Networking between two pods

Question

I'm still a noob in kubernetes. it would be great if someone gave me an example with yaml file for the following requirement:

• I need two pods running 
• One as backend and the other as frontend
• I need a way to network between them

Answer 1

Define service resources for both your front-end and back-end application, this allows communication between them which is required for networking.

apiVersion: v1
kind: Service
metadata:
  name: backend
spec:
  selector:
    app: backend
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

Next you define the ingress resources since both the services need access from outside the cluster.

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: frontend
spec:      
  rules:
  - host: www.your-application.example
    http:
      paths:
      - path: /
        backend:
          serviceName: frontend
          servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: backend
spec:      
  rules:
  - host: api.your-application.example
    http:
      paths:
      - path: /
        backend:
          serviceName: backend
          servicePort: 80