[stable/nginx-ingress] Allow to configure source IP preservation on Kubernetes 1.7 (#1570)

* Set externalTrafficPolicy and healthCheckNodePort

* Rebase & address PR review

* Remove duplicate fields

* Final cleanup

stable/nginx-ingress/Chart.yaml

@@ -1,5 +1,5 @@
 name: nginx-ingress
-version: 0.8.2
+version: 0.8.3
 appVersion: 0.9.0-beta.12
 description: An nginx Ingress controller that uses ConfigMap to store the nginx configuration.
 icon: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Nginx_logo.svg/500px-Nginx_logo.svg.png

stable/nginx-ingress/templates/controller-service.yaml

@@ -25,8 +25,11 @@ spec:
   loadBalancerSourceRanges:
 {{ toYaml .Values.controller.service.loadBalancerSourceRanges | indent 4 }}
 {{- end }}
-{{- if .Values.controller.service.externalTrafficPolicy }}
+{{- if and (ge .Capabilities.KubeVersion.Minor "7") (.Values.controller.service.externalTrafficPolicy) }}
   externalTrafficPolicy: "{{ .Values.controller.service.externalTrafficPolicy }}"
+{{- end }}
+{{- if and (ge .Capabilities.KubeVersion.Minor "7") (.Values.controller.service.healthCheckNodePort) }}
+  healthCheckNodePort: {{ .Values.controller.service.healthCheckNodePort }}
 {{- end }}
   ports:
     - name: http

stable/nginx-ingress/values.yaml

@@ -90,6 +90,8 @@ controller:
     ## Ref: https://kubernetes.io/docs/tutorials/services/source-ip/#source-ip-for-services-with-typeloadbalancer
     externalTrafficPolicy: ""
 
+    healthCheckNodePort: 0
+
     targetPorts:
       http: 80
       https: 443