Add configuration for retries in non-idempotent requests

controllers/nginx/examples/udp/README.md

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+
+To configure which services and ports will be exposed
+```
+kubectl create -f udp-configmap-example.yaml
+```
+
+The file `udp-configmap-example.yaml` uses a ConfigMap where the key is the external port to use and the value is
+`<namespace/service name>:<service port>`
+It is possible to use a number or the name of the port.
+
+```
+kubectl create -f rc-udp.yaml
+```

controllers/nginx/examples/udp/rc-udp.yaml

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+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: nginx-ingress-controller
+  labels:
+    k8s-app: nginx-ingress-lb
+spec:
+  replicas: 1
+  selector:
+    k8s-app: nginx-ingress-lb
+  template:
+    metadata:
+      labels:
+        k8s-app: nginx-ingress-lb
+        name: nginx-ingress-lb
+    spec:
+      containers:
+      - image: aledbf/nginx-third-party:0.9
+        name: nginx-ingress-lb
+        imagePullPolicy: Always
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 10249
+            scheme: HTTP
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        # use downward API
+        env:
+          - name: POD_IP
+            valueFrom:
+              fieldRef:
+                fieldPath: status.podIP
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.name
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
+        ports:
+        - containerPort: 80
+          hostPort: 80
+        - containerPort: 443
+          hostPort: 4444
+        # we expose 8080 to access nginx stats in url /nginx-status
+        # this is optional
+        - containerPort: 8080
+          hostPort: 8081
+        - containerPort: 53
+          hostPort: 53
+        args:
+        - /nginx-ingress-controller
+        - --default-backend-service=default/default-http-backend
+        - --udp-services-configmap=default/udp-configmap-example

controllers/nginx/examples/udp/udp-configmap-example.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: udp-configmap-example
+data:
+  53: "kube-system/kube-dns:53"