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)

12: Docker overlay networking

Overlay networks are at the center of most cloud-native microservices apps. In this chapter we’ll get you up-to-speed with overlay networking on Docker.

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 reliably and securely, even when they’re on different hosts that are on different networks. This is where overlay networks come into play. They create a flat, secure, layer 2 networks spanning multiple hosts. Containers on different hosts can connect to the same overlay network and communicate directly.

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