🚀 Docker Cheat sheet for Beginners

muneeb aslam — Thu, 19 Sep 2024 10:26:50 +0000

🐳 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.

🔧 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

📦 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

🛠️ Dockerfile Basics

Dockerfile Structure:

# Base image
FROM ubuntu:latest

# Maintainer
LABEL maintainer="your_name@example.com"

# 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"]

🌐 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

📘 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.

🎨 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.

DEV Community: muneeb aslam