ingress-nginx/controllers/nginx/examples/udp/README.md

To configure which services and ports will be exposed

kubectl create -f udp-configmap-example.yaml

The file udp-configmap-example.yaml uses a ConfigMap where the key is the external port to use and the value is <namespace/service name>:<service port> It is possible to use a number or the name of the port.

kubectl create -f rc-udp.yaml