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)

9: Multi-container apps with Compose

In this chapter, we’ll look at how to deploy multi-container applications using Docker Compose. We usually shorten it to just Compose.

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

  • The TLDR
  • The deep dive
  • The commands

Deploying apps with Compose - The TLDR

Modern cloud-native apps are made of multiple smaller services that interact to form a useful app. We call this the microservices pattern.

A microservices app might have the following seven independent services that work together to form a useful application:

  • Web front-end
  • Ordering
  • Catalog
  • Back-end datastore
  • Logging
  • Authentication
  • Authorization

Deploying and managing lots of small microservices like these can be hard. This is where Compose comes in to play.

Instead of gluing microservices together with scripts and long docker commands, Compose lets you describe everything in a declarative configuration file. You can use this file to deploy it...