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

Complexity and limits to scaling deployments through Jenkins

Since Jenkins is a general-purpose tool for building and scripting processes related to software development, it offers immense flexibility, but at the cost of complexity. While it can do almost any function related to continuous integration and deployment, it may take more scripting and setup than other systems, such as Spinnaker, CodeFresh, or WeaveWorks, that are more purpose-built. Some other continuous integration and deployment systems deal exclusively with Docker-focused workflows.

Using Jenkins to manage builds, tests, and deployments to one or two hosts is quite manageable. But when you start to scale out, it may become more complex and difficult to continue to use Jenkins to handle builds and deployments. The build and deployment scripts may also become too complex to manage due to the many different programming languages and approaches required. Let's examine these limits, starting with limits about managing...