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A few minutes. A new skill.

Short, practical lessons to put Docker to work.

01 / Docker
Docker3:23
~/devops-cycle $
```
FROM node:22-alpine
WORKDIR /app
COPY . .
```
▶
Learn How To Create A Dockerfile in 203 Seconds3:23Watch the video
02 / Docker
Docker2:42
~/devops-cycle $
```
docker --help
```
▶
Docker Basics in 162 Seconds2:42Watch the video
03 / Docker
Docker2:42
~/devops-cycle $
```
docker build -t my-app .
```
▶
Learn How To Create A Docker Image In 162 Seconds2:42Watch the video

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Watch & learn

Learn how to create a Dockerfile in 203 seconds

By Lukas Aichbauer & Ivan Popovic

February 29, 20243 min watchEnglish

Description

Learn in 162 seconds why you need Docker, what it is all about, and how the three core components work together.

Learning outcomes

What is a Dockerfile?
How do I create my first Dockerfile?
What Commands do I need?
How do the commands work together?
How does the cache function work?
How do layers work?

Commands You Will Learn

FROM <base-image> – Set the base image for your Dockerfile (e.g. FROM node:18-alpine). You can search for them on Docker Hub

COPY <path-on-host-file-system> <path-in-image-file-system> – Copy files and directories into the final Docker image (e.g. COPY ./package* .).

RUN <command> – Run a command inside your Docker image, but on build time (e.g. RUN npm install)

EXPOSE <port> – Glorified comment telling a developer which ports are used in this Docker image (e.g. EXPOSE 3000)

CMD [<command>, <option>, <...>] – This is the command that will be executed when the container is started (e.g. CMD ["node", "./build/server.js"])