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Learn everything you need to know to run containers in the real world from Docker Captain Nigel Poulton.

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Containers have revolutionized the IT world and it can be hard to know where to start. In this course, Docker Captain Nigel Poulton guides you through the basics all the way to proficiency.

You'll learn why we have containers and how they work. You’ll run through the basics like images, the Docker engine, and containers. With the basics out of the way, you'll then containerize an application and learn how to run it. Throughout the course, Nigel will demystify all the jargon and buzzwords. When you're done, you'll be ready to use Docker in the real world.

The Beginner’s Guide to Docker

An image defines multiple tightly coupled containers.

Which of the following best describes the relationship between images and containers?

Which of the following best describes the relationship between images and containers?

Images are ____________ constructs.

In a Docker host with zero images, how many images will be pulled in the Docker host after executing the following commands?

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

In a Docker host with zero images, how many images will be pulled in 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 of the following is true regarding tags?

Which of the following is true regarding tags?

Updating an image and applying the old tag will *always* result in the image having the same digest.

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>?

Multiple images can and do share layers to save space and performance.

Multiple images can and do share layers to save space and performance.

It contains everything required for an app to run.

A YAML configuration defining an app and list of dependencies

Which of the following best describes an image?

Which of the following 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


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?

Test the concepts you have learned in this chapter.

About the Course

Containers From 30,000 Feet

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