concept multiple port in category kubernetes

This is an excerpt from Manning's book Kubernetes in Action. Login to get full access to this book.

Exposing multiple ports in the same service

Your service exposes only a single port, but services can also support multiple ports. For example, if your pods listened on two ports—let’s say 8080 for HTTP and 8443 for HTTPS—you could use a single service to forward both port 80 and 443 to the pod’s ports 8080 and 8443. You don’t need to create two different services in such cases. Using a single, multi-port service exposes all the service’s ports through a single cluster IP.

Listing 5.3. Specifying multiple ports in a service definition

apiVersion: v1
kind: Service
metadata:
  name: kubia
spec:
  ports:
  - name: http              #1
    port: 80                #1
    targetPort: 8080        #1
  - name: https             #2
    port: 443               #2
    targetPort: 8443        #2
  selector:                 #3
    app: kubia              #3

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