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

Adding, inspecting, and removing secrets  

We will now begin exploring the various commands associated with secrets.

Feel free to also substitute the commands in this section with their Kubernetes equivalent if you wish to try those instead. You can find the list of kubectl commands at https://kubernetes.io/docs/concepts/configuration/secret/.

Or you can refer back to Chapter 8, Deploying Docker Apps to Kubernetes, where we created, described, retrieved, and edited secrets via kubectl.

In relation to Docker, we will start by creating secrets first.

Creating

The create command is how we add a new secret to the Raft log file. Its basic format is the following:

docker secret create [OPTIONS] SECRET [file|-]

You may notice this is similar to the command in kubectl, which is kubectl create secret.

When creating a secret, we can use the -l flag to add a label to the secret, such as the following:

docker secret create -l key=val api_key -

This allows...