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)

11: Docker Networking

It’s always the network!

Any time there’s a 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 — really 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 some 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 over lots of different networks. This means Docker needs strong networking capabilities.

Fortunately, Docker has solutions for container-to-container networks, as well as connecting to existing networks and VLANs. The latter...