How do I understand images and containers basics?

## Key Commands - List images: `docker images` - Pull image: `docker pull nginx` - Run container: `docker run -d -p 8080:80 --name my-nginx nginx` - List running: `docker ps` - Logs: `docker logs my-nginx` - Stop: `docker stop my-nginx` - Remove: `docker rm my-nginx` Access http://localhost:8080 to see Nginx welcome page. This introduces images (blueprints) vs containers (running instances).

How do I build your first custom image?

## Clone Sample App ```bash git clone https://github.com/docker/getting-started-app.git cd getting-started-app ``` ## Create Dockerfile ```dockerfile FROM node:24-alpine WORKDIR /app COPY . . RUN npm install CMD [ "node", "src/index.js" ] EXPOSE 3000 ``` ## Build and Run ```bash docker build -t todo-app . docker run -dp 3000:3000 todo-app ``` Visit http://localhost:3000. Edit app code, rebuild to see changes. 67

How do I persist data with volumes?

## Run with Volume ```bash docker run -dp 3000:3000 -v todo-db:/etc/todos todo-app ``` Add todos in app; they persist after `docker stop`/`docker start`. Volumes store data outside container. ## Inspect `docker volume ls`, `docker volume inspect todo-db`. Practice mounting host dir: `-v $(pwd)/data:/data`.

How do I orchestrate with docker compose?

## Install Compose (if not) Included in Docker Desktop/ recent Engine. ## Example docker-compose.yml ```yaml version: '3.8' services: app: image: todo-app ports: - '3000:3000' volumes: - todo-db:/etc/todos volumes: todo-db: ``` ## Run ```bash docker compose up -d ``` Scale: `docker compose up -d --scale app=3`. Down: `docker compose down`. 71

Master Docker Containerization in 5 Steps

Q: How do I install docker and run hello world?

# Install Docker ## For Windows/Mac (Recommended for Beginners) - **Windows**: Ensure WSL 2 is enabled (run `wsl --install` in PowerShell). Download `Docker Desktop Installer.exe` from [docker.com](https://www.docker.com/products/docker-desktop), run it, restart, and launch Docker Desktop. 74 - **macOS**: Download `Docker.dmg` from [docker.com](https://www.docker.com/products/docker-desktop), drag to Applications, launch. 73 ## For Ubuntu/Linux (Engine) ```bash sudo apt-get update sudo apt-get install ca-certificates curl gnupg sudo install -m 0755 -d /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt-get update sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin ``` # Verify Installation Open terminal/PowerShell: ```bash docker run hello-world ``` This pulls and runs a test image, confirming Docker works. 72

🧰

Instant Toolkit

2 artifacts

📋
Step-by-Step Guide

1

Install Docker

For Windows/Mac (Recommended for Beginners)

Windows: Ensure WSL 2 is enabled (run wsl --install in PowerShell). Download Docker Desktop Installer.exe from docker.com, run it, restart, and launch Docker Desktop.
macOS: Download Docker.dmg from docker.com, drag to Applications, launch.

For Ubuntu/Linux (Engine)

sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Verify Installation

Open terminal/PowerShell:

docker run hello-world

This pulls and runs a test image, confirming Docker works.

Why this step matters:

-Establishes a working Docker environment essential for all hands-on practice
-Enables consistent app development across machines without 'it works on my machine' issues

30-60 minutes

Docker Desktop/Engine, Terminal/PowerShell, Web browser

$0

Definition of Done

•Docker installed and Docker Desktop running (whale icon)
•Successfully ran `docker run hello-world` and saw confirmation message

Common Mistakes to Avoid

❌ Forgetting to enable WSL2 on Windows

→Run `wsl --install` as admin and restart

❌ Permission denied on Linux

→Add user to docker group: `sudo usermod -aG docker $USER` then log out/in

2

Following along, or just reading? 👀

Spin up a personalized “learn Docker” plan you can save, check off, and return to anytime — unlimited on the free trial.

Start free trial →

3

4

5

🎥
Suggested Videos

Docker Tutorial for Beginners

Docker Crash Course for Absolute Beginners

📚
Learning Resources

📖 Online Courses

Docker Tutorial Playlist

beginner

TechWorld with Nana (YouTube)

Introduction to Docker

beginner

DataCamp

📖 Recommended Books

Docker Deep Dive

beginner

by Nigel Poulton

The Docker Handbook

beginner

by Farhan Hasin Chowdhury

🌐 Helpful Websites

Docker Official Documentation

documentation

Complete guides, references, and tutorials

Play with Docker

interactive

Browser-based Docker playground, no install needed

Docker Hub

registry

Search and share container images

🛠️ Useful Tools

Docker Desktop

Development

Easy Docker for Mac/Windows/Linux desktops

Docker CLI

CLI

Command-line interface for Docker

Master Docker Containerization in 5 Steps