Book Image

Docker Deep Dive - Second Edition

By : Nigel Poulton
5 (1)
Book Image

Docker Deep Dive - Second Edition

5 (1)
By: Nigel Poulton

Overview of this book

Most applications, even the funky cloud-native microservices ones, need high-performance, production-grade infrastructure to run on. Having impeccable knowledge of Docker will help you thrive in the modern cloud-first world. With this book, you will gain the skills you need in order to work with Docker and its containers. The book begins with an introduction to containers and explains their functionality and application in the real world. You will then get an overview of VMware, Kubernetes, and Docker and learn to install Docker on Windows, Mac, and Linux. Once you have understood the Ops and Dev perspective of Docker, you will be able to see the big picture and understand what Docker exactly does. The book then turns its attention to the more technical aspects, guiding you through practical exercises covering Docker engine, Docker images, and Docker containers. You will learn techniques for containerizing an app, deploying apps with Docker Compose, and managing cloud-native applications with Swarm. You will also build Docker networks and Docker overlay networks and handle applications that write persistent data. Finally, you will deploy apps with Docker stacks and secure your Docker environment. By the end of this book, you will be well-versed in Docker and containers and have developed the skills to create, deploy, and run applications on the cloud.
Table of Contents (2 chapters)

13: Volumes and persistent data

Stateful applications that persist data are more and more important in the world of cloud-native and microservices applications. So, we’ll turn our attention in this chapter to investigating how Docker handles applications that write persistent data.

We’ll split the chapter into the usual three parts:

  • The TLDR
  • The deep dive
  • The commands

Volumes and persistent data - The TLDR

There are two main categories of data — persistent and non-persistent.

Persistent is the data we need to keep. Things like customer records, financial data, research results, audit logs, and even some types of application log data. Non-persistent is the data we don’t need to keep.

Both are important, and Docker has solutions for both.

To deal with non-persistent data, every Docker container gets its own non-persistent storage. This is automatically created for every container and is tightly coupled to the lifecycle of the container. As a...