Update Pi-hole and ExternalDNS configuration examples

Improve YAML examples with better comments and clarifications for the Tailscale integration guide. Fix namespace reference in ExternalDNS configuration and enable service source for DNS record creation.

Author: rajsinghtech

content/post/byod-gatewayapi-tailscale/index.md

@@ -205,26 +205,20 @@ Create `pihole-values.yaml`. This exposes Pi-hole's DNS (port 53) as a Tailscale
 ```yaml
 # pihole-values.yaml
 admin:
-  existingSecret: "pihole-admin-secret"
-  passwordKey: password
-
+  existingSecret: "pihole-admin-secret" # Name of the K8s secret created above
+  passwordKey: password # Key within the secret
 extraEnvVars:
   FTLCONF_dns_listeningMode: 'all'
-
 serviceDns:
   type: LoadBalancer
-  loadBalancerClass: tailscale
+  loadBalancerClass: tailscale # Expose DNS service via Tailscale
   port: 53
   annotations:
-    # USER: Replace with your desired Tailscale FQDN for Pi-hole DNS
-    "tailscale.com/hostname": "pihole-dns"
-
+    "tailscale.com/hostname": "pihole-dns" # USER: Replace with your desired Tailscale FQDN for Pi-hole DNS
 serviceWeb:
   type: ClusterIP # Keep web UI internal
-
 ingressWeb:
   enabled: false # Disable Pi-hole's ingress if managing access differently
-
 podDnsConfig:
   enabled: false # Avoid conflicts with cluster DNS
 ```
@@ -247,37 +241,30 @@ Create `external-dns-pihole-values.yaml` to configure ExternalDNS for your Pi-ho
 fullnameOverride: external-dns-pihole
 image:
   tag: v0.17.0
-logLevel: debug # Or info
 provider: pihole
-
 env:
   - name: EXTERNAL_DNS_PIHOLE_PASSWORD
     valueFrom:
       secretKeyRef:
         name: pihole-admin-secret # Match secret name for Pi-hole
-        key: password            # Match key in secret
-
+        key: password # Match key in secret
 extraArgs:
   # USER: Adjust Pi-hole server URL if service name/namespace differs.
   # Points to Pi-hole web admin (port 80 internally).
-  # Assumes Pi-hole in 'pihole-ns', release 'pihole' (service: 'pihole-web').
+  # Assumes Pi-hole in 'tailscale', release 'pihole' (service: 'pihole-web').
   - --pihole-server=http://pihole-web.tailscale
   - --pihole-api-version=6
   # USER: Customize label selector to match your Gateway resources.
   - --gateway-label-filter=external-dns==example # Matches label in main guide's Gateway
-
 policy: sync # Or "upsert-only"
-
 sources:
   - gateway-httproute # For hostnames in HTTPRoutes attached to labeled Gateways
-  # - service # To create DNS for annotated K8s services
+  - service # To create DNS for annotated K8s services
   # - ingress # If using Ingress resources
-
 # USER: Define domain(s) for ExternalDNS to manage in Pi-hole (e.g., "example.com").
 domainFilters:
   - "example.com"
   # - "another.internal.domain"
-
 # USER: Customize for TXT record identification.
 txtOwnerId: "my-k8s-cluster-pihole"
 txtPrefix: "k8s-edns-"