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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

# Images and containers

We can start multiple containers from a single image. The image is read-only in this relationship, but each container is read-write. As shown in the figure below, Docker accomplishes this by creating a thin read-write layer for each container and placing it on top of the shared image.



In the figure above, each container has its own thin R/W layer but shares the same image. The containers can see and access the files and apps in the image through their own R/W layer, and if they make any changes, these get written to their R/W layer. When you stop a container, Docker keeps the R/W layer and restores it when you restart the container. However, when you delete a container, Docker deletes its R/W layer. This way, each container can make and keep its own changes without changing the shared image.

# How to check if Docker is running

Run a `docker version` to check whether Docker is running. This command is useful because it checks the CLI and engine components.


Learn how to make sure Docker is running before you proceed with containers. 

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

Check the Running Docker

Images and containers