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+---
+name: docker-compose
+description: Define and run multi-container Docker applications using Docker Compose. Create compose files, manage service dependencies, configure networks and volumes, and orchestrate local development environments. Use when setting up multi-service applications or development environments.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# Docker Compose
+
+Orchestrate multi-container applications with declarative YAML configuration.
+
+## When to Use This Skill
+
+Use this skill when:
+- Running multi-container applications locally
+- Setting up development environments
+- Defining service dependencies and networking
+- Managing application stacks with multiple services
+- Creating reproducible development setups
+
+## Prerequisites
+
+- Docker Engine with Compose plugin (v2)
+- Basic Docker knowledge
+- YAML syntax understanding
+
+## Basic Configuration
+
+### Simple Application Stack
+
+```yaml
+# docker-compose.yml
+version: '3.8'
+
+services:
+  web:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=development
+      - DATABASE_URL=postgres://postgres:secret@db:5432/myapp
+    depends_on:
+      - db
+      - redis
+
+  db:
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: secret
+      POSTGRES_DB: myapp
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+
+volumes:
+  postgres-data:
+```
+
+## Service Configuration
+
+### Build Options
+
+```yaml
+services:
+  app:
+    build:
+      context: ./app
+      dockerfile: Dockerfile.dev
+      args:
+        NODE_VERSION: "20"
+      target: development
+      cache_from:
+        - myapp:cache
+    image: myapp:dev
+```
+
+### Environment Variables
+
+```yaml
+services:
+  app:
+    environment:
+      - NODE_ENV=production
+      - API_KEY=${API_KEY}  # From shell or .env file
+    env_file:
+      - .env
+      - .env.local
+```
+
+### Port Mapping
+
+```yaml
+services:
+  web:
+    ports:
+      - "3000:3000"           # HOST:CONTAINER
+      - "127.0.0.1:9229:9229" # Bind to localhost only
+      - "8080-8090:8080-8090" # Port range
+    expose:
+      - "3000"                # Internal only (no host binding)
+```
+
+### Volume Mounts
+
+```yaml
+services:
+  app:
+    volumes:
+      # Named volume
+      - app-data:/app/data
+      # Bind mount
+      - ./src:/app/src
+      # Read-only bind mount
+      - ./config:/app/config:ro
+      # Anonymous volume (for node_modules)
+      - /app/node_modules
+
+volumes:
+  app-data:
+    driver: local
+```
+
+### Dependencies
+
+```yaml
+services:
+  web:
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_started
+
+  db:
+    image: postgres:15
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+```
+
+## Networking
+
+### Custom Networks
+
+```yaml
+services:
+  frontend:
+    networks:
+      - frontend-net
+
+  backend:
+    networks:
+      - frontend-net
+      - backend-net
+
+  db:
+    networks:
+      - backend-net
+
+networks:
+  frontend-net:
+    driver: bridge
+  backend-net:
+    driver: bridge
+    internal: true  # No external access
+```
+
+### Network Aliases
+
+```yaml
+services:
+  db:
+    networks:
+      backend:
+        aliases:
+          - database
+          - postgres
+
+networks:
+  backend:
+```
+
+## Resource Limits
+
+```yaml
+services:
+  app:
+    deploy:
+      resources:
+        limits:
+          cpus: '2'
+          memory: 1G
+        reservations:
+          cpus: '0.5'
+          memory: 256M
+```
+
+## Multiple Compose Files
+
+### Override Files
+
+```yaml
+# docker-compose.yml (base)
+services:
+  web:
+    image: myapp:latest
+    ports:
+      - "3000:3000"
+
+# docker-compose.override.yml (development - auto-loaded)
+services:
+  web:
+    build: .
