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Gain insights into Docker with Nigel Poulton. Learn about container basics, image creation, and application containerization, and demystify jargon to proficiently deploy Docker in real-world scenarios.

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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

The process of taking an application and configuring it to run as a container is called “containerizing.”

The process of taking an application and configuring it to run as a container is called “containerizing.”

Which of the following are valid names for the instruction file Docker uses to build images? 

Which of the following are valid names for the instruction file Docker uses to build images?

How many additional layers will the following Dockerfile add on top of the `python:3.8` Docker image?


```Dockerfile
FROM python3.8
LABEL maintainer="Educative"
RUN pip3 install numpy keras tensorflow
COPY . /src
EXPOSE 8000
ENTRYPOINT ["python3", "./main.py"]
```

How many additional layers will the following Dockerfile add on top of the <code>python:3.8</code> Docker image?
<pre><code class="language-Dockerfile">FROM python3.8
LABEL maintainer=&quot;Educative&quot;
RUN pip3 install numpy keras tensorflow
COPY . /src
EXPOSE 8000
ENTRYPOINT [&quot;python3&quot;, &quot;./main.py&quot;]
</code></pre>

Docker needs which of the following information to push an image? 

Docker needs which of the following information to push an image?

Is this a valid Dockerfile?

```Dockerfile
FRoM alpine

rUN apk add --update nodejs npm

cOPY . /src

RUN  npm install

ExPOSE 8080

ENTRYPOINT ["node", "./app.js"]

```


Is this a valid Dockerfile?
<pre><code class="language-Dockerfile">FRoM alpine

rUN apk add --update nodejs npm

cOPY . /src

RUN npm install

ExPOSE 8080

ENTRYPOINT [&quot;node&quot;, &quot;./app.js&quot;]

</code></pre>

```Dockerfile
FROM ubuntu:latest
RUN apt-install python3-pip
RUN pip3 install numpy tensorflow keras
```

```Dockerfile
FROM ubuntu:latest
RUN apt-install python3-pip
RUN pip3 install tensorflow
RUN pip3 install keras
RUN pip3 install numpy 
```

```Dockerfile
FROM ubuntu:latest
RUN apt-install python3-pip
RUN pip3 install numpy 
RUN pip3 install keras
RUN pip3 install tensorflow
```

Suppose a Docker host has built an image from the following `Dockerfile`.

```Dockerfile
FROM ubuntu:latest
RUN apt-install python3-pip
RUN pip3 install numpy 
RUN pip3 install keras
```
Which of the following Dockerfiles best leverages the cache of that Docker host?

Suppose a Docker host has built an image from the following <code>Dockerfile</code>.
<pre><code class="language-Dockerfile">FROM ubuntu:latest
RUN apt-install python3-pip
RUN pip3 install numpy 
RUN pip3 install keras
</code></pre>
Which of the following Dockerfiles best leverages the cache of that Docker host?

Containerizing an app creates an image containing which of the following (choose all that apply)?

Containerizing an app creates an image containing which of the following (choose all that apply)?

Which of the following Dockerfile instructions specifies the base image?

Which of the following Dockerfile instructions specifies the base image?

Where does the `docker push` command save images by default?

Where does the <code>docker push</code> command save images by default?

Which of the following Dockerfile instructions create new image layers (select all that apply)?

Which of the following Dockerfile instructions create new image layers (select all that apply)?

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: Containerizing an Application