Exposing a TCP port out of cluster in Kubernetes using nginx-Ingress

So, in order to achieve this you can do this:

1. First create the configMap that you added to the post.

apiVersion: v1kind: ConfigMapmetadata:  name: tcp-configmap-exampledata:  9000: "default/my-service-name:7051

2. Then edit your nginx-ingress-controller deployment by adding this flag to container args like below:

   ...containers:- name: nginx-ingress-controller  image: "quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.26.1"  imagePullPolicy: "IfNotPresent"  args:    - /nginx-ingress-controller    - --default-backend-service=nginx-ingress/nginx-ingress-default-backend    - --election-id=ingress-controller-leader    - --ingress-class=nginx    - --configmap=nginx-ingress/nginx-ingress-controller    - --tcp-services-configmap=default/tcp-configmap-example    ...

3. Edit LoadBalancer service by adding port to your LoadBalancer

   ...ports:- name: http  port: 80  protocol: TCP  targetPort: http- name: https  port: 443  protocol: TCP  targetPort: https- name: some-service-port  port: 7051  protocol: TCP

Hope it helps!

If you are installing with helm there is a way to expose tcp ports by setting values.

# add helm repohelm repo add ingress-nginx https://kubernetes.github.io/ingress-nginxhelm repo update

helm show values ingress-nginx/ingress-nginx will show the values.yaml file for reference, there are two dictionaries for exposing ports: tcp and udp:

# TCP service key:value pairs# Ref: https://github.com/kubernetes/ingress-nginx/blob/main/docs/user-guide/exposing-tcp-udp-services.md##tcp: {}#  8080: "default/example-tcp-svc:9000"# UDP service key:value pairs# Ref: https://github.com/kubernetes/ingress-nginx/blob/main/docs/user-guide/exposing-tcp-udp-services.md##udp: {}#  53: "kube-system/kube-dns:53"

To set the values from command line:

# set `tcp` dictionary in values (other `helm install` options omitted, only left options regarding to exposing tcp ports)helm install ingress-nginx ingress-nginx/ingress-nginx --set tcp.12345=some-namespace/some-service:80