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)

12: Docker overlay networking

Overlay networks are at the beating heart of many cloud-native microservices apps. In this chapter we’ll cover the fundamentals of native Docker overlay networking.

Docker overlay networking on Windows has feature parity with Linux. This means the examples we’ll use in this chapter will all work on Linux and Windows.

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

  • The TLDR
  • The deep dive
  • The commands

Let’s do some networking magic.

Docker overlay networking - The TLDR

In the real world, it’s vital that containers can communicate with each other reliably and securely, even when they’re on different hosts that are on different networks. This is where overlay networking comes in to play. It allows you to create a flat, secure, layer-2 network, spanning multiple hosts. Containers connect to this and can communicate directly.

Docker offers native overlay networking that is simple to configure and secure...