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

Introducing Docker storage drivers and volumes

Docker containers are ephemeral workloads. That means whatever data you store on your container filesystem gets wiped out once the container is gone. The data lives on a disk during the container life cycle, but it does not persist beyond it. Pragmatically speaking, most applications in the real world are stateful. They need to store data beyond the container life cycle, and they want data to persist.

So, how do we go along with that? Docker provides several ways you can store data. By default, all data is stored on the writable container layer, which is ephemeral. The writable container layer interacts with the host filesystem via a storage driver. Because of the abstraction, writing files to the container layer is slower than writing directly to the host filesystem.

To solve that problem and also provide persistent storage, Docker provides volumes, bind mounts, and tmpfs. With them, you can interact directly with the host filesystem...