ingress-nginx-helm/docs/examples/auth/oauth-external-auth/dashboard-ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/auth-url: "https://$host/oauth2/auth"
    nginx.ingress.kubernetes.io/auth-signin: "https://$host/oauth2/start?rd=$escaped_request_uri"
  name: external-auth-oauth2
  namespace: kube-system
spec:
  rules:
  - host: __INGRESS_HOST__
    http:
      paths:
      - backend:
          serviceName: kubernetes-dashboard
          servicePort: 80
        path: /

---

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: oauth2-proxy
  namespace: kube-system
spec:
  rules:
  - host: __INGRESS_HOST__
    http:
      paths:
      - backend:
          serviceName: oauth2-proxy
          servicePort: 4180
        path: /oauth2
  tls:
  - hosts:
    - __INGRESS_HOST__
    secretName: __INGRESS_SECRET__