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

Understanding the Terraform life cycle with different command-line options

We have just discovered that applying changes to a piece of infrastructure with Terraform is mainly done using three commands. They include the init, plan, and apply commands. However, Terraform has other very practical and important commands that can be used to best manage the life cycle of our infrastructure, and the question of how to execute Terraform in an automation context such as a CI/CD pipeline must also be considered.

Among the other operations that can be done on a piece of infrastructure is the cleaning up of resources by removing them. This is done to either better rebuild or remove temporary infrastructure.

Using destroy to better rebuild

One of the steps in the life cycle of infrastructure that is maintained by IaC is the removal of the infrastructure; do not forget that one of the objectives and benefits of IaC is to be able to make rapid changes to infrastructure but also create environments...