<p>I created my Kubernetes cluster and I try to deploy this yaml file:</p>
<pre><code>apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
spec:
  selector:
    matchLabels:
      app: httpd
  replicas: 1
  template:
    metadata:
      labels:
        app: httpd
    spec:
      containers:
      - name: httpd
        image: httpd
        ports:
        - containerPort: 80
---
kind: Service
apiVersion: v1
metadata:
  name: httpd-service
spec:
  selector:
    app: httpd-app
  ports:  
    - protocol: TCP
      port: 8080
      targetPort: 80
      nodePort: 30020
      name: httpd-port
  type: NodePort
</code></pre>
<p>This is the configuration:</p>
<pre><code>[root@BCA-TST-K8S01 httpd-deploy]# kubectl get all -o wide
NAME                                    READY   STATUS    RESTARTS   AGE     IP          NODE               NOMINATED NODE   READINESS GATES
pod/httpd-deployment-57fc687dcc-rggx9   1/1     Running   0          8m51s   10.44.0.1   bcc-tst-docker02   &lt;none&gt;           &lt;none&gt;

NAME                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE     SELECTOR
service/httpd-service   NodePort    10.102.138.175   &lt;none&gt;        8080:30020/TCP   8m51s   app=httpd-app
service/kubernetes      ClusterIP   10.96.0.1        &lt;none&gt;        443/TCP          134m    &lt;none&gt;

NAME                               READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS   IMAGES   SELECTOR
deployment.apps/httpd-deployment   1/1     1            1           8m51s   httpd        httpd    app=httpd

NAME                                          DESIRED   CURRENT   READY   AGE     CONTAINERS   IMAGES   SELECTOR
replicaset.apps/httpd-deployment-57fc687dcc   1         1         1       8m51s   httpd        httpd    app=httpd,pod-template-hash=57fc687dcc
</code></pre>
<p>But I can't connect to the worker or from the cluster IP:</p>
<pre><code>curl http://bcc-tst-docker02:30020
curl: (7) Failed to connect to bcc-tst-docker02 port 30020: Connection refused
</code></pre>
<p>How can I fix the problem?
How can expose the cluster using the internal Matser IP (for example I need to access to the httpd-deploy from the master IP 10.100.170.150 open a browser in the same network)</p>
<p><strong>UPDATE:</strong></p>
<p>I modified my yaml file as below:</p>
<pre><code>apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
spec:
  selector:
    matchLabels:
      app: httpd-app
  replicas: 2
  template:
    metadata:
      labels:
        app: httpd-app
    spec:
      containers:
      - name: httpd
        image: httpd
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: http-service
spec:
  externalIPs:
  - 10.100.170.150               **--&gt; IP K8S**
  externalTrafficPolicy: Cluster
  ports:
  - name: httpd-port
    protocol: TCP
    port: 8080
    targetPort: 80
    nodePort: 30020
  selector:
    app: httpd-app
  sessionAffinity: None
  type: LoadBalancer
</code></pre>
<p>And these are the result after I run apply command:</p>
<pre><code>[root@K8S01 LoadBalancer]# kubectl get all -o wide
NAME                                    READY   STATUS    RESTARTS   AGE   IP          NODE               NOMINATED NODE   READINESS GATES
pod/httpd-deployment-65d64d47c5-72xp4   1/1     Running   0          60s   10.44.0.2   bcc-tst-docker02   &lt;none&gt;           &lt;none&gt;
pod/httpd-deployment-65d64d47c5-fc645   1/1     Running   0          60s   10.36.0.1   bca-tst-docker01   &lt;none&gt;           &lt;none&gt;

NAME                   TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)          AGE   SELECTOR
service/http-service   LoadBalancer   10.100.236.203   10.100.170.150   8080:30020/TCP   60s   app=httpd-app
service/kubernetes     ClusterIP      10.96.0.1        &lt;none&gt;           443/TCP          13d   &lt;none&gt;

NAME                               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES   SELECTOR
deployment.apps/httpd-deployment   2/2     2            2           60s   httpd        httpd    app=httpd-app

NAME                                          DESIRED   CURRENT   READY   AGE   CONTAINERS   IMAGES   SELECTOR
replicaset.apps/httpd-deployment-65d64d47c5   2         2         2       60s   httpd        httpd    app=httpd-app,pod-template-hash=65d64d47c5
</code></pre>
<p>but now when I try to connect to the httpd using K8S IP I receive these error:</p>
<pre><code>[root@K8S01 LoadBalancer]# curl http://10.100.170.150:8080
curl: (7) Failed to connect to 10.100.170.150 port 8080: No route to host
[root@K8S01 LoadBalancer]# curl http://10.100.236.203:8080
curl: (7) Failed to connect to 10.100.236.203 port 8080: No route to host
</code></pre>
<p>If I try to connect directly to the node I can connect:</p>
<pre><code>[root@K8S01 LoadBalancer]# curl http://bca-tst-docker01:30020
&lt;html&gt;&lt;body&gt;&lt;h1&gt;It works!&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;
[root@K8S01 LoadBalancer]# curl http://bcc-tst-docker02:30020
&lt;html&gt;&lt;body&gt;&lt;h1&gt;It works!&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;
</code></pre>

<p>You're are getting the <code>connection refused</code> because the service does not have any endpoints behind it since your label selector is different from the deployment level.</p>
<p>The deployment has <code>httpd</code> label while the service is trying to catch all the deployments with  <code>httpd-app</code>. Below you can find corrected selector:</p>
<pre class="lang-yaml prettyprint-override"><code>kind: Service
apiVersion: v1
metadata:
  name: httpd-service
spec:
  selector:
    app: httpd  &lt;-------
  ports:  
    - protocol: TCP
      port: 8080
      targetPort: 80
      nodePort: 30020
      name: httpd-port
  type: NodePort
</code></pre>
<p>You can always verify if the service has endpoints. Kubernetes has a great section about debugging services and one of it is called: <a href="https://kubernetes.io/docs/tasks/debug-application-cluster/debug-service/#does-the-service-have-any-endpoints" rel="nofollow noreferrer">Does the Service have any Endpoints?</a></p>
