Book Image

The Docker Workshop

By : Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda
Book Image

The Docker Workshop

By: Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda

Overview of this book

No doubt Docker Containers are the future of highly-scalable software systems and have cost and runtime efficient supporting infrastructure. But learning it might look complex as it comes with many technicalities. This is where The Docker Workshop will help you. Through this workshop, you’ll quickly learn how to work with containers and Docker with the help of practical activities.? The workshop starts with Docker containers, enabling you to understand how it works. You’ll run third party Docker images and also create your own images using Dockerfiles and multi-stage Dockerfiles. Next, you’ll create environments for Docker images, and expedite your deployment and testing process with Continuous Integration. Moving ahead, you’ll tap into interesting topics and learn how to implement production-ready environments using Docker Swarm. You’ll also apply best practices to secure Docker images and to ensure that production environments are running at maximum capacity. Towards the end, you’ll gather skills to successfully move Docker from development to testing, and then into production. While doing so, you’ll learn how to troubleshoot issues, clear up resource bottlenecks and optimize the performance of services. By the end of this workshop, you’ll be able to utilize Docker containers in real-world use cases.
Table of Contents (17 chapters)

Volumes versus Filesystem and Images

Note that volumes are not part of images, so the data saved on volumes won't be uploaded or downloaded with images. The volumes will be engraved in the image, but not its data. Therefore, if you want to save certain data in an image, save it as a file, not as a volume.

The next exercise will demonstrate and clarify the different outputs between saving data on volumes and when saving it on files.

Exercise 7.10: Saving a File on a Volume and Committing It to a New Image

In this exercise, you will run a container with a volume, save some data on the volume, commit the container to a new image, and craft a new container based on this new image. When you check the data from inside the container, you will not find it. The data will be lost. This exercise will demonstrate how the data will be lost when committing the container to a new image. Remember that the data on the volumes will not be engraved in the new image:

  1. Create a new...