Custom Nginx Ingress Controller on Google Container Engine

gcloud config set project gcloud-zihao
gcloud config set compute/zone us-east1-b
export CLUSTER_NAME=zihao

# create load balancer's static ip
gcloud compute addresses create $CLUSTER_NAME-ip --region us-east1
export LB_ADDRESS_IP=$(gcloud compute addresses list | grep $CLUSTER_NAME-ip | awk '{print $3}')
gcloud compute addresses list

# create cluster with one instance
gcloud container clusters create $CLUSTER_NAME --addons HorizontalPodAutoscaling,KubernetesDashboard --disk-size=30 --machine-type=n1-standard-1 --num-nodes=1 --zone us-east1-b
gcloud container clusters get-credentials $CLUSTER_NAME

# re-assign static ip to instance
export LB_INSTANCE_NAME=$(kubectl describe nodes | head -n1 | awk '{print $2}')
export LB_INSTANCE_NAT=$(gcloud compute instances describe $LB_INSTANCE_NAME | grep -A3 networkInterfaces: | tail -n1 | awk -F': ' '{print $2}')
gcloud compute instances delete-access-config $LB_INSTANCE_NAME \
    --access-config-name "$LB_INSTANCE_NAT"
gcloud compute instances add-access-config $LB_INSTANCE_NAME \
    --access-config-name "$LB_INSTANCE_NAT" --address $LB_ADDRESS_IP

# label our load balancer node
kubectl label nodes $LB_INSTANCE_NAME role=load-balancer

# enable http ports for load balancer
gcloud compute instances add-tags $LB_INSTANCE_NAME --tags http-server,https-server

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: default-http-backend
  labels:
    app: default-http-backend
  namespace: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: default-http-backend
  template:
    metadata:
      labels:
        app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        # Any image is permissible as long as:
        # 1. It serves a 404 page at /
        # 2. It serves 200 on a /healthz endpoint
        image: gcr.io/google_containers/defaultbackend:1.4
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
---
apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  namespace: ingress-nginx
  labels:
    app: default-http-backend
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: default-http-backend
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app: ingress-nginx
data:
  hsts-include-subdomains: "false"
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
data:
  1194: "default/openvpn-openvpn:1194"
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: udp-services
  namespace: ingress-nginx
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ingress-nginx
  template:
    metadata:
      labels:
        app: ingress-nginx
      annotations:
        prometheus.io/port: '10254'
        prometheus.io/scrape: 'true'
    spec:
      # hostNetwork makes it possible to use ipv6 and to preserve the source IP correctly regardless of docker configuration
      # however, it is not a hard dependency of the nginx-ingress-controller itself and it may cause issues if port 10254 already is taken on the host
      # that said, since hostPort is broken on CNI (https://github.com/kubernetes/kubernetes/issues/31307) we have to use hostNetwork where CNI is used
      # like with kubeadm
      hostNetwork: true
      nodeSelector:
        role: load-balancer
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.12.0
          args:
            - /nginx-ingress-controller
            - --default-backend-service=$(POD_NAMESPACE)/default-http-backend
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --annotations-prefix=nginx.ingress.kubernetes.io
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
          - name: http
            containerPort: 80
            hostPort: 80
          - name: https
            containerPort: 443
            hostPort: 443
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 1
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 1
          resources:
            limits:
              cpu: 50m
              memory: 100Mi
            requests:
              cpu: 10m
              memory: 50Mi

# install nginx ingres controller with hostPort
kubectl apply -f nginx-ingress-controller.yaml