Book Image

Docker for Developers

By : Richard Bullington-McGuire, Andrew K. Dennis, Michael Schwartz
2 (1)
Book Image

Docker for Developers

2 (1)
By: Richard Bullington-McGuire, Andrew K. Dennis, Michael Schwartz

Overview of this book

Docker is the de facto standard for containerizing apps, and with an increasing number of software projects migrating to containers, it is crucial for engineers and DevOps teams to understand how to build, deploy, and secure Docker environments effectively. Docker for Developers will help you understand Docker containers from scratch while taking you through best practices and showing you how to address security concerns. Starting with an introduction to Docker, you’ll learn how to use containers and VirtualBox for development. You’ll explore how containers work and develop projects within them after you’ve explored different ways to deploy and run containers. The book will also show you how to use Docker containers in production in both single-host set-ups and in clusters and deploy them using Jenkins, Kubernetes, and Spinnaker. As you advance, you’ll get to grips with monitoring, securing, and scaling Docker using tools such as Prometheus and Grafana. Later, you’ll be able to deploy Docker containers to a variety of environments, including the cloud-native Amazon Elastic Kubernetes Service (Amazon EKS), before finally delving into Docker security concepts and best practices. By the end of the Docker book, you’ll be able to not only work in a container-driven environment confidently but also use Docker for both new and existing projects.
Table of Contents (21 chapters)
1
Section 1: An Introduction to Docker – Containers and Local Development
6
Section 2: Running Docker in Production
14
Section 3: Docker Security – Securing Your Containers

Introduction to Docker Compose

A composing system for containers is a tool that allows us to describe the whole microservices architecture program in a configuration file and then perform operations on the system described. Docker Compose is one such tool. Before we get into what Docker Compose is and does, let's look at the reason why we need a tool like this.

The problem with .sh scripts

So far, we've been using .sh scripts to make working with our microservices application easy. We have used the following scripts:

  • start-mongodb.sh
  • start-redis.sh
  • start-mosca.sh
  • subscriber/start-subscriber.sh
  • publisher/start-publisher.sh
  • subscriber/build.sh
  • publisher/build.sh
  • subscriber/push.sh
  • publisher/push.sh

Instead of having to invoke each of these as separate commands, we can make a single start-all.sh script that invokes them all:

#!/bin/sh
./start-mosca.sh
./start-mongodb.sh
./start-redis.sh
cd subscriber && ./start...