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

Deploying a sample application – ShipIt Clicker v4

Let's imagine that the ShipIt Clicker application introduced in previous chapters has been shipped to production and the team responsible for operations is nervous about the limits of scaling this application since it is only deployed on one server. In order to scale out this Docker application to multiple servers, the team has decided to migrate to Kubernetes and package the software for Kubernetes using the Helm package manager. To proceed, let's install Helm and test it out.

Installing Helm

Helm is to Kubernetes what a package manager is to a modern operating system. It allows developers to specify how their application is packaged and deployed in a Kubernetes cluster. Helm is not only a package manager, but also a templating system for generating Kubernetes configurations and applying those configurations in a controlled way. Helm allows developers to define the entire set of containers and their interrelated...