docker

Docker Skill

Docker and Docker Compose reference for containerized application deployment and management.

Quick Reference

# Container operations
docker ps                         # List running containers
docker ps -a                      # List all containers
docker logs <container>           # View logs
docker logs -f <container>        # Follow logs
docker exec -it <container> sh    # Shell into container
docker inspect <container>        # Full container details

Compose operations

docker compose up -d # Start services (detached) docker compose down # Stop and remove docker compose ps # List compose services docker compose logs -f # Follow all logs docker compose pull # Pull latest images docker compose restart # Restart services

Troubleshooting

docker stats # Resource usage docker network ls # List networks docker network inspect # Network details docker volume ls # List volumes docker system df # Disk usage docker system prune # Clean up unused resources

## Reference Files

Load on-demand based on task:

| Topic | File | When to Load |
|-------|------|--------------|
| Compose Structure | [compose.md](references/compose.md) | Writing docker-compose.yaml |
| Networking | [networking.md](references/networking.md) | Network modes, port mapping |
| Volumes | [volumes.md](references/volumes.md) | Data persistence, mounts |
| Dockerfile | [dockerfile.md](references/dockerfile.md) | Building images |
| Troubleshooting | [troubleshooting.md](references/troubleshooting.md) | Common errors, diagnostics |

### Proxmox Integration

| Topic | File | When to Load |
|-------|------|--------------|
| Docker on Proxmox | [proxmox/hosting.md](references/proxmox/hosting.md) | VM sizing, storage, GPU passthrough |
| LXC vs Docker | [proxmox/lxc-vs-docker.md](references/proxmox/lxc-vs-docker.md) | Choosing container type |

## Compose File Quick Reference

```yaml
name: myapp  # Project name (optional)

services:
  web:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./html:/usr/share/nginx/html:ro
    networks:
      - frontend
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost"]
      interval: 30s
      timeout: 10s
      retries: 3

networks:
  frontend:
    driver: bridge

volumes:
  data:

Validation Checklist

Before deploying containers:

• Services defined with specific image tags (not :latest)
• Port mappings without conflicts
• Volumes for persistent data
• Networks configured appropriately
• Resource limits set (memory, CPU)
• Health checks for critical services
• Restart policy appropriate
• Secrets not in images or compose file
• .env file for environment variables

Network Mode Quick Decision

Mode	Use Case	Isolation
bridge	Default, most services	Container isolated
host	Performance, network tools	No isolation
macvlan	Direct LAN access	Own MAC/IP
ipvlan	Like macvlan, shared MAC	Own IP
none	No networking	Full isolation

Volume Type Quick Decision

Type	Use Case	Portability
Named volume	Database, app data	Best
Bind mount	Config files, dev	Host-dependent
tmpfs	Secrets, cache	Memory only