Traefik dashboard routing and authentication middleware configuration (repository: https://github.com/javaadpatel/Medium_Securing_Traefik_Dashboard)

traefik-dashboard-rule.yml

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: traefik-dashboard
spec:
  entryPoints:
    - web
    - websecure
  routes:
    - match: Host(`traefik.YOURDOMAIN.com`)
      kind: Rule
      services:
        - name: api@internal
          kind: TraefikService
      middlewares:
        - name: auth
  tls:
    certResolver: le
    domains:
      - main: YOURDOMAIN.com
        sans:
          - "*.YOURDOMAIN.com"

---
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: auth
spec:
  forwardAuth:
    address: https://traefikauth.YOURDOMAIN.com/_oauth
    trustForwardHeader: true
    authResponseHeaders:
      - X-Forwarded-User