+    volumes:
+      - ./src:/app/src
+    environment:
+      - DEBUG=true
+
+# docker-compose.prod.yml (production)
+services:
+  web:
+    deploy:
+      replicas: 3
+    environment:
+      - DEBUG=false
+```
+
+### Using Multiple Files
+
+```bash
+# Development (uses override automatically)
+docker compose up
+
+# Production
+docker compose -f docker-compose.yml -f docker-compose.prod.yml up
+
+# Merge and view final config
+docker compose -f docker-compose.yml -f docker-compose.prod.yml config
+```
+
+## Profiles
+
+```yaml
+services:
+  web:
+    image: myapp
+
+  db:
+    image: postgres:15
+
+  debug:
+    image: busybox
+    profiles:
+      - debug
+
+  monitoring:
+    image: prometheus
+    profiles:
+      - monitoring
+```
+
+```bash
+# Run without profiles (web, db only)
+docker compose up
+
+# Run with debug profile
+docker compose --profile debug up
+
+# Run with multiple profiles
+docker compose --profile debug --profile monitoring up
+```
+
+## Commands
+
+### Lifecycle
+
+```bash
+# Start services
+docker compose up -d
+
+# Start specific service
+docker compose up -d web
+
+# Stop services
+docker compose stop
+
+# Stop and remove containers
+docker compose down
+
+# Stop and remove everything including volumes
+docker compose down -v --rmi all
+
+# Restart services
+docker compose restart web
+```
+
+### Building
+
+```bash
+# Build images
+docker compose build
+
+# Build without cache
+docker compose build --no-cache
+
+# Build and start
+docker compose up --build
+
+# Pull latest images
+docker compose pull
+```
+
+### Monitoring
+
+```bash
+# View logs
+docker compose logs -f
+
+# View specific service logs
+docker compose logs -f web
+
+# View running services
+docker compose ps
+
+# View resource usage
+docker compose top
+```
+
+### Execution
+
+```bash
+# Run command in new container
+docker compose run --rm web npm test
+
+# Execute in running container
+docker compose exec web /bin/sh
+
+# Scale service
+docker compose up -d --scale worker=3
+```
+
+## Development Workflow
+
+### Watch Mode (Compose v2.22+)
+
+```yaml
+services:
+  web:
+    build: .
+    develop:
+      watch:
+        - action: sync
+          path: ./src
+          target: /app/src
+        - action: rebuild
+          path: ./package.json
+```
+
+```bash
+docker compose watch
+```
+
+### Hot Reload Setup
+
+```yaml
+services:
+  web:
+    build:
+      context: .
+      target: development
+    volumes:
+      - ./src:/app/src
+      - /app/node_modules
+    environment:
+      - CHOKIDAR_USEPOLLING=true
+    command: npm run dev
+```
+
+## Common Patterns
+
+### Database Initialization
+
+```yaml
+services:
+  db:
+    image: postgres:15
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+      - ./init-scripts:/docker-entrypoint-initdb.d:ro
+    environment:
+      POSTGRES_DB: myapp
+```
+
+### Reverse Proxy
+
+```yaml
+services:
+  proxy:
+    image: traefik:v3.0
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ./traefik.yml:/etc/traefik/traefik.yml:ro
+
+  web:
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.web.rule=Host(`app.localhost`)"
+```
+
+## Common Issues
+
+### Issue: Container Cannot Resolve Service Name
+**Problem**: Service can't connect to another service by name
+**Solution**: Ensure services are on the same network, check depends_on
+
+### Issue: Volume Permissions
+**Problem**: Container can't write to mounted volume
+**Solution**: Match container user UID with host, or use named volumes
+
+### Issue: Port Already in Use
+**Problem**: Error binding to port
+**Solution**: Change host port or stop conflicting service
+
+### Issue: Changes Not Reflected
+**Problem**: Code changes don't appear in container
+**Solution**: Check volume mounts, rebuild if Dockerfile changed
+
+## Best Practices
+
+- Use named volumes for persistent data
+- Define healthchecks for database dependencies
+- Use profiles to separate optional services
+- Keep secrets in .env files (not committed)
+- Use override files for environment-specific config
+- Pin image versions for reproducibility
+- Use networks to isolate service groups
+- Leverage watch mode for development
+
+## Related Skills
+
+- [docker-management](../docker-management/) - Docker fundamentals
+- [kubernetes-ops](../../orchestration/kubernetes-ops/) - Production orchestration
+- [reverse-proxy](../../../infrastructure/networking/reverse-proxy/) - Production routing