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

Setting up Ansible

We need to set up and install Ansible in the control node, but before we do that, we will have to spin three servers to start the activity – an Ansible control node and two managed nodes.

Setting up inventory

The idea is to set up a two-tier architecture with Apache and MySQL. So let's use Terraform to spin up the three servers.

Let's first cd into the directory where the Terraform templates are located, and then edit the terraform.tfvars file to fill in the required details. (Please refer to Chapter 6, Infrastructure as Code (IaC) with Terraform, for more details about how to get the attributes):

$ cd ~/modern-devops/ch7/setup-ansible-terraform
$ vim terraform.tfvars

Then, use the following commands to spin up the servers using Terraform:

$ terraform init
$ terraform plan -out ansible.tfplan
$ terraform apply ansible.tfplan

Once we have the terraform apply command completed successfully, we will see three servers – ansible...