feat(k8s/pihole): add Pi-hole stack (deployment scaled to 0 for data migration)

kubernetes/app/pihole/configmap-dnscrypt.yaml

@@ -0,0 +1,39 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: dnscrypt-config
+  namespace: pihole
+data:
+  dnscrypt-proxy.toml: |
+    listen_addresses = ['127.0.0.1:5353']
+    max_clients = 250
+    ipv4_servers = true
+    ipv6_servers = false
+    block_ipv6 = true
+    dnscrypt_servers = true
+    doh_servers = true
+    require_dnssec = false
+    force_tcp = false
+    timeout = 5000
+    keepalive = 30
+    lb_strategy = 'p2'
+    cache = true
+    cache_size = 4096
+    cache_min_ttl = 2400
+    cache_max_ttl = 86400
+    http3 = true
+    http3_probe = true
+
+    fallback_resolvers = ['8.8.8.8:53', '1.1.1.1:53']
+    ignore_system_dns = true
+
+    server_names = []
+
+    [static]
+      # Cloudflare DoH
+      [static.'cloudflare']
+      stamp = 'sdns://AgcAAAAAAAAABzEuMC4wLjEAEmRucy5jbG91ZGZsYXJlLmNvbQovZG5zLXF1ZXJ5'
+
+      # Google DoH
+      [static.'google']
+      stamp = 'sdns://AgUAAAAAAAAABzguOC44LjggsKKKE4EwvtIbNjGjagI2607EdKSVHowYZtyvD9iPrkkHOC44LjguOAovZG5zLXF1ZXJ5'

kubernetes/app/pihole/deployment.yaml

@@ -0,0 +1,72 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pihole
+  namespace: pihole
+  labels:
+    app: pihole
+spec:
+  replicas: 0
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: pihole
+  template:
+    metadata:
+      labels:
+        app: pihole
+    spec:
+      containers:
+        - name: pihole
+          image: pihole/pihole:2025.08.0
+          env:
+            - name: TZ
+              value: Europe/Kyiv
+            - name: FTLCONF_webserver_api_password
+              valueFrom:
+                secretKeyRef:
+                  name: pihole-credentials
+                  key: WEBPASSWORD
+            - name: FTLCONF_dns_listeningMode
+              value: all
+            - name: FTLCONF_dns_upstreams
+              value: "127.0.0.1#5353"
+            - name: FTLCONF_misc_etc_dnsmasq_d
+              value: "true"
+          ports:
+            - containerPort: 53
+              protocol: TCP
+              name: dns-tcp
+            - containerPort: 53
+              protocol: UDP
+              name: dns-udp
+            - containerPort: 80
+              protocol: TCP
+              name: http
+          volumeMounts:
+            - name: pihole-config
+              mountPath: /etc/pihole
+            - name: pihole-dnsmasq
+              mountPath: /etc/dnsmasq.d
+
+        - name: dnscrypt-proxy
+          image: klutchell/dnscrypt-proxy:latest
+          env:
+            - name: TZ
+              value: Europe/Kyiv
+          volumeMounts:
+            - name: dnscrypt-config
+              mountPath: /config/dnscrypt-proxy.toml
+              subPath: dnscrypt-proxy.toml
+
+      volumes:
+        - name: pihole-config
+          persistentVolumeClaim:
+            claimName: pihole-config
+        - name: pihole-dnsmasq
+          persistentVolumeClaim:
+            claimName: pihole-dnsmasq
+        - name: dnscrypt-config
+          configMap:
+            name: dnscrypt-config

kubernetes/app/pihole/ingress.yaml

@@ -0,0 +1,24 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: pihole
+  namespace: pihole
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt
+    traefik.ingress.kubernetes.io/router.middlewares: authelia-chain-authelia-authelia-auth@kubernetescrd
+spec:
+  tls:
+    - hosts:
+        - ${PIHOLE_HOST}
+      secretName: pihole-tls
+  rules:
+    - host: ${PIHOLE_HOST}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: pihole
+                port:
+                  number: 80

