Book Image

Learning DevOps - Second Edition

By : Mikael Krief
Book Image

Learning DevOps - Second Edition

By: Mikael Krief

Overview of this book

In the implementation of DevOps processes, the choice of tools is crucial to the sustainability of projects and collaboration between developers and ops. This book presents the different patterns and tools for provisioning and configuring an infrastructure in the cloud, covering mostly open source tools with a large community contribution, such as Terraform, Ansible, and Packer, which are assets for automation. This DevOps book will show you how to containerize your applications with Docker and Kubernetes and walk you through the construction of DevOps pipelines in Jenkins as well as Azure pipelines before covering the tools and importance of testing. You'll find a complete chapter on DevOps practices and tooling for open source projects before getting to grips with security integration in DevOps using Inspec, Hashicorp Vault, and Azure Secure DevOps kit. You'll also learn about the reduction of downtime with blue-green deployment and feature flags techniques before finally covering common DevOps best practices for all your projects. By the end of this book, you'll have built a solid foundation in DevOps and developed the skills necessary to enhance a traditional software delivery process using modern software delivery tools and techniques.
Table of Contents (25 chapters)
1
Section 1: DevOps and Infrastructure as Code
7
Section 2: DevOps CI/CD Pipeline
11
Section 3: Containerized Microservices with Docker and Kubernetes
14
Section 4: Testing Your Application
18
Section 5: Taking DevOps Further/More on DevOps

Writing Packer templates with HCL format

Since the release of version 1.5.0 of Packer, it's possible to write Packer templates using HCL format, which we learned in detail in Chapter 2, Provisioning Cloud Infrastructure with Terraform.

Note

The HCL integration in Packer is currently in Beta, and will be preferred by HashiCorp from version 1.7.0.

The HCL format of the template is very similar to the JSON format and it's composed of variable, source, build, and provisioner blocks. The following code shows the structure of the HCL Packer template.

For writing an HCL template, create a file, .pkr.hcl, that contains all the following code:

packer {
     required_plugins 
     {  
       azure = 
       {      
          version = ">= 1.0.0"
&...