Add kubernetes Ingress backend

Signed-off-by: Emile Vauge <emile@vauge.com>

examples/compose-k8s.yaml

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+# etcd:
+#   image: gcr.io/google_containers/etcd:2.2.1
+#   net: host
+#   command: ['/usr/local/bin/etcd', '--addr=127.0.0.1:4001', '--bind-addr=0.0.0.0:4001', '--data-dir=/var/etcd/data']
+
+kubelet:
+  image: gcr.io/google_containers/hyperkube-amd64:v1.2.2
+  privileged: true
+  pid: host
+  net : host
+  volumes:
+    - /:/rootfs:ro
+    - /sys:/sys:ro
+    - /var/lib/docker/:/var/lib/docker:rw
+    - /var/lib/kubelet/:/var/lib/kubelet:rw
+    - /var/run:/var/run:rw
+  command: ['/hyperkube', 'kubelet', '--containerized', '--hostname-override=127.0.0.1', '--address=0.0.0.0', '--api-servers=http://localhost:8080', '--config=/etc/kubernetes/manifests', '--allow-privileged=true', '--v=2']

examples/k8s.ingress.yaml

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+# 3 Services for the 3 endpoints of the Ingress
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami-x
+  labels:
+    app: whoami
+spec:
+  type: NodePort
+  ports:
+  - port: 80
+    nodePort: 30301
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: whoami
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami-default
+  labels:
+    app: whoami
+spec:
+  type: NodePort
+  ports:
+  - port: 80
+    nodePort: 30302
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: whoami
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami-y
+  labels:
+    app: whoami
+spec:
+  type: NodePort
+  ports:
+  - port: 80
+    nodePort: 30284
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: whoami
+---
+# A single RC matching all Services
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: whoami
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: whoami
+    spec:
+      containers:
+      - name: whoami
+        image: emilevauge/whoami
+        ports:
+        - containerPort: 80
+---
+# An Ingress with 2 hosts and 3 endpoints
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: whoamimap
+spec:
+  rules:
+  - host: foo.localhost
+    http:
+      paths:
+      - path: /bar
+        backend:
+          serviceName: whoami-x
+          servicePort: 80
+  - host: bar.localhost
+    http:
+      paths:
+      - backend:
+          serviceName: whoami-y
+          servicePort: 80
+      - backend:
+          serviceName: whoami-x
+          servicePort: 80

examples/k8s.namespace.sh

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+#!/bin/bash
+
+kubectl create -f - << EOF
+kind: Namespace
+apiVersion: v1
+metadata:
+  name: kube-system
+  labels:
+    name: kube-system
+EOF

examples/k8s.rc.yaml

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+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: traefik-ingress-controller
+  labels:
+    k8s-app: traefik-ingress-lb
+spec:
+  replicas: 1
+  selector:
+    k8s-app: traefik-ingress-lb
+  template:
+    metadata:
+      labels:
+        k8s-app: traefik-ingress-lb
+        name: traefik-ingress-lb
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+      - image: containous/traefik:k8s
+        name: traefik-ingress-lb
+        imagePullPolicy: Always
+        # livenessProbe:
+        #   httpGet:
+        #     path: /healthz
+        #     port: 10249
+        #     scheme: HTTP
+        #   initialDelaySeconds: 30
+        #   timeoutSeconds: 5
+        ports:
+        - containerPort: 80
+          hostPort: 80
+        - containerPort: 443
+          hostPort: 443
+        args:
+        - --kubernetes
+        - --logLevel=DEBUG