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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

```shell
docker run python:3.7.9-alpine3.11 python3 
print("Hello world")
```

```shell
docker run -it python:3.7.9-alpine3.11 python3 
print("Hello world")
```

```shell
docker run python:3.7.9-alpine3.11 python3 "Hello world"
```

```shell
docker run -it python:3.7.9-alpine3.11 python3 "Hello world" 
```

To answer the questions, you can try out the commands in the terminal given below.

Which of the following commands will print the `Hello world` in an interactive Python shell?


To answer the questions, you can try out the commands in the terminal given below.
Which of the following commands will print the <code>Hello world</code> in an interactive Python shell?

Containers only contain application code and a minimal set of OS-related constructs, making them smaller than VMs.

Containers are faster than VMs because they have their own optimized separate operating system.

Containers share the host’s OS, allowing them to start faster than VMs.

Containers require fewer system resources since they don’t need a full operating system like VMs.

Why are containers faster than VMs?

Suppose you attach your terminal to a running container using the `docker container exec` command, and then exit it using the `exit` command. Will the container be stopped? 

Suppose you attach your terminal to a running container using the <code>docker container exec</code> command, and then exit it using the <code>exit</code> command. Will the container be stopped?

Which of the following restart policies are offered by Docker?

Which of the following restart policies are offered by Docker?

Which of the following flags will connect your shell prompt to the terminal of a container?

Which of the following flags will connect your shell prompt to the terminal of a container?

Which key sequence lets you exit a running container without killing the main process and terminating the container?

Which key sequence lets you exit a running container without killing the main process and terminating the container?

Which of the following commands will start a new container mapping port `9000` on the Docker host to port `80` on the container?

Which of the following commands will start a new container mapping port <code>9000</code> on the Docker host to port <code>80</code> on the container?

Test the concepts that 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: Containers