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

Secrets in action – examples

It's now time to try out the commands we just reviewed (create/inspect/ls/rm). Make sure your setup is configured to use swarms. You can also re-use the image from the previous chapter for this section. This can be obtained using the following command:

$ docker pull docker pull dockerfordevelopers/shipitclicker@ sha256:39eda93d15866957feaee28f8fc5adb545276a64147445c64992ef 69804dbf01

Important note

Remember, you can use the docker swarm init command to initialize the swarm. Use the --advertise-addr flag with the IP address of your initial container as well.

Previously, we used the following command to add an SSH private key for use with SCP to a single container:

$ docker build --build-arg ssh_prv_key="$(cat ~/.ssh/id_rsa_test)" .

To add this key to our swarm, we would use the following command:

$ docker secret create -l env=dev ssh_prv_key ~/.ssh/id_rsa_test

Here, we have created a new secret with the same...