Add Kubernetes/K3s deployment manifests and documentation

- Complete k8s manifests with Kustomize support
- Production and staging overlays
- ConfigMap/Secret management
- Ingress with TLS (Traefik/NGINX)
- Persistent storage for SQLite
- Comprehensive k8s README with operations guide
- Updated main README with k8s deployment instructions
- Gitignore for k8s secrets

Usage:
  kubectl apply -k k8s/overlays/production

.gitignore

@@ -44,3 +44,7 @@ vendor/
 # Temporary files
 *.tmp
 *.temp
+
+# Kubernetes secrets (never commit these!)
+k8s/overlays/*/secrets.yaml
+!k8s/overlays/*/secrets.example.yaml

README.md

@@ -77,9 +77,11 @@ TRUSTED_PROXIES=10.0.0.0/8,172.16.0.0/12
 
 ### Deployment
 
+#### Docker Compose (Recommended for single node)
+
 ```bash
 # Clone and start
-git clone <repo>
+git clone https://git.dws.rip/DWS/dyn.git
 cd dyn
 docker-compose up -d
 
@@ -90,6 +92,44 @@ docker-compose logs -f
 docker-compose down
 ```
 
+#### Kubernetes / K3s
+
+For production deployments on Kubernetes or K3s clusters:
+
+```bash
+# Clone repository
+git clone https://git.dws.rip/DWS/dyn.git
+cd dyn
+
+# Create your secrets file
+cp k8s/overlays/production/secrets.example.yaml k8s/overlays/production/secrets.yaml
+# Edit secrets.yaml with your actual Technitium credentials
+
+# Deploy with kustomize
+kubectl apply -k k8s/overlays/production
+
+# Or with kubectl 1.14+ (built-in kustomize)
+kubectl apply -k k8s/overlays/production
+
+# Check deployment status
+kubectl get pods -n dyn-ddns
+kubectl logs -n dyn-ddns -l app=dyn-ddns
+
+# Delete deployment
+kubectl delete -k k8s/overlays/production
+```
+
+**Kustomize Overlays:**
+- `k8s/overlays/production` - Production setup (2 replicas, higher resource limits)
+- `k8s/overlays/staging` - Staging environment (1 replica, relaxed rate limits)
+
+**Requirements:**
+- Cert-manager (for TLS certificates via Let's Encrypt)
+- Traefik or NGINX ingress controller
+- Persistent storage class (for SQLite database)
+
+See [k8s/README.md](k8s/README.md) for detailed Kubernetes deployment documentation.
+
 ## API Endpoints
 
