Docker for Beginners

Docker has revolutionized how we build, ship, and run applications. Learn the fundamentals of containerization and how to get started with Docker.

Basic Docker Concepts

Understanding the core components of Docker:

# Example Dockerfile
FROM node:16-alpine

WORKDIR /app

COPY package*.json ./
RUN npm install

COPY . .

EXPOSE 3000
CMD ["npm", "start"]

Docker Commands

Essential commands for working with Docker:

# Build an image
docker build -t myapp:latest .

# Run a container
docker run -d -p 3000:3000 myapp:latest

# List running containers
docker ps

# Stop a container
docker stop container_id

Docker Compose

Managing multi-container applications:

# docker-compose.yml
version: "3.8"
services:
  web:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
    depends_on:
      - db

  db:
    image: postgres:13
    volumes:
      - postgres_data:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=myapp
      - POSTGRES_USER=user
      - POSTGRES_PASSWORD=password

volumes:
  postgres_data: