Upd: Allow for setting the DNS policy for the pod

helm/mail/templates/statefulset.yaml

@@ -176,6 +176,32 @@ spec:
         {{- if .Values.extraContainers }}
         {{- tpl .Values.extraContainers $root | nindent 8 }}
         {{- end }}
+      {{- if .Values.dns.policy }}
+      dnsPolicy: {{- .Values.dns.policy }}
+      {{- end }}
+      {{- if or .Values.dns.nameservers .Values.dns.searches .Values.dns.options }}
+      dnsConfig:
+        {{- if .Values.dns.nameservers }}
+        nameservers:
+          {{- range .Values.dns.nameservers }}
+          - {{ . }}
+          {{- end }}
+        {{- end }}
+        {{- if .Values.dns.searches }}
+        searches: {{- .Values.dns.searches | nindent 4 }}
+        {{- end }}
+        {{- if .Values.dns.options }}
+        options:
+          {{- range .Values.dns.options }}
+          {{- if .name }}
+          - name: {{ .name }}
+            {{- if .value }}
+            value: {{ .value | quote }}
+            {{- end }}
+          {{- end }}
+          {{- end }}
+        {{- end }}
+      {{- end }}
       volumes:
             {{- if .Values.certs.create }}
         - name: certs-init

helm/mail/values.yaml

@@ -169,6 +169,20 @@ config:
     # e.g.
     # RequireSafeKeys: "yes"
 
+dns:
+  policy: ""
+  # policy: "None"
+  nameservers: {}
+    # - 8.8.8.8
+    # - 8.8.4.4
+  searches: ""
+  # searches: "default.svc.cluster.local svc.cluster.local cluster.local"
+  options: {}
+  # options:
+  #   ndots:
+  #     - name: ndots
+  #       value: "5"
+
 persistence:
   enabled: true
   accessModes:

helm/test_14_test_dns_policy.yml

@@ -0,0 +1,10 @@
+dns:
+  policy: "None"
+  nameservers:
+    - 8.8.8.8
+    - 8.8.4.4
+  searches: "default.svc.cluster.local svc.cluster.local cluster.local"
+  options:
+    ndots:
+      - name: ndots
+        value: "5"