home-network-k3s-impl/apps/pihole.yaml

---
# Namespace (trust zone; default-deny + policies apply)
apiVersion: v1
kind: Namespace
metadata:
  name: pihole
  labels:
    homelab.keithjackson.dev/app-namespace: 'true'
    gateway-access: shared
  annotations:
    homelab.keithjackson.dev/backup-policy: daily-offcluster
---
# Default-deny baseline (R-NET-01): deny all, allow only DNS
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny
  namespace: pihole
  labels:
    homelab.keithjackson.dev/baseline: default-deny
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress
  ingress: []
  egress:
  - to:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: kube-system
    ports:
    - protocol: UDP
      port: 53
    - protocol: TCP
      port: 53
---
# PVC pihole-config (R-STATE)
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pihole-config
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: longhorn
  resources:
    requests:
      storage: 2Gi
---
# Deployment (R-PLAT-02)
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pihole
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: pihole
  template:
    metadata:
      labels:
        app.kubernetes.io/name: pihole
        homelab.keithjackson.dev/egress-class: internet
        homelab.keithjackson.dev/auth-mode: forward-auth
      annotations:
        homelab.keithjackson.dev/auth-mode: forward-auth
        homelab.keithjackson.dev/auth-groups: platform-admins
    spec:
      containers:
      - name: pihole
        image: pihole/pihole
        ports:
        - containerPort: 80
        volumeMounts:
        - name: config
          mountPath: /data/config
      volumes:
      - name: config
        persistentVolumeClaim:
          claimName: pihole-config
---
# Service
apiVersion: v1
kind: Service
metadata:
  name: pihole
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
spec:
  selector:
    app.kubernetes.io/name: pihole
  ports:
  - name: port-80
    port: 80
    targetPort: 80
---
# CiliumNetworkPolicy gateway-ingress allow (R-NET-01/02): pihole-allow-gateway-ingress
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: pihole-allow-gateway-ingress
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
spec:
  endpointSelector:
    matchLabels:
      app.kubernetes.io/name: pihole
  ingress:
  - fromEntities:
    - ingress
    toPorts:
    - ports:
      - port: '80'
        protocol: TCP
---
# CiliumNetworkPolicy internet/world egress (internet class, R-NET-05): pihole-allow-internet-egress
apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: pihole-allow-internet-egress
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
spec:
  endpointSelector:
    matchLabels:
      app.kubernetes.io/name: pihole
  egress:
  - toEntities:
    - world
---
# HTTPRoute pihole-80 (R-TLS/R-DNS)
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: pihole-80
  namespace: pihole
  labels:
    app.kubernetes.io/name: pihole
  annotations:
    homelab.keithjackson.dev/auth-mode: forward-auth
    homelab.keithjackson.dev/auth-groups: platform-admins
spec:
  parentRefs:
  - name: shared
    namespace: gateway
    sectionName: https
  hostnames:
  - pihole.home.keithjackson.dev
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /
    backendRefs:
    - name: pihole
      port: 80
---
# ServiceMonitor (R-OBS-01)
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: pihole
  namespace: pihole
  labels:
    release: kube-prometheus-stack
    app.kubernetes.io/name: pihole
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: pihole
  namespaceSelector:
    matchNames:
    - pihole
  endpoints:
  - port: metrics
    interval: 30s
---
# PrometheusRule SLI alerts (R-OBS-01)
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: pihole-slis
  namespace: pihole
  labels:
    release: kube-prometheus-stack
    app.kubernetes.io/name: pihole
spec:
  groups:
  - name: pihole.slis
    rules:
    - alert: pihole-down
      expr: up{job="pihole"} == 0
      for: 5m
      labels:
        severity: critical
        service: pihole
      annotations:
        summary: pihole is down
        description: 'pihole has been unreachable for 5m (SLI: up).'