Book Image

Docker Deep Dive

By : Nigel Poulton
Book Image

Docker Deep Dive

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 to thrive in the modern cloud-first world. With this book, you’ll gain the skills you need to work with Docker and its containers. The book begins with an introduction to containers and explains its functionality and application in the real world. You’ll then get an overview of VMware, Kubernetes, and Docker and learn to install Docker on Windows, Mac, and Linux. Once you’ve understood the Ops and Dev perspective of Docker, you’ll 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 your through practical exercises covering Docker engine, Docker images, and Docker containers. You’ll learn techniques for containerizing an app, deploying apps with Docker Compose, and managing cloud-native applications with Swarm. You’ll also build Docker networks and Docker overlay networks and handle applications that write persistent data. Finally, you’ll deploy apps with Docker stacks and secure your Docker environment. By the end of this book, you’ll be well-versed in Docker and containers and have developed the skills to create, deploy, and run applications on the cloud.
Table of Contents (3 chapters)

13: Volumes and persistent data

Stateful applications that persist data are becoming more and more important in the world of cloud-native and microservices applications. Docker is an important infrastructure technology in this space, 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 you 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 you 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...