Ingress Rule route to multiple backend service ports.

[iacovosb]

Hello, and thank you for accepting my inquiry.

General information:

kubernetes version: v1.23.3
nginx-ingress vesion: (nginxinc/nginx-ingress OSS) v2.1.1 / nginx:1.21.5
Installation type: bare metal

I have the following service configuration:

apiVersion: v1
kind: Service
metadata:
  name: myservice
  namespace: testing
  labels:
    app: myservice
spec:
  ports:
  - name: http-5591
    port: 5591
    protocol: TCP
    targetPort: 5591 ## this is one of the ports the application is running
  - name: http-5592
    port: 5592
    protocol: TCP
    targetPort: 5592 ## this is another port the application is running

And the respective Ingress config:

ApiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myservice
  namespace: testing
  annotations:
    nginx.org/redirect-to-https: "True"
  tls:
  - hosts:
    - myservice.example.com
    secretName: wildcard-example-com
  rules:
  - host: myservice.example.com
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: myservice
            port:
             number: 5591
        backend:
          service:
            name: myservice
            port:
             number: 5592

What I am trying to do is Load Balance the requests to myservice.example.com to the same backend service, but by using multiple ports (5591 and 5592 in this example).
Please note that the requests I want to load balance are in the same path.

paths:
   - pathType: Prefix
     path: "/"

The generated config is:

        server 10.244.1.2:5592 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.11.10:5592 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.18.28:5592 max_fails=1 fail_timeout=10s max_conns=0;

Targeted config (what I am trying to achieve) is:

        server 10.244.1.2:5591 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.11.10:5591 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.18.28:5591 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.1.3:5592 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.11.13:5592 max_fails=1 fail_timeout=10s max_conns=0;
        server 10.244.18.38:5592 max_fails=1 fail_timeout=10s max_conns=0;`

I have tried several approaches, but I always seem to fall into a duplication of some sort.
Duplicate resource (for the host if I create multiple Ingress rules, duplicate location if I add both services under the same path, or ignoring the first part of the configuration if it is repeated in any way).

I also tried with VirtualServer:

apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: myservice-vs 
  namespace: testing
spec:
  host: myservice.example.com
  tls:
    secret: wildcard-example-com 
  upstreams:
  - name: myservice-stream
    service: myservice-5591
    port: 5591
    service: myservice-5592
    port: 5592
  routes:
  - path: /
    action:
      pass: myservice-stream

Again, one of the two services gets ignored:
Generated Config:

upstream vs_myservice {
    zone vs_myservice 256k;

    random two least_conn;
   
    server 10.244.1.3:5592 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.11.13:5592 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.18.38:5592 max_fails=1 fail_timeout=10s max_conns=0

Desired Config:

upstream vs_myservice {
    zone vs_myservice 256k;

    random two least_conn;
    server 10.244.1.2:5591 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.11.10:5591 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.18.28:5591 max_fails=1 fail_timeout=10s max_conns=0  
    server 10.244.1.3:5592 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.11.13:5592 max_fails=1 fail_timeout=10s max_conns=0;
    server 10.244.18.38:5592 max_fails=1 fail_timeout=10s max_conns=0

Is there any way I can achieve the desired configuration?
Thank you in advance

[brianehlert]

See #2493