How to expose multiple port using a load balancer services in Kubernetes

Question

I have created a cluster using the google cloud platform (container engine) and deployed a pod using the following YAML file:

apiVersion: extensions/v1beta1 kind: Deployment metadata:    name: deployment-name spec:   replicas: 1   template:     metadata:       name: pod-name       labels:          app: app-label     spec:       containers:        - name: container-name       image: gcr.io/project-id/image-name       resources:         requests:           cpu: 1       ports:       - name: port80         containerPort: 80       - name: port443         containerPort: 443       - name: port6001         containerPort: 6001 

Then I want to create a service that enables the pod to listen on all these ports. I know that the following YAML file works to create a service that listens on one port:

apiVersion: v1 kind: Service metadata:    name: service-name spec:       ports:   - port: 80     targetPort: 80   selector:      app: app-label   type: LoadBalancer 

However when I want the pod to listen on multiple ports like this, it doesn't work:

apiVersion: v1 kind: Service metadata:    name: service-name spec:       ports:   - port: 80     targetPort: 80   - port: 443     targetPort: 443   - port: 6001     targetPort: 6001   selector:      app: app-label   type: LoadBalancer 

How can I make my pod listen to multiple ports?

Answer 1

You have two options:

1. You could have multiple services, one for each port. As you pointed out, each service will end up with a different IP address
2. You could have a single service with multiple ports. In this particular case, you must give all ports a name.

In your case, the service becomes:

apiVersion: v1 kind: Service metadata:   name: service-name spec:   ports:   - name: http     port: 80     targetPort: 80   - name: https     port: 443     targetPort: 443   - name: something     port: 6001     targetPort: 6001   selector:     app: app-label   type: LoadBalancer 

This is necessary so that endpoints can be disambiguated.