Do I have to define an ingress per service with Linkerd? - kubernetes

Question

Looking at the linkerd ingress documentation here it says that I need to create an ingress with an annotation of
ingress.kubernetes.io/custom-request-headers: l5d-dst-override:web-svc.emojivoto.svc.cluster.local:80
this annotation is specific to a single service, which makes it sound like there must be a new ingress with it's own annotation for every service. I couldn't have something like the following for example:
spec:
rules:
- host: example.com
http:
paths:
- path: /path-one
backend:
serviceName: service-1
servicePort: 80
- path: /path-two
backend:
serviceName: service-2
servicePort: 80
where I could define paths to different services in a single ingress class.
Is my reading of these docs accurate? or am I missing something? I am hoping to avoid creating an ingress for every service I run in linkerd.

Answer 1

Yes, unfortunately you understood correctly about creating separate ingress for each service if you want use ingress.kubernetes.io/custom-request-headers.
Yes, if you would have 1000 services - you should create 1000 ingresses to make it work properly.
Ingress1:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: web-ingress
namespace: marcus
annotations:
kubernetes.io/ingress.class: "traefik"
ingress.kubernetes.io/custom-request-headers: l5d-dst-override:service1.marcus.svc.cluster.local:80
spec:
rules:
- host: example.com
http:
paths:
- backend:
serviceName: service1
servicePort: 80
path: /
Ingress2:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: web-ingress
namespace: marcus
annotations:
kubernetes.io/ingress.class: "traefik"
ingress.kubernetes.io/custom-request-headers: l5d-dst-override:service2.marcus.svc.cluster.local:80
spec:
rules:
- host: example.com
http:
paths:
- backend:
serviceName: service2
servicePort: 80
path: /

Answer 2

Traefik is a great solution, and in this case it would be great if it had the option to dynamically set the service in a header.
There is an open issue on this in the traefik project that has been open for a while. The last update is to use an Ingress per service in these scenarios.
Here's similar question.