Accessing Kubernetes service on port 80

If you don't use any cloudproviders, you can just set externalIPs option in service and make this IP up on node, and kube-proxy will route traffic from this IP to your pod for you.

{    "kind": "Service",    "apiVersion": "v1",    "metadata": {        "name": "my-service"    },    "spec": {        "selector": {            "app": "MyApp"        },        "ports": [            {                "name": "http",                "protocol": "TCP",                "port": 80,                "targetPort": 9376            }        ],        "externalIPs" : [            "80.11.12.10"        ]    }}

https://kubernetes.io/docs/concepts/services-networking/service/#external-ips

If you want to use cloud provider's LB, assuming your app expose on port 8080 and you want to publicly expose it on port 80, here is how the configuration should look:

apiVersion: v1kind: Servicemetadata:  name: flask_app  labels:    run: flask_app  namespace: defaultspec:  type: LoadBalancer  ports:  - port: 80    targetPort: 8080    protocol: TCP    name: http  selector:    run: flask_app---apiVersion: extensions/v1beta1kind: Deploymentmetadata:  name: flask_app  namespace: defaultspec:  replicas: 1  strategy:    rollingUpdate:      maxSurge: 1      maxUnavailable: 0    type: RollingUpdate  template:    metadata:      labels:        run: flask_app    spec:      restartPolicy: Always      terminationGracePeriodSeconds: 60      containers:      - name: flask_app        image: repo/flask_app:latest        ports:        - containerPort: 8080        imagePullPolicy: Always

Another option is to use a Ingress Controller, for example Nginx.

https://kubernetes.io/docs/concepts/services-networking/ingress/