Ingress rewrite to two different services from one DNS - nginx

Question

I am trying to reach out to two services from my DNS.
Example:- myportal.com
myportal.com/app1
I have my SSO and SSL implementation on "myportal.com" and on the home page I have a button which calls a service "myportal.com/app1". I have tried multiple things but I am not able to configure both properly.
From below ingress config I am able to redirect to "myportal.com/app1" but its not working properly for "myportal.com". I have tried multiple thing including default backend and its not working for me. When I use default backend then "myportal.com" works but it stops redirecting to /app1.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: myportal-ingress-test
namespace: appspace
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
nginx.ingress.kubernetes.io/use-regex: "true"
spec:
ingressClassName: nginx
tls:
- hosts:
- myportal.com
secretName: secret
rules:
- host: myportal.com
http:
paths:
- pathType: Prefix
path: /
backend:
service:
name: portal-service
port:
number: 8097
- pathType: Prefix
path: /app1(/|$)(.*)
backend:
service:
name: app-ui-service
port:
number: 8087
I am fairly new to kubernetes and I am not sure if it's the correct way to implement such things. I am open to new implementation too if it's using ingress and routing to different services using same dns on different path.
Thanks in advance for the help!

Answer 1

I was able to resolve this issue. The redirect in an ingress file would work for all the paths, so I created a separate ingress for each path with individual redirects.
Ingress 1 - myportal.com (with SSO and SSL)
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: gcpportal-service-test
namespace: appspace
annotations:
nginx.ingress.kubernetes.io/x-forwarded-prefix: /myportal-service
nginx.ingress.kubernetes.io/ssl-redirect: 'true'
spec:
ingressClassName: nginx
tls:
- hosts:
- myportal.com
secretName: secret
defaultBackend:
service:
name: myportal-service
port:
number: 80
rules:
- host: myportal.com
Ingress 2 - myportal.com/app1 (application deployed)
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: gcpportal-service-test-1
namespace: appspace
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
nginx.ingress.kubernetes.io/use-regex: "true"
spec:
ingressClassName: nginx
tls:
- hosts:
- myportal.com
secretName: secret
rules:
- host: myportal.com
- pathType: Prefix
path: /app1(/|$)(.*)
backend:
service:
name: app1-ui-service
port:
number: 8087
This helped me to resolve this issue. I also verified that this way is also a standard way and is provided in one of the documentation of nginx.
https://kