Exposing TCP and UDP services in Kubernetes using nginx-ingress

Nginx-ingress provides us with the capability to manage HTTP/HTTPS traffic for multiple services. But ingress doesn’t support TCP or UDP services. But there is a workaround, using nginx-ingress we can use the args --tcp-services-configmap and --udp-services-configmap to map an exposed (external world) port to a corresponding Kubernetes service using a configmap.

https://devopscube.com/setup-ingress-kubernetes-nginx-controller/

Deploying nginx-ingress using deployment:

In nginx-ingress Deployment manifest, use the argument --tcp-services-configmap

Sample deployment for nginx-ingress with args

The corresponding configmap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: tcp-services
  namespace: default
data:
  27017: "default/tcp-svc:27017"

Deploying nginx-ingress using helm charts:

apiVersion: flux.weave.works/v1beta1
kind: HelmRelease
metadata:
  name: nginx-ingress
  namespace: default
spec:
  releaseName: nginx-ingress
  chart:
    repository: https://kubernetes-charts.storage.googleapis.com 
    name: nginx-ingress
    version: 1.6.10
  values:
    tcp:
      27017: "default/tcp-svc:27017"