Exposing TCP and UDP services trough kubernetes ingress

ingress-haproxy.md

https://www.haproxy.com/documentation/kubernetes/latest/configuration/controller/#--configmap-tcp-services

Install HAProxy Kubernetes Ingress Controller:

helm repo add haproxytech https://haproxytech.github.io/helm-charts
helm repo update
helm install kubernetes-ingress haproxytech/kubernetes-ingress \
    --create-namespace \
    --namespace haproxy-controller

Create tcp-services ConfigMap that maps some port (e.g. 11587) to port 587 of connector-smtp service:

kubectl create configmap tcp-services -n haproxy-controller
kubectl patch configmap tcp-services -n haproxy-controller -p '{"data":{"11587":"my-namespace/connector-smtp:587"}}'

Edit ingress deployment (kubectl edit deployment.apps kubernetes-ingress -n haproxy-controller startup argument:

    spec:
      containers:
      - args:
        # ...
        - --configmap-tcp-services=haproxy-controller/tcp-services

Edit kubernetes-ingress service (kubectl edit svc kubernetes-ingress -n haproxy-controller) and add port is mapped in ConfigMap:

  ports:
    # ...
  - name: smtp
    protocol: TCP
    port: 11587
    targetPort: 11587

ingress-nginx.md

https://kubernetes.github.io/ingress-nginx/user-guide/exposing-tcp-udp-services/

Install nginx ingress controller:

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update
helm install nginx-ingress ingress-nginx/ingress-nginx

Create tcp-services ConfigMap that maps some port (e.g. 11587) to port 587 of connector-smtp service:

kubectl create configmap tcp-services
kubectl patch configmap tcp-services -p '{"data":{"11587":"my-namespace/connector-smtp:587"}}'

Edit ingress deployment (kubectl edit deploy nginx-ingress-ingress-nginx-controller) and add --tcp-services-configmap startup argument:

containers:
- args:
  - /nginx-ingress-controller
  # ...
  - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services

Edit ingress service (kubectl edit svc nginx-ingress-ingress-nginx-controller) and add port is mapped in ConfigMap:

  ports:
    # ...
  - name: smtp
    protocol: TCP
    port: 11587
    targetPort: 11587

my-ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
    name: my-ingress
    annotations:
        kubernetes.io/ingress.class: nginx
spec:
  rules:
    - http:
        paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: my-service
                port:
                  number: 587