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)

11: Docker Networking

It’s always the network!

Any time there’s an infrastructure problem, we always blame the network. Part of the reason is that networks are at the center of everything — no network, no app!

In the early days of Docker, networking was hard. These days, it’s almost a pleasure ;-)

In this chapter, we’ll look at the fundamentals of Docker networking. Things like the Container Network Model (CNM) and libnetwork. We’ll also get our hands dirty building and testing networks.

As usual, we’ll split the chapter into three parts:

  • The TLDR
  • The deep dive
  • The commands

Docker Networking - The TLDR

Docker runs applications inside of containers, and applications need to communicate with other application. Some of these other applications are containers and some aren’t. This means Docker needs strong networking capabilities.

Fortunately, Docker has solutions for container-to-container networks, as well as connecting...