kubernetes/app/pihole/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: pihole

kubernetes/app/pihole/networkpolicy.yaml

@@ -0,0 +1,31 @@
+# Note: NetworkPolicy applies to pod-level traffic via the cluster network.
+# DNS traffic on port 53 arrives via hostNetwork and bypasses these policies.
+# These policies govern cluster-internal traffic (e.g. Traefik → pihole web UI).
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default-deny-ingress
+  namespace: pihole
+spec:
+  podSelector: {}
+  policyTypes:
+    - Ingress
+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-ingress-controller
+  namespace: pihole
+spec:
+  podSelector:
+    matchLabels:
+      app: pihole
+  policyTypes:
+    - Ingress
+  ingress:
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: traefik
+      ports:
+        - port: 80

kubernetes/app/pihole/pvc.yaml

@@ -0,0 +1,25 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pihole-config
+  namespace: pihole
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: nfs-synology-ssd
+  resources:
+    requests:
+      storage: 2Gi
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pihole-dnsmasq
+  namespace: pihole
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: nfs-synology-ssd
+  resources:
+    requests:
+      storage: 1Gi

kubernetes/app/pihole/secret.sops.yaml

@@ -0,0 +1,22 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: pihole-credentials
+    namespace: pihole
+stringData:
+    WEBPASSWORD: ENC[AES256_GCM,data:Sl3wOaQ=,iv:Dfxr5s97cMJHK0R+Ve6AzMFcLpl7ilV9Pq8RLSvQQHE=,tag:5u+8u1DBrU0Gazm/4JxIBQ==,type:str]
+sops:
+    age:
+        - recipient: age1zffnskvuezntkk703a0pyxsd5m8vx2hm33dr47wdfy8mn4fdw4sqgw0jgc
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBRTE1tbzhLdkJpeXFOSHF3
+            Nlk1Tm83UVdoZytuQ01yLzhJUlJPdVdEWkhzClJ6MkxvSVZmMkEwNWJYM0R3MGxP
+            NHhsVElPTlJZeEZIakZGSWpXYWcvV2MKLS0tIGZPbkxvTDBnNVVKUk5YZXZOQVJ1
+            dVRld2ZKdmdUNDgwZmpjeElvSXdydE0KZItCnGh6eHKJYtC5n5JLwLCfOWblh0iN
+            4Q1O8uUXyz9EzTgY7CSAGpHo7N9pLznFr3AnOE4b2T5enDDnSK/tSg==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-03-01T10:40:42Z"
+    mac: ENC[AES256_GCM,data:fEe5fEqgRtru1dZ/rVeDWIiT0sY4Or5z4AR8gzBDuBoF/lJQz86v32CoqhboMHl3EPdvZtteg2WBDU4LuwOHmhLf4qpvPX2KxL9rbe9ND3wP2PoEK/cMO7lqIKCVDOOz3OtdEcR7iT1XLr7wze1x4W9MjqLMqvcGplkRls77hlU=,iv:2JTEavm5ftNOU51dNG73RxpqahBNAsXlm+QHnlWt3Cc=,tag:YBmATtmbnsWGY3348Kz3/w==,type:str]
+    encrypted_regex: ^(data|stringData|email)$
+    version: 3.12.1

kubernetes/app/pihole/service-dns.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: pihole-dns
+  namespace: pihole
+  annotations:
+    metallb.io/loadBalancerIPs: 10.127.1.200
+spec:
+  type: LoadBalancer
+  selector:
+    app: pihole
+  ports:
+    - port: 53
+      targetPort: 53
+      protocol: TCP
+      name: dns-tcp
+    - port: 53
+      targetPort: 53
+      protocol: UDP
+      name: dns-udp

kubernetes/app/pihole/service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: pihole
+  namespace: pihole
+spec:
+  selector:
+    app: pihole
+  ports:
+    - port: 80
+      targetPort: 80
+      name: http