# Ollama Service Deployment Summary

## What Was Created

I've researched and implemented a comprehensive Ollama service configuration for your NixOS home lab. Here's what's been added:

### 1. Research Documentation
- **`/home/geir/Home-lab/research/ollama.md`** - Comprehensive research on Ollama, including features, requirements, security considerations, and deployment recommendations.

### 2. NixOS Module
- **`/home/geir/Home-lab/modules/services/ollama.nix`** - A complete NixOS module for Ollama with:
  - Secure service isolation
  - Configurable network binding
  - Resource management
  - GPU acceleration support
  - Health monitoring
  - Automatic model downloads
  - Backup functionality

### 3. Service Configuration
- **`/home/geir/Home-lab/machines/grey-area/services/ollama.nix`** - Specific configuration for deploying Ollama on grey-area with:
  - 3 popular models (llama3.3:8b, codellama:7b, mistral:7b)
  - Resource limits to protect other services
  - Security-focused localhost binding
  - Monitoring and health checks enabled

### 4. Management Tools
- **`/home/geir/Home-lab/scripts/ollama-cli.sh`** - CLI tool for common Ollama operations
- **`/home/geir/Home-lab/scripts/monitor-ollama.sh`** - Comprehensive monitoring script

### 5. Documentation
- **`/home/geir/Home-lab/documentation/OLLAMA_DEPLOYMENT.md`** - Complete deployment guide
- **`/home/geir/Home-lab/documentation/OLLAMA_INTEGRATION_EXAMPLES.md`** - Integration examples for development workflow

### 6. Configuration Updates
- Updated `grey-area/configuration.nix` to include the Ollama service
- Enhanced home-lab-tools package with Ollama tool references

## Quick Deployment

To deploy Ollama to your grey-area server:

```bash
# Navigate to your home lab directory
cd /home/geir/Home-lab

# Deploy the updated configuration
sudo nixos-rebuild switch --flake .#grey-area
```

## What Happens During Deployment

1. **Service Creation**: Ollama systemd service will be created and started
2. **User/Group Setup**: Dedicated `ollama` user and group created for security
3. **Model Downloads**: Three AI models will be automatically downloaded:
   - **llama3.3:8b** (~4.7GB) - General purpose model
   - **codellama:7b** (~3.8GB) - Code-focused model  
   - **mistral:7b** (~4.1GB) - Fast inference model
4. **Directory Setup**: `/var/lib/ollama` created for model storage
5. **Security Hardening**: Service runs with restricted permissions
6. **Resource Limits**: Memory limited to 12GB, CPU to 75%

## Post-Deployment Verification

After deployment, verify everything is working:

```bash
# Check service status
systemctl status ollama

# Test API connectivity
curl http://localhost:11434/api/tags

# Use the CLI tool
/home/geir/Home-lab/scripts/ollama-cli.sh status

# Run comprehensive monitoring
/home/geir/Home-lab/scripts/monitor-ollama.sh --test-inference
```

## Storage Requirements

The initial setup will download approximately **12.6GB** of model data:
- llama3.3:8b: ~4.7GB
- codellama:7b: ~3.8GB
- mistral:7b: ~4.1GB

Ensure grey-area has sufficient storage space.

## Usage Examples

Once deployed, you can use Ollama for:

### Interactive Chat
```bash
# Start interactive session with a model
ollama run llama3.3:8b

# Code assistance
ollama run codellama:7b "Review this function for security issues"
```

### API Usage
```bash
# Generate text via API
curl -X POST http://localhost:11434/api/generate \
  -H "Content-Type: application/json" \
  -d '{"model": "llama3.3:8b", "prompt": "Explain NixOS modules", "stream": false}'

# OpenAI-compatible API
curl http://localhost:11434/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model": "mistral:7b", "messages": [{"role": "user", "content": "Hello!"}]}'
```

### CLI Tool
```bash
# Using the provided CLI tool
ollama-cli.sh models          # List installed models
ollama-cli.sh chat mistral:7b # Start chat session
ollama-cli.sh test            # Run functionality tests
ollama-cli.sh pull phi4:14b   # Install additional models
```

## Security Configuration

The deployment uses secure defaults:
- **Network Binding**: localhost only (127.0.0.1:11434)
- **User Isolation**: Dedicated `ollama` user with minimal permissions
- **Systemd Hardening**: Extensive security restrictions applied
- **No External Access**: Firewall closed by default

To enable external access, consider using a reverse proxy (examples provided in documentation).

## Resource Management

The service includes resource limits to prevent impact on other grey-area services:
- **Memory Limit**: 12GB maximum
- **CPU Limit**: 75% maximum
- **Process Isolation**: Separate user and group
- **File System Restrictions**: Limited write access

## Monitoring and Maintenance

The deployment includes:
- **Health Checks**: Automated service health monitoring
- **Backup System**: Configuration and custom model backup
- **Log Management**: Structured logging with rotation
- **Performance Monitoring**: Resource usage tracking

## Next Steps

1. **Deploy**: Run the nixos-rebuild command above
2. **Verify**: Check service status and API connectivity
3. **Test**: Try the CLI tools and API examples
4. **Integrate**: Use the integration examples for your development workflow
5. **Monitor**: Set up regular monitoring using the provided tools

## Troubleshooting

If you encounter issues:

1. **Check Service Status**: `systemctl status ollama`
2. **View Logs**: `journalctl -u ollama -f`
3. **Monitor Downloads**: `journalctl -u ollama-model-download -f`
4. **Run Diagnostics**: `/home/geir/Home-lab/scripts/monitor-ollama.sh`
5. **Check Storage**: `df -h /var/lib/ollama`

## Future Enhancements

Consider these potential improvements:
- **GPU Acceleration**: Enable if you add a compatible GPU to grey-area
- **Web Interface**: Deploy Open WebUI for browser-based interaction
- **External Access**: Configure reverse proxy for remote access
- **Additional Models**: Install specialized models for specific tasks
- **Integration**: Implement the development workflow examples

The Ollama service is now ready to provide local AI capabilities to your home lab infrastructure!