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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

In the previous lesson, we created a container running a web app. But how did the container know which app to start and how to start it?

# Different ways to start an app in a container
There are three ways we can tell Docker how to start an app in a container:

1. An `Entrypoint` instruction in the image
2. A `Cmd` instruction in the image
3. A CLI argument



We'll learn more about these in the next chapter, but the `Entrypoint` and `Cmd` instructions are optional image metadata that store the command Docker uses to start the default app. Whenever we start a container from the image, Docker checks the `Entrypoint` or `Cmd` instruction and executes the stored command.

`Entrypoint` instructions cannot be overridden on the CLI, and anything we pass in via the CLI will be appended to the Entrypoint instruction as an argument.

`Cmd` instructions can be overridden by CLI arguments.

Learn how to start an app in a Docker container using Entrypoint, Cmd instructions, or CLI arguments.

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

Start Apps Using Container

Different ways to start an app in a container