Ingress to redirect to service from LB ip - kubernetes

Question

I'm trying to create an Ingress rule to redirect requests from LoadBalancer to Service.
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: hostlessendpoint
spec:
rules:
- http:
paths:
- path: /hostless
backend:
serviceName: node-red
servicePort: 1880
The above yaml script is supposed to redirect all requests from https://LOAD_BALANCER_IP/hostless to node-red on port 1880
If I try to request the above URL, I got an error Cannot GET /hostless. Requesting the root gives 404 page not found.
I can access my services with the direct URL (eg. http://LOAD_BALANCER_IP:1880 will redirect to Node-red service).
Service yaml looks like that:
apiVersion: v1
kind: Service
metadata:
labels:
app: node-red
name: node-red
spec:
ports:
- name: "1880"
port: 1880
protocol: TCP
targetPort: 1880
selector:
app: node-red
sessionAffinity: None
type: LoadBalancer
How to use ingress to reach a service whereas a custom port ?

Answer 1

I've found a way to make it works !
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
cert-manager.io/cluster-issuer: letsencrypt-prod
traefik.ingress.kubernetes.io/redirect-entry-point: https
kubernetes.io/ingress.class: "traefik"
traefik.ingress.kubernetes.io/router.middlewares: "kube-system-traefik-stripprefix#kubernetescrd"
name: traefik-all
namespace: partner
spec:
rules:
- http:
paths:
- path: /
backend:
serviceName: nginx-demo
servicePort: 2222
- path: /node
backend:
serviceName: node-red
servicePort: 1880
---
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: traefik-stripprefix
namespace: kube-system
spec:
stripPrefixRegex:
regex:
- "/[^/]+"
I use a middleware to remove the prefix as K3S Traefik does not support the traefik.ingress.kubernetes.io/rewrite-target annotation.
With the above code, all trafic from LOAD_BALANCER_IP/* will be redirected to nginx-demo:2222 service. All trafic from LOAD_BALANCER_IP/node/* will be redicted to node-red:1880 service.
I hope this could help someone !

Answer 2

Try setting a rewrite-target annotation, which will effectively rewrite /hostless requests to /, i.e. http://LOAD_BALANCER_IP:1880/hostless externally to http://node-red:1880 internally.
For example:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
name: hostlessendpoint
spec:
rules:
- http:
paths:
- path: /hostless(/|$)(.*)
backend:
serviceName: node-red
servicePort: 1880
See this link, assuming you are using Nginx ingress controller.