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

Ansible playbooks in action

Let's suppose you are creating an Apache server that serves a custom website. It also connects with a MySQL backend. In short, we are setting up a Linux, Apache, MySQL, and PHP (LAMP) stack using Ansible.

The following directory contains all resources for the exercises in this section:

$ cd ~/modern-devops/ch7/lamp-stack

We have created the following custom index.php page that tests the connection to the MySQL database and displays whether it can connect or not:

...
<?php
mysqli_connect('db', 'testuser', 'Password@1') or die('Could not connect the database : Username or password incorrect');
echo 'Database Connected successfully';
?>
...

We create several Ansible playbooks according to the logical steps we follow with configuration management.

It is an excellent practice to update the packages and repositories at the start of every configuration. Therefore, we need to start our...