Test nslookup different k8s namespaces

README.md

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

---
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

---
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