🚀 Docker Cheat sheet for Beginners

🐳 What is Docker?

Docker is a powerful platform for automating the deployment of applications within lightweight, portable containers, making it easier to manage and scale applications.

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🔧 Basic Commands

Command	Description
docker --version	Check the installed Docker version
docker pull <image>	Download an image from Docker Hub
docker images	List all downloaded images
docker rmi <image>	Remove an image
docker run <image>	Create and start a container from an image
docker ps	List all running containers
docker ps -a	List all containers (running + stopped)
docker stop <container>	Stop a running container
docker start <container>	Start a stopped container
docker rm <container>	Remove a stopped container

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📦 Working with Containers

Command	Description
docker exec -it <container> /bin/bash	Access the terminal of a running container
docker logs <container>	View logs from a container
docker commit <container> <new_image>	Create a new image from a container's changes
docker network ls	List all networks
docker volume ls	List all volumes

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🛠️ Dockerfile Basics

• Dockerfile Structure:

# Base image
FROM ubuntu:latest

# Maintainer
LABEL maintainer="[e-mail]"

# Install dependencies
RUN apt-get update && apt-get install -y python3

# Copy files
COPY . /app

# Set working directory
WORKDIR /app

# Command to run
CMD ["python3", "app.py"]

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🌐 Docker Compose

• docker-compose.yml Example:

version: '3'
services:
  web:
    image: nginx:latest
    ports:
      - "80:80"
  db:
    image: mysql:latest
    environment:
      MYSQL_ROOT_PASSWORD: example

🔥 Common Commands

Command	Description
docker-compose up	Start services defined in docker-compose.yml
docker-compose down	Stop and remove containers
docker-compose logs	View logs for services

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📘 Useful Tips

• Container Management:

  • Use the -d flag with docker run to run containers in detached mode for background execution.

• Clean Up:

  • Run docker system prune to remove unused data and free up disk space.

• Help:

  • Use docker <command> --help for detailed command information and options.

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🎨 Styling Tips

• Terminal Color: Use terminal color codes for output to make commands visually appealing:

  echo -e "\033[1;32mYour command here\033[0m"

• Icons: Enhance your notes with emojis for a more engaging experience.

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🔗 Resources

• Official Docker Documentation
• Docker Hub

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