Bits of .NET

🐳 One Command, All Containers

Managing containers individually is painful. Docker Compose defines and runs multi-container apps. One YAML file, one command.

📝 Docker Compose File

version: '3.8'
services:
  web:
    build: .
    ports:
      - "8080:8080"
    environment:
      - DB_HOST=postgres
      - REDIS_HOST=redis
    depends_on:
      - postgres
      - redis

  postgres:
    image: postgres:15
    environment:
      POSTGRES_PASSWORD: secret
    volumes:
      - postgres_data:/var/lib/postgresql/data

  redis:
    image: redis:alpine

volumes:
  postgres_data:

🎯 Commands

# Start all services
docker-compose up -d

# Build and start
docker-compose up --build

# Stop all services
docker-compose down

# Stop and remove volumes
docker-compose down -v

# View logs
docker-compose logs

# Follow logs
docker-compose logs -f

# Execute in service
docker-compose exec web bash

# Scale service
docker-compose up -d --scale web=3

# List services
docker-compose ps

💡 Benefits

• Single command for multi-container apps
• Service discovery (use service names as hostnames)
• Persistent volumes
• Environment variables
• Networking between services