feat: support custom labels for internal service

This change allows configuring labels specifically for the internal
service without affecting the main controller service, useful for
external-dns configuration.

The commit also includes minor YAML indentation fixes in the
deployment template.

Author: samuelarogbonlo

charts/ingress-nginx/ci/controller-service-internal-labels-values.yaml

@@ -0,0 +1,17 @@
+controller:
+  name: controller
+  kind: Deployment
+  image:
+    registry: registry.k8s.io
+    image: ingress-nginx/controller
+    tag: "v1.12.0"
+  service:
+    enabled: true
+    internal:
+      enabled: true
+      type: ClusterIP
+      labels:
+        external-dns.alpha.kubernetes.io/hostname: internal.example.com
+        custom-label: test-value
+    labels:
+      regular-service-label: should-not-appear-on-internal

charts/ingress-nginx/templates/controller-deployment.yaml

@@ -31,12 +31,12 @@ spec:
   minReadySeconds: {{ .Values.controller.minReadySeconds }}
   template:
     metadata:
-    {{- if .Values.controller.podAnnotations }}
+      {{- if .Values.controller.podAnnotations }}
       annotations:
-      {{- range $key, $value := .Values.controller.podAnnotations }}
+        {{- range $key, $value := .Values.controller.podAnnotations }}
         {{ $key }}: {{ $value | quote }}
+        {{- end }}
       {{- end }}
-    {{- end }}
       labels:
         {{- include "ingress-nginx.labels" . | nindent 8 }}
         app.kubernetes.io/component: controller

charts/ingress-nginx/templates/controller-service-internal.yaml

@@ -1,4 +1,4 @@
-{{- if and .Values.controller.service.enabled .Values.controller.service.internal.enabled .Values.controller.service.internal.annotations -}}
+{{- if and .Values.controller.service.enabled .Values.controller.service.internal.enabled -}}
 apiVersion: v1
 kind: Service
 metadata:
@@ -9,8 +9,8 @@ metadata:
   labels:
     {{- include "ingress-nginx.labels" . | nindent 4 }}
     app.kubernetes.io/component: controller
-  {{- if .Values.controller.service.labels }}
-    {{- toYaml .Values.controller.service.labels | nindent 4 }}
+  {{- if .Values.controller.service.internal.labels }}
+    {{- toYaml .Values.controller.service.internal.labels | nindent 4 }}
   {{- end }}
   name: {{ include "ingress-nginx.controller.fullname" . }}-internal
   namespace: {{ include "ingress-nginx.namespace" . }}

charts/ingress-nginx/values.yaml

@@ -25,6 +25,14 @@ controller:
   image:
     ## Keep false as default for now!
     chroot: false
+  service:
+    internal:
+      # Enable the internal service for ingress traffic
+      enabled: false
+      # -- Annotations to be added to internal service
+      annotations: {}
+      # -- Additional custom labels for internal service specifically, useful for external-dns configuration
+      labels: {}
     # registry: registry.k8s.io
     image: ingress-nginx/controller
     ## for backwards compatibility consider setting the full image url via the repository value below