I'm currently creating a Kubernetes cluster in Azure Kubernetes for a production environment. In my cluster, I will have single node in the node pool - pool1.

Now, I want to deploy an application with 2 replicas as shown below

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment-1
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16.1

on which port the application will listen to? as two pods will be deployed on the same node, how does the port will be allocated?

Update: As suggested, have updated the manifest with service definition.

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16.1
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: web
spec:
  selector:
    app: nginx
  ports:
  - protocol: TCP
    port: 80
    targetport: 80
  type: LoadBalancer