nginx-forwarder.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-forwarder-conf
data:
  nginx.conf: |
    events {
       worker_connections  512;
    }

    stream {
        server {
            listen 80;
            proxy_pass service_to_forward:80;
   
        }
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-forwarder
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx-forwarder
  template:
    metadata:
      labels:
        app: nginx-forwarder
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /etc/nginx # mount nginx-conf volumn to /etc/nginx
          readOnly: true
          name: nginx-forwarder-conf
      - name: tailscale
        image: exorath/tailscale
        securityContext:
          capabilities:
            add:
              - NET_ADMIN
      volumes:
      - name: nginx-forwarder-conf
        configMap:
          name: nginx-forwarder-conf # place ConfigMap `nginx-conf` on /etc/nginx
          items:
            - key: nginx.conf
              path: nginx.conf