Fix #140: Adding headless service for newer versions of Kubernetes

helm/mail/templates/service.yaml

@@ -22,3 +22,27 @@ spec:
       {{ if eq .Values.service.type "NodePort" }}nodePort: {{ .Values.service.nodePort }}{{ end }}
   selector:
     {{- $selectorLabels | nindent 4 }}
+---
+# https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#limitations
+# StefullSets now require a headless service
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ print $fullName "-headless" | quote }}
+  namespace: {{ .Release.Namespace | quote }}
+  labels:
+    {{- $labels | nindent 4 }}
+    {{- with .Values.service.labels }}{{ toYaml . | nindent 4 }}{{ end }}
+  annotations:
+    {{- with .Values.service.annotations }}{{ toYaml . | nindent 4 }}{{ end }}
+spec:
+  type: ClusterIP
+  clusterIP: None
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: smtp
+      protocol: TCP
+      name: smtp
+      {{ if eq .Values.service.type "NodePort" }}nodePort: {{ .Values.service.nodePort }}{{ end }}
+  selector:
+    {{- $selectorLabels | nindent 4 }}