 ### Web UI

k8s/README.md

@@ -0,0 +1,365 @@
+# Kubernetes Deployment
+
+This directory contains Kubernetes manifests for deploying the DWS Dynamic DNS service on K3s, Kubernetes, or any K8s-compatible platform.
+
+## Directory Structure
+
+```
+k8s/
+├── base/                          # Base manifests (don't edit directly)
+│   ├── deployment.yaml            # Deployment, Service, PVC
+│   ├── configmap.yaml             # Non-sensitive configuration
+│   ├── secrets.yaml               # Sensitive configuration (placeholders)
+│   ├── ingress.yaml               # Ingress with TLS
+│   └── kustomization.yaml         # Base kustomization
+│
+├── overlays/
+│   ├── production/                # Production environment
+│   │   ├── kustomization.yaml     # Production-specific settings
+│   │   ├── deployment-patch.yaml  # Resource adjustments
+│   │   ├── namespace.yaml         # Production namespace
+│   │   ├── secrets.yaml           # Production secrets (gitignored)
+│   │   └── secrets.example.yaml   # Example secrets template
+│   │
+│   └── staging/                   # Staging environment
+│       ├── kustomization.yaml     # Staging-specific settings
+│       ├── deployment-patch.yaml  # Single replica, lower resources
+│       ├── namespace.yaml         # Staging namespace
+│       ├── secrets.yaml           # Staging secrets (gitignored)
+│       └── secrets.example.yaml   # Example secrets template
+│
+└── README.md                      # This file
+```
+
+## Quick Start
+
+### Prerequisites
+
+- Kubernetes 1.21+ or K3s cluster
+- kubectl configured with cluster access
+- cert-manager installed (for TLS certificates)
+- Ingress controller (Traefik, NGINX, etc.)
+- Storage class for persistent volumes
+
+### Production Deployment
+
+```bash
+# 1. Clone and enter directory
+git clone https://git.dws.rip/DWS/dyn.git
+cd dyn/k8s
+
+# 2. Create production secrets
+cp overlays/production/secrets.example.yaml overlays/production/secrets.yaml
+
+# 3. Edit secrets with your Technitium credentials
+# Replace 'your-production-api-token-here' with actual token
+nano overlays/production/secrets.yaml
+
+# 4. Deploy to production
+kubectl apply -k overlays/production
+
+# 5. Verify deployment
+kubectl get pods -n dyn-ddns
+kubectl get svc -n dyn-ddns
+kubectl get ingress -n dyn-ddns
+
+# 6. Check logs
+kubectl logs -n dyn-ddns -l app.kubernetes.io/name=dyn-ddns -f
+```
+
+### Staging Deployment
+
+```bash
+# Similar process for staging
+cp overlays/staging/secrets.example.yaml overlays/staging/secrets.yaml
+# Edit with staging credentials
+kubectl apply -k overlays/staging
+```
+
+## Configuration
+
+### Secrets (Required)
+
+Create `overlays/production/secrets.yaml`:
+
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: dyn-ddns-secrets
+type: Opaque
+stringData:
+  # Choose ONE authentication method:
+  
+  # Method 1: API Token (recommended)
+  TECHNITIUM_TOKEN: "your-actual-api-token-here"
+  
+  # Method 2: Username/Password
+  # TECHNITIUM_USERNAME: "admin"
+  # TECHNITIUM_PASSWORD: "your-password"
+  
+  # Optional: Trusted proxies
+  # TRUSTED_PROXIES: "10.0.0.0/8,172.16.0.0/12"
+```
+
+**Important:** Never commit secrets.yaml to git. It's already in .gitignore.
+
+### ConfigMap (Optional Overrides)
+
+Edit `overlays/production/kustomization.yaml`:
+
+```yaml
+configMapGenerator:
+  - name: dyn-ddns-config
+    behavior: merge
+    literals:
+      - TECHNITIUM_URL=https://dns.dws.rip
+      - BASE_DOMAIN=dws.rip
+      - SPACE_SUBDOMAIN=space
+      - RATE_LIMIT_PER_IP=10
+      - RATE_LIMIT_PER_TOKEN=1
+```
+
+### Ingress Customization
+
+By default, the ingress is configured for **Traefik** with cert-manager:
+
+```yaml
+annotations:
+  traefik.ingress.kubernetes.io/router.entrypoints: websecure
+  traefik.ingress.kubernetes.io/router.tls: "true"
+  cert-manager.io/cluster-issuer: "letsencrypt-prod"
+```
+
+For **NGINX** ingress, change annotations in `base/ingress.yaml`:
+
+```yaml
+annotations:
+  kubernetes.io/ingress.class: nginx
+  cert-manager.io/cluster-issuer: "letsencrypt-prod"
+  nginx.ingress.kubernetes.io/ssl-redirect: "true"
+```
+
+## Architecture
+
+### Components
+
+1. **Deployment** - Runs the DDNS bridge container
+   - Replicas: 2 (production), 1 (staging)
+   - Resource limits configurable per overlay
+   - Health checks (liveness & readiness probes)
+
+2. **Service** - ClusterIP exposing port 80
+
+3. **Ingress** - TLS termination at edge
+   - Host: dyn.dws.rip (customize as needed)
+   - Automatic certificate via cert-manager
+
+4. **PersistentVolumeClaim** - SQLite database storage
+   - Size: 1Gi (adjustable)
