using modern tools and techniques.
Table of Contents (19 chapters)
1
Section 1: Container Fundamentals and Best Practices
7
Section 2: Delivering Containers
15
Section 3: Modern DevOps with GitOps

Introduction to Ansible playbooks

Ansible playbooks are a collection of Ansible tasks to produce the desired configuration within target managed nodes. They have the following features:

  • They help in managing configuration within multiple remote servers using declarative steps.
  • They use a sequential list of idempotent steps and steps that match the expected configuration are not applied again.
  • The tasks within the playbook can be synchronous and asynchronous.
  • They enable GitOps by allowing the steps to be stored using a simple YAML file to keep in source control, providing configuration management as code (CaC).

Ansible playbooks consist of multiple plays, and each play is mapped to a group of hosts using a role and consists of a series of tasks required to achieve them, something like the following diagram:

Figure 7.2 – Playbooks

The following is an example of a simple playbook that pings all servers.

Create a file called...