title: kubernetes cannot ping another service
body: <p>DNS resolution looks fine, but I cannot ping my service. What could be the reason?</p>
  
  <p>From another pod in the cluster:</p>
  
  <pre><code>$ ping backend
  PING backend.default.svc.cluster.local (10.233.14.157) 56(84) bytes of data.
  
  
  ^C
  --- backend.default.svc.cluster.local ping statistics ---
  36 packets transmitted, 0 received, 100% packet loss, time 35816ms
  </code></pre>
  
  <p>EDIT:</p>
  
  <p>The service definition:</p>
  
  <pre><code>apiVersion: v1
  kind: Service
  metadata:
    labels:
      app: backend
    name: backend
  spec:
    ports:
    - name: api
      protocol: TCP
      port: 10000
    selector:
      app: backend
  </code></pre>
  
  <p>The deployment:</p>
  
  <pre><code>apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: backend
    labels:
      app: backend
  spec:
    replicas: 1
    selector:
      matchLabels:
        run: backend
    replicas: 1
    template:
      metadata:
        labels:
          run: backend
      spec:
        containers:
        - name: backend
          image: nha/backend:latest
          imagePullPolicy: Always
          ports:
          - name: api
            containerPort: 10000
  </code></pre>
  
  <p>I can <code>curl</code> my service from the same container:</p>
  
  <pre><code>kubectl exec -it backend-7f67c8cbd8-mf894 -- /bin/bash
  root@backend-7f67c8cbd8-mf894:/# curl localhost:10000/my-endpoint
  {"ok": "true"}
  </code></pre>
  
  <p>It looks like the endpoint on port <code>10000</code> does not get exposed though:</p>
  
  <pre><code> kubectl get ep
  NAME         ENDPOINTS                                                       AGE
  backend      &lt;none&gt;                                                          2h
  </code></pre>