<p>I am trying to expose deployment using Ingress where DeamonSet has <code>hostNetwork=true</code> which would allow me to skip additional LoadBalancer layer and expose my service directly on the Kubernetes external node IP. Unfortunately I can't reach the Ingress controller from the external network.</p>

<p>I am running Kubernetes version 1.11.16-gke.2 on GCP.</p>

<p>I setup my fresh cluster like this:</p>

<pre><code>gcloud container clusters get-credentials gcp-cluster

kubectl create serviceaccount --namespace kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
helm init --service-account tiller --upgrade

helm install --name ingress --namespace ingress-nginx --set rbac.create=true,controller.kind=DaemonSet,controller.service.type=ClusterIP,controller.hostNetwork=true stable/nginx-ingress
</code></pre>

<p>I run the deployment:</p>

<pre><code>cat &lt;&lt;EOF | kubectl create -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-node
spec:
  selector:
      matchLabels:
        app: hello-node
  template:
    metadata:
      labels:
        app: hello-node
    spec:
      containers:
      - name: hello-node
        image: gcr.io/google-samples/node-hello:1.0
        ports:
        - containerPort: 8080
EOF
</code></pre>

<p>Then I create service:</p>

<pre><code>cat &lt;&lt;EOF | kubectl create -f -
apiVersion: v1
kind: Service
metadata:
  name: hello-node
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: hello-node
EOF
</code></pre>

<p>and ingress resource:</p>

<pre><code>cat &lt;&lt;EOF | kubectl create -f -
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
  name: hello-node-single-ingress    
spec:
  backend:
    serviceName: hello-node
    servicePort: 80
EOF
</code></pre>

<p>I get the node external IP:</p>

<pre><code>12:50 $ kubectl get nodes -o json | jq '.items[] | .status .addresses[] | select(.type=="ExternalIP") | .address'
"35.197.204.75"
</code></pre>

<p>Check if ingress is running:</p>

<pre><code>12:50 $ kubectl get ing
NAME                        HOSTS   ADDRESS         PORTS   AGE
hello-node-single-ingress   *       35.197.204.75   80      8m

12:50 $ kubectl get pods --namespace ingress-nginx
NAME                                                     READY   STATUS    RESTARTS   AGE
ingress-nginx-ingress-controller-7kqgz                   1/1     Running   0          23m
ingress-nginx-ingress-default-backend-677b99f864-tg6db   1/1     Running   0          23m

12:50 $ kubectl get svc --namespace ingress-nginx
NAME                                    TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
ingress-nginx-ingress-controller        ClusterIP   10.43.250.102   &lt;none&gt;        80/TCP,443/TCP   24m
ingress-nginx-ingress-default-backend   ClusterIP   10.43.255.43    &lt;none&gt;        80/TCP           24m
</code></pre>

<p>Then trying to connect from the external network:</p>

<pre><code>curl 35.197.204.75 
</code></pre>

<p>Unfortunately it times out</p>

<p>On Kubernetes Github there is a page regarding ingress-nginx (host-netork: true) setup: 
<a href="https://kubernetes.github.io/ingress-nginx/deploy/baremetal/#via-the-host-network" rel="nofollow noreferrer">https://kubernetes.github.io/ingress-nginx/deploy/baremetal/#via-the-host-network</a></p>

<p>which mentions:</p>

<p><em>"This approach does not leverage any Service object to expose the NGINX Ingress controller. If the ingress-nginx Service exists in the target cluster, it is recommended to delete it."</em></p>

<p>I've tried to follow that and delete <code>ingress-nginx</code> services:</p>

<pre><code>kubectl delete svc --namespace ingress-nginx ingress-nginx-ingress-controller ingress-nginx-ingress-default-backend
</code></pre>

<p>but this doesn't help.</p>

<p>Any ideas how to set up the Ingress on the node external IP? What I am doing wrong? The amount of confusion over running Ingress reliably without the LB overwhelms me. Any help much appreciated !</p>

<p>EDIT:
When another service accessing my deployment with <code>NodePort</code> gets created:</p>

<pre><code>cat &lt;&lt;EOF | kubectl create -f -
apiVersion: v1
kind: Service
metadata:
  name: hello-node2
spec:
  ports:
  - port: 80
    targetPort: 8080
  type: NodePort
  selector:
    app: hello-node
EOF


NAME          TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
hello-node    ClusterIP   10.47.246.91   &lt;none&gt;        80/TCP         2m
hello-node2   NodePort    10.47.248.51   &lt;none&gt;        80:31151/TCP   6s
</code></pre>

<p>I still can't access my service e.g. using: <code>curl 35.197.204.75:31151</code>.</p>

<p>However when I create 3rd service with LoadBalancer type:</p>

<pre><code>cat &lt;&lt;EOF | kubectl create -f -
apiVersion: v1
kind: Service
metadata:
  name: hello-node3
spec:
  ports:
  - port: 80
    targetPort: 8080
  type: LoadBalancer
  selector:
    app: hello-node
EOF

NAME          TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)        AGE
hello-node    ClusterIP      10.47.246.91   &lt;none&gt;           80/TCP         7m
hello-node2   NodePort       10.47.248.51   &lt;none&gt;           80:31151/TCP   4m
hello-node3   LoadBalancer   10.47.250.47   35.189.106.111   80:31367/TCP   56s
</code></pre>

<p>I can access my service using the external LB: <code>35.189.106.111</code> IP.</p>

<p>The problem was missing firewall rules on GCP.</p>

<p>Found the answer: <a href="https://stackoverflow.com/a/42040506/2263395">https://stackoverflow.com/a/42040506/2263395</a></p>

<p>Running: </p>

<pre><code>gcloud compute firewall-rules create myservice --allow tcp:80,tcp:30301
</code></pre>

<p>Where <code>80</code> is the ingress port and <code>30301</code> is the NodePort port. On production you would probabaly use just the ingress port.</p>
