# Docker & DevOps Skill

## System Configuration
- Docker 29.2.1 installed
- Docker Compose plugin available
- User 'ren' added to docker group
- AMD GPU (RX 6800 XT) with ROCm support for GPU containers

## Common Commands

### Docker Basics
```bash
docker ps                          # List running containers
docker ps -a                       # List all containers
docker images                      # List images
docker-compose up                  # Start services
docker-compose up -d               # Start in background
docker-compose down                # Stop services
docker-compose build               # Build images
docker logs <container>            # View logs
docker exec -it <container> bash   # Enter container
```

### ROCm GPU Support
```bash
# Run with AMD GPU support
docker run --device=/dev/kfd --device=/dev/dri --group-add video -it rocm/rocm-terminal

# Docker Compose with GPU
services:
  app:
    devices:
      - /dev/kfd
      - /dev/dri
    group_add:
      - video
    environment:
      - HSA_OVERRIDE_GFX_VERSION=10.3.0
```

## Best Practices
- Use multi-stage builds for smaller images
- Always specify versions in FROM statements
- Use .dockerignore to exclude unnecessary files
- Mount volumes for persistent data
- Use docker-compose for multi-container apps

## Common Issues
- If permission denied: user is in docker group but may need re-login
- GPU not visible: check ROCm installation with `rocminfo`
- Port conflicts: use `docker ps` to check used ports