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

Container security models

Moving up from the hardware layer and how the hypervisor and base operating system mediate access to it, we can begin to review what happens at the software layer running at ring level 3. To explore this, there are two key features of Docker's container security model that we need to understand:

  • Applications are isolated from the underlying host system.
  • Containerized applications are isolated from each other.

So, how does Docker achieve these objectives? The answer to this is, as you may have guessed, via Docker Engine and related components, such as containerd. These components have inherited a number of key Linux features and concepts with major benefits for security, including the following:

  • runc: A lightweight container runtime
  • Namespaces: A Linux method for partitioning kernel resources
  • Control groups (cgroups): A kernel feature for limiting resources such as CPU usage

Additionally, it also allows the implementation...