An Ingress backend must target Service payments on port 8080, while…

Question

An Ingress backend must target Service payments on port 8080, while Pods listen on containerPort 8080 mapped from Service port 80 via targetPort. Which port should the Ingress backend reference?

Accepted Answer

The Service port (80 or the Service port name), not the Pod IP and not a guess at containerPort alone. — Ingress talks to Services, not raw container ports by imagination. Put the Service’s port (number or name) in the backend. targetPort is the Service-to-Pod hop that already happened behind the scenes.

Answer

The node’s hostPort value only, ignoring the Service.

Answer

Any random high port because Ingress bypasses Services and dials kubelet directly.

Answer

The etcd client port so the controller can read Endpoints from disk.

An Ingress backend must target Service payments on port 8080, while Pods listen on containerPort 8080 mapped from Service port 80 via targetPort. Which port should the Ingress backend reference?

Short Explanation

Full Explanation