+   - AccessMode: ReadWriteOnce
+
+### Resource Requirements
+
+**Production:**
+- CPU: 200m request / 1000m limit
+- Memory: 128Mi request / 512Mi limit
+- Replicas: 2
+
+**Staging:**
+- CPU: 100m request / 500m limit
+- Memory: 64Mi request / 256Mi limit
+- Replicas: 1
+
+## Operations
+
+### View Logs
+
+```bash
+# All pods
+kubectl logs -n dyn-ddns -l app.kubernetes.io/name=dyn-ddns
+
+# Specific pod
+kubectl logs -n dyn-ddns -f deployment/prod-dyn-ddns
+
+# Previous container logs (after restart)
+kubectl logs -n dyn-ddns --previous deployment/prod-dyn-ddns
+```
+
+### Scale Deployment
+
+```bash
+# Scale to 3 replicas
+kubectl scale deployment -n dyn-ddns prod-dyn-ddns --replicas=3
+
+# Edit deployment directly
+kubectl edit deployment -n dyn-ddns prod-dyn-ddns
+```
+
+### Database Backup
+
+The SQLite database is stored in the persistent volume at `/data/dyn.db`:
+
+```bash
+# Find the pod
+POD=$(kubectl get pod -n dyn-ddns -l app.kubernetes.io/name=dyn-ddns -o jsonpath='{.items[0].metadata.name}')
+
+# Copy database locally
+kubectl cp dyn-ddns/$POD:/data/dyn.db ./dyn-backup-$(date +%Y%m%d).db
+
+# Or exec into pod
+kubectl exec -it -n dyn-ddns $POD -- sh
+# Then: sqlite3 /data/dyn.db "SELECT * FROM spaces;"
+```
+
+### Update Deployment
+
+```bash
+# Update to latest image
+kubectl rollout restart deployment -n dyn-ddns prod-dyn-ddns
+
+# Or set specific image tag
+kubectl set image deployment -n dyn-ddns prod-dyn-ddns dyn-ddns=git.dws.rip/DWS/dyn:v1.0.0
+
+# Monitor rollout
+kubectl rollout status deployment -n dyn-ddns prod-dyn-ddns
+```
+
+### Troubleshooting
+
+**Pod stuck in Pending:**
+```bash
+kubectl describe pod -n dyn-ddns <pod-name>
+# Check: Storage class available? PV provisioned?
+```
+
+**Pod crash looping:**
+```bash
+kubectl logs -n dyn-ddns --previous <pod-name>
+# Check: Secrets configured? Technitium URL reachable?
+```
+
+**Ingress not working:**
+```bash
+kubectl describe ingress -n dyn-ddns prod-dyn-ddns
+kubectl get certificate -n dyn-ddns
+# Check: DNS pointing to ingress controller? Cert-manager working?
+```
+
+## Advanced Usage
+
+### Multi-Environment Setup
+
+Deploy to multiple environments:
+
+```bash
+# Staging
+kubectl apply -k overlays/staging
+
+# Production
+kubectl apply -k overlays/production
+
+# Verify both
+kubectl get pods --all-namespaces -l app.kubernetes.io/name=dyn-ddns
+```
+
+### Custom Overlay
+
+Create your own overlay for specific needs:
+
+```bash
+mkdir overlays/custom
+cat > overlays/custom/kustomization.yaml << 'EOF'
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../base
+
+namespace: my-namespace
+
+configMapGenerator:
+  - name: dyn-ddns-config
+    behavior: merge
+    literals:
+      - TECHNITIUM_URL=https://my-dns-server.example.com
+      - RATE_LIMIT_PER_IP=5
+EOF
+
+kubectl apply -k overlays/custom
+```
+
+### Monitoring
+
+The deployment exposes standard metrics. Add Prometheus scraping:
+
+```yaml
+# Add to deployment-patch.yaml
+metadata:
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "8080"
+```
+
+## Security Considerations
+
+1. **Secrets Management**
+   - Never commit secrets to git
+   - Consider using external secrets operator (Vault, Sealed Secrets)
+   - Rotate Technitium API tokens regularly
+
+2. **Network Policies**
+   ```yaml
+   # Example network policy
+   apiVersion: networking.k8s.io/v1
+   kind: NetworkPolicy
+   metadata:
+     name: dyn-ddns-netpol
+     namespace: dyn-ddns
+   spec:
+     podSelector:
+       matchLabels:
+         app.kubernetes.io/name: dyn-ddns
+     policyTypes:
+     - Ingress
+     - Egress
+     ingress:
+     - from:
+       - namespaceSelector:
+           matchLabels:
+             name: ingress-nginx
+       ports:
+       - protocol: TCP
+         port: 8080
+     egress:
+     - to: []  # Allow all egress (for Technitium API)
+   ```
+
+3. **Pod Security**
+   - Container runs as non-root (in Dockerfile)
+   - Read-only root filesystem recommended
+   - Drop all capabilities
+
+## Maintenance
+
+### Regular Tasks
+
+1. **Backup database weekly**
+2. **Monitor rate limit metrics**
+3. **Review access logs**
+4. **Update base image for security patches**
+
+### Version Upgrades
+
+1. Update image tag in overlay kustomization
+2. Apply changes: `kubectl apply -k overlays/production`
+3. Verify rollout: `kubectl rollout status ...`
+4. Monitor for errors in logs
+
+## Support
+
+For issues specific to Kubernetes deployment:
+1. Check pod logs: `kubectl logs ...`
+2. Describe resources: `kubectl describe ...`
+3. Check ingress controller logs
+4. Verify cert-manager is issuing certificates

k8s/base/configmap.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: dyn-ddns-config
+data:
+  SERVER_PORT: "8080"
+  DATABASE_PATH: "/data/dyn.db"
+  BASE_DOMAIN: "dws.rip"
+  SPACE_SUBDOMAIN: "space"
+  RATE_LIMIT_PER_IP: "10"
+  RATE_LIMIT_PER_TOKEN: "1"
+  # TECHNITIUM_URL: "https://dns.dws.rip"
+  # Add your Technitium URL above or in overlays

k8s/base/deployment.yaml

@@ -0,0 +1,86 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dyn-ddns
+  labels:
+    app: dyn-ddns
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: dyn-ddns
+  template:
+    metadata:
+      labels:
+        app: dyn-ddns
+    spec:
+      containers:
+      - name: dyn-ddns
+        image: git.dws.rip/DWS/dyn:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+          name: http
+        envFrom:
+        - configMapRef:
+            name: dyn-ddns-config
+        - secretRef:
+            name: dyn-ddns-secrets
+        volumeMounts:
+        - name: data
+          mountPath: /data
+        resources:
+          requests:
+            memory: "64Mi"
+            cpu: "100m"
+          limits:
+            memory: "256Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 10
+          periodSeconds: 30
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 3
+      volumes:
+      - name: data
+        persistentVolumeClaim:
+          claimName: dyn-ddns-data
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: dyn-ddns
+  labels:
+    app: dyn-ddns
+spec:
+  selector:
+    app: dyn-ddns
+  ports:
+  - port: 80
+    targetPort: 8080
+    name: http
+  type: ClusterIP
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: dyn-ddns-data
+  labels:
+    app: dyn-ddns
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

k8s/base/ingress.yaml

@@ -0,0 +1,30 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: dyn-ddns
+  annotations:
+    # Traefik
+    traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    traefik.ingress.kubernetes.io/router.tls: "true"
+    cert-manager.io/cluster-issuer: "letsencrypt-prod"
+    
+    # NGINX (uncomment if using NGINX ingress)
+    # kubernetes.io/ingress.class: nginx
+    # cert-manager.io/cluster-issuer: "letsencrypt-prod"
+    # nginx.ingress.kubernetes.io/ssl-redirect: "true"
+spec:
+  tls:
+  - hosts:
+    - dyn.dws.rip
+    secretName: dyn-ddns-tls
+  rules:
+  - host: dyn.dws.rip
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: dyn-ddns
+            port:
+              number: 80

k8s/base/kustomization.yaml

@@ -0,0 +1,17 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - deployment.yaml
+  - configmap.yaml
+  - ingress.yaml
+
+commonLabels:
+  app.kubernetes.io/name: dyn-ddns
+  app.kubernetes.io/part-of: dws-dns
+
+namespace: default
+
+images:
+  - name: git.dws.rip/DWS/dyn
+    newTag: latest

k8s/base/secrets.yaml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: dyn-ddns-secrets
+type: Opaque
+stringData:
+  # Choose ONE authentication method:
+  
+  # Method 1: API Token (recommended)
+  # TECHNITIUM_TOKEN: "your-api-token-here"
+  
+  # Method 2: Username/Password
+  # TECHNITIUM_USERNAME: "admin"
+  # TECHNITIUM_PASSWORD: "your-password"
+  
+  # Optional: Trusted proxies (comma-separated)
+  # TRUSTED_PROXIES: "10.0.0.0/8,172.16.0.0/12"

k8s/overlays/production/deployment-patch.yaml

@@ -0,0 +1,16 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dyn-ddns
+spec:
+  template:
+    spec:
+      containers:
+      - name: dyn-ddns
+        resources:
+          requests:
+            memory: "128Mi"
+            cpu: "200m"
+          limits:
+            memory: "512Mi"
+            cpu: "1000m"

k8s/overlays/production/kustomization.yaml

@@ -0,0 +1,28 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - ../../base
+  - secrets.yaml
+
+namePrefix: prod-
+namespace: dyn-ddns
+
+commonLabels:
+  environment: production
+
+configMapGenerator:
+  - name: dyn-ddns-config
+    behavior: merge
+    literals:
+      - TECHNITIUM_URL=https://dns.dws.rip
+      - RATE_LIMIT_PER_IP=10
+      - RATE_LIMIT_PER_TOKEN=1
+
+patchesStrategicMerge:
+  - deployment-patch.yaml
+
+replicas:
+  - name: dyn-ddns
+    count: 2

k8s/overlays/production/namespace.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: dyn-ddns
+  labels:
+    app.kubernetes.io/name: dyn-ddns
+    app.kubernetes.io/part-of: dws-dns

k8s/overlays/production/secrets.example.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: dyn-ddns-secrets
+type: Opaque
+stringData:
+  # Replace with your actual Technitium API token
+  TECHNITIUM_TOKEN: "your-production-api-token-here"
+  
+  # Or use username/password (not recommended for production)
+  # TECHNITIUM_USERNAME: "admin"
+  # TECHNITIUM_PASSWORD: "your-password"

k8s/overlays/staging/deployment-patch.yaml

@@ -0,0 +1,17 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: dyn-ddns
+spec:
+  replicas: 1
+  template:
+    spec:
+      containers:
+      - name: dyn-ddns
+        resources:
+          requests:
+            memory: "64Mi"
+            cpu: "100m"
+          limits:
+            memory: "256Mi"
+            cpu: "500m"

k8s/overlays/staging/kustomization.yaml

@@ -0,0 +1,24 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - ../../base
+  - secrets.yaml
+
+namePrefix: staging-
+namespace: dyn-ddns-staging
+
+commonLabels:
+  environment: staging
+
+configMapGenerator:
+  - name: dyn-ddns-config
+    behavior: merge
+    literals:
+      - TECHNITIUM_URL=https://dns-staging.dws.rip
+      - RATE_LIMIT_PER_IP=100
+      - RATE_LIMIT_PER_TOKEN=10
+
+patchesStrategicMerge:
+  - deployment-patch.yaml

k8s/overlays/staging/namespace.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: dyn-ddns-staging
+  labels:
+    app.kubernetes.io/name: dyn-ddns
+    app.kubernetes.io/part-of: dws-dns

k8s/overlays/staging/secrets.example.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: dyn-ddns-secrets
+type: Opaque
+stringData:
+  # Replace with your staging Technitium credentials
+  TECHNITIUM_TOKEN: "your-staging-api-token-here"