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

Docker Engine and containerd – Linux security features

Docker Engine, which you installed previously, acts as the coordinator for all your application containers. In addition to the engine are other key components that make up the Docker ecosystem. Initially, many of the components were baked into Docker Engine, but over the years, in order to make the engine smaller and faster, some components, such as the runtime mechanism for managing containers, were broken down into separate projects.

One example of this is the containerd project. containerd, which implements runc, allows container management and is used in a number of related projects beyond Docker, including Kubernetes CRI.

Note

You can download and view the source code for containerd from GitHub at https://github.com/docker/containerd and runc at https://github.com/opencontainers/runc.

containerd solves the problem of aggregating a number of features in the Linux kernel and providing an abstraction layer...