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In this course, you’ll learn about containers, creating images, containerizing applications, and effectively deploying Docker in real-world scenarios.

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Containers have revolutionized the IT world, making it difficult to know where to begin. This course will take you from basics to proficiency step by step.
You’ll start by learning the basics of containers and how they work. Then, you’ll explore key concepts like images and the Docker engine. With the basics out of the way, you’ll learn how to containerize and run an application. After completing this course, you’ll be ready to use Docker in the real world.

Docker Guide for Beginners

# Sharing layers to improve performance
Docker images can share layers, leading to efficiencies in space and performance. One of the earlier `docker pull` commands generated an `Already exists` message for one of the layers it pulled. This occurred because one of my Docker Desktop extensions had already pulled an image that used the exact same layer. As a result, Docker skipped that layer as it already had a local copy.

Here’s the code from earlier:



Learn how sharing layers can optimize the image build process. 

About the Course

An Overview of Containers

Docker and Container-Related Standards and Projects

The Big Picture

The Docker Engine

Working with Images

Working with Containers

Containerizing an Application

Conclusion

Appendix: Getting Docker

Sharing Image Layers

Sharing layers to improve performance