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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

An image defines multiple tightly coupled containers.

Which option best describes the relationship between images and containers?

Which option best describes the relationship between images and containers?

**(Fill in the blank.)** Images are ________ constructs.

(Fill in the blank.) Images are ________ constructs.

On a Docker host with no images, how many images will be pulled into the Docker host after executing the following commands?

```shell
docker pull alpine 
docker pull alpine:latest
```

On a Docker host with no images, how many images will be pulled into the Docker host after executing the following commands?
<pre><code class="language-shell">docker pull alpine 
docker pull alpine:latest
</code></pre>

Where does Docker push and pull images from by default?

Where does Docker push and pull images from by default?

You cannot pull images without specifying a tag. 

You can tag two different images with the same tag.

Tags automatically expire after a set period.

Which option is true regarding tags?

**(True or False)** Updating an image and applying the old tag will always result in the image having the same digest.

(True or False) Updating an image and applying the old tag will always result in the image having the same digest.

Suppose a Docker host has three images: `image_1`, `image_2`, and `image_3`.
* `image_1` is composed of the following layers: `A`, `B`, and `C`.
*  `image_2` is composed of the following layers: `C`, `D`, and `E`.
*  `image_3` is composed of the following layers: `A` and `D`.

How many layers will be left after you delete `image_3`?   

Suppose a Docker host has three images: <code>image_1</code>, <code>image_2</code>, and <code>image_3</code>.
<ul>
<li><code>image_1</code> is composed of the following layers: <code>A</code>, <code>B</code>, and <code>C</code>.</li>
<li><code>image_2</code> is composed of the following layers: <code>C</code>, <code>D</code>, and <code>E</code>.</li>
<li><code>image_3</code> is composed of the following layers: <code>A</code> and <code>D</code>.</li>
</ul>
How many layers will be left after you delete <code>image_3</code>?

**(True or False)** Multiple images can and do share layers to save space and performance.

(True or False) Multiple images can and do share layers to save space and performance.

It contains everything required for an app to run.

It is a visual representation of a container.

It is a YAML configuration defining an app and a list of dependencies

Which option best describes an image?

How can Docker images be deleted?

Docker will delete the image and the container.

Docker will delete the image but leave the container.


Docker will prevent the delete operation.

What happens if you attempt to delete an image that is being used by a container?

What happens if you attempt to delete an image that is being used by a container?

By using the `-f` flag with the `docker pull` command

By using the `-f` flag with the `docker run` command

By using the `-f` flag with the `docker build` command


By using the `-f` flag with the `docker rmi` command

How can you force the deletion of an image in Docker?

How can you force the deletion of an image in Docker?

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

Quiz: Working with Docker Images