# Traefik Stack - Reverse Proxy with SSL

## Overview

Traefik acts as the central reverse proxy for all services, handling:
- Automatic SSL certificate generation via Let's Encrypt
- HTTP to HTTPS redirection
- Service discovery via Docker labels
- Security headers and compression
- Rate limiting and access control

## Services

- **traefik.michaelschiemer.de** - Traefik Dashboard (BasicAuth protected)

## Prerequisites

1. **Docker Network**
   ```bash
   docker network create traefik-public
   ```

2. **ACME Storage File**
   ```bash
   touch acme.json
   chmod 600 acme.json
   ```

3. **DNS Configuration**
   Point these domains to your server IP (94.16.110.151):
   - `michaelschiemer.de`
   - `*.michaelschiemer.de` (wildcard)

## Configuration

### 1. Create Environment File

```bash
cp .env.example .env
```

### 2. Generate Dashboard Password

```bash
# Generate password hash
htpasswd -nb admin your_secure_password

# Example output:
# admin:$apr1$8kj9d7lj$r.x5jhLVPLuCDLvJ6x0Hd0

# Important: In docker-compose.yml, replace $ with $$
# admin:$$apr1$$8kj9d7lj$$r.x5jhLVPLuCDLvJ6x0Hd0
```

Update the `traefik.http.middlewares.traefik-auth.basicauth.users` label in `docker-compose.yml`.

### 3. Adjust Configuration (Optional)

Edit `traefik.yml` for:
- Log levels
- Certificate resolvers
- Additional entry points
- Metrics configuration

## Deployment

### Initial Setup

```bash
# Create network
docker network create traefik-public

# Create acme.json
touch acme.json
chmod 600 acme.json

# Create log directories
mkdir -p logs

# Start Traefik
docker compose up -d
```

### Verify Deployment

```bash
# Check container status
docker compose ps

# Check logs
docker compose logs -f

# Test dashboard access
curl -I https://traefik.michaelschiemer.de

# Check certificate
openssl s_client -connect traefik.michaelschiemer.de:443 -servername traefik.michaelschiemer.de < /dev/null
```

## Middleware Configuration

Traefik provides several reusable middlewares in `dynamic/middlewares.yml`:

### Security Headers
```yaml
labels:
  - "traefik.http.routers.myapp.middlewares=security-headers-global@file"
```

### Rate Limiting
```yaml
labels:
  # Strict: 50 req/s
  - "traefik.http.routers.myapp.middlewares=rate-limit-strict@file"

  # Moderate: 100 req/s
  - "traefik.http.routers.myapp.middlewares=rate-limit-moderate@file"

  # Lenient: 200 req/s
  - "traefik.http.routers.myapp.middlewares=rate-limit-lenient@file"
```

### Compression
```yaml
labels:
  - "traefik.http.routers.myapp.middlewares=gzip-compression@file"
```

### Middleware Chains
```yaml
labels:
  # Default chain: Security + Compression
  - "traefik.http.routers.myapp.middlewares=default-chain@file"

  # Admin chain: Security + Compression + Rate Limiting
  - "traefik.http.routers.myapp.middlewares=admin-chain@file"
```

## Service Integration

### Example Service Configuration

Add these labels to any Docker service to expose it through Traefik:

```yaml
services:
  myapp:
    image: myapp:latest
    networks:
      - traefik-public
    labels:
      # Enable Traefik
      - "traefik.enable=true"

      # Router configuration
      - "traefik.http.routers.myapp.rule=Host(`app.michaelschiemer.de`)"
      - "traefik.http.routers.myapp.entrypoints=websecure"
      - "traefik.http.routers.myapp.tls=true"
      - "traefik.http.routers.myapp.tls.certresolver=letsencrypt"

      # Service configuration
      - "traefik.http.services.myapp.loadbalancer.server.port=80"

      # Middleware (optional)
      - "traefik.http.routers.myapp.middlewares=default-chain@file"

networks:
  traefik-public:
    external: true
```

## Monitoring

### Dashboard Access

Access the Traefik dashboard at: https://traefik.michaelschiemer.de

Default credentials (change in production):
- Username: `admin`
- Password: (set via htpasswd)

### Logs

```bash
# Access logs (HTTP requests)
tail -f logs/access.log

# Traefik logs (errors, warnings)
tail -f logs/traefik.log

# Container logs
docker compose logs -f traefik
```

### Prometheus Metrics

Traefik exposes Prometheus metrics for monitoring:

```yaml
# Add to Prometheus scrape config
- job_name: 'traefik'
  static_configs:
    - targets: ['traefik:8082']
```

## Troubleshooting

### Certificate Issues

```bash
# Check acme.json permissions
ls -la acme.json
# Should be: -rw------- (600)

# View certificate status
docker compose logs traefik | grep -i "certificate"

# Force certificate renewal
rm acme.json
touch acme.json
chmod 600 acme.json
docker compose restart
```

### DNS Issues

```bash
# Verify DNS resolution
dig michaelschiemer.de
dig git.michaelschiemer.de

# Check from external
nslookup michaelschiemer.de 8.8.8.8
```

### Service Not Accessible

```bash
# Check Traefik can reach service
docker network inspect traefik-public

# Verify service labels
docker inspect <container_name> | grep -A 20 Labels

# Check Traefik logs for routing errors
docker compose logs traefik | grep -i error
```

### Port Conflicts

```bash
# Check if ports 80/443 are free
sudo netstat -tlnp | grep -E ':80|:443'

# Stop conflicting services
sudo systemctl stop nginx  # or apache2
```

## Security Hardening

### 1. IP Whitelisting

Uncomment and configure in `dynamic/middlewares.yml`:

```yaml
admin-whitelist:
  ipWhiteList:
    sourceRange:
      - "your.vpn.ip.range/32"
      - "10.0.0.0/8"
```

### 2. Strong Dashboard Password

```bash
# Generate strong password
openssl rand -base64 32

# Create hash
htpasswd -nb admin "your_strong_password"
```

### 3. Rate Limiting

Apply rate limiting to sensitive endpoints:

```yaml
labels:
  - "traefik.http.routers.admin.middlewares=rate-limit-strict@file"
```

### 4. DDoS Protection

```yaml
# In traefik.yml - add entry point middleware
entryPoints:
  websecure:
    address: ":443"
    http:
      middlewares:
        - rate-limit-moderate@file
```

## Backup

### Important Files

- `acme.json` - SSL certificates
- `traefik.yml` - Static configuration
- `dynamic/` - Dynamic configuration

```bash
# Backup certificates
cp acme.json acme.json.backup.$(date +%Y%m%d)

# Backup configuration
tar -czf traefik-config-backup.tar.gz traefik.yml dynamic/
```

## Updates

```bash
# Pull latest image
docker compose pull

# Restart with new image
docker compose up -d

# Verify
docker compose ps
docker compose logs -f
```

## Performance Tuning

### Connection Limits

In `traefik.yml`:

```yaml
entryPoints:
  websecure:
    transport:
      respondingTimeouts:
        readTimeout: 60s
        writeTimeout: 60s
      lifeCycle:
        requestAcceptGraceTimeout: 0s
        graceTimeOut: 10s
```

### Resource Limits

In `docker-compose.yml`:

```yaml
deploy:
  resources:
    limits:
      memory: 512M
      cpus: '0.5'
    reservations:
      memory: 256M
      cpus: '0.25'
```

## Support

For issues with Traefik configuration:
1. Check official Traefik documentation: https://doc.traefik.io/traefik/
2. Review logs: `docker compose logs -f`
3. Verify network connectivity: `docker network inspect traefik-public`