README.md

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+```
+kubectl apply -f pruebans1.yml
+kubectl apply -f pruebans2.yml
+```
+
+```
+kubectl exec -ti $(kubectl get pods -n pruebans1 --no-headers -o custom-columns=":metadata.name")  -n pruebans1 -- nslookup pruebans2.pruebans2
+```

gistfile1.txt

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: pruebans2
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    app: pruebans2
+  name: pruebans2
+  namespace: pruebans2
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: pruebans2
+    spec:
+      containers:
+      - image: busybox:1.28
+        name: pruebans2
+        command: [ "sh", "-c", "while true; do echo $(hostname); sleep 60; done" ]
+        ports:
+        - name: http
+          containerPort: 80
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: pruebans2
+  namespace: pruebans2
+spec:
+  ports:
+  - name: pruebans2
+    port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: pruebans2

pruebans1.yml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: pruebans1
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    app: pruebans1
+  name: pruebans1
+  namespace: pruebans1
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: pruebans1
+    spec:
+      containers:
+      - image: busybox:1.28
+        name: pruebans1
+        command: [ "sh", "-c", "while true; do echo $(hostname); sleep 60; done" ]
+        ports:
+        - name: http
+          containerPort: 80
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: pruebans1
+  namespace: pruebans1
+spec:
+  ports:
+  - name: pruebans1
+    port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: pruebans1