Forward to ExternalName with traefik in kubernetes as the documenation suggests - kubernetes

Question

Following the Official Guide I got to the section onForwarding to ExtternalNames. Where it says:
When specifying an ExternalName, Træfik will forward requests to the given host accordingly
which points to the docs from kubernetes services without selectors
Which led me to create a service
kind: Service
apiVersion: v1
metadata:
name: my-service
namespace: prod
spec:
type: ExternalName
externalName: my.database.example.com
Of which Traefik happily ignores when I point to it:
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-service
namespace: kube-system
spec:
rules:
- host: my-service.example.com
http:
paths:
- path: /
backend:
serviceName: my-service
servicePort: 4080
I have also tried as an endpoint.
---
kind: Service
apiVersion: v1
metadata:
name: my-service
namespace: kube-system
spec:
ports:
- protocol: TCP
port: 80
targetPort: 4080
---
kind: Endpoints
apiVersion: v1
metadata:
name: my-service
subsets:
- addresses:
- ip: 10.0.0.3
ports:
- port: 4080
Does anyone know how to get traefik to point to an externalname as the documentation suggests?

Answer 1

As I see, you missed at least one line in your Ingress object - traefik.frontend.passHostHeader: "false".
Also, you need to create an Ingress object in a same Namespace with your Service.
So, your Ingress should be like:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-service
namespace: prod
annotations:
traefik.frontend.passHostHeader: "false"
spec:
rules:
- host: my-service.example.com
http:
paths:
- path: /
backend:
serviceName: my-service
servicePort: 4080
And service:
kind: Service
apiVersion: v1
metadata:
name: my-service
namespace: prod
spec:
type: ExternalName
ports:
- name: app-port
port: 4080
externalName: my.database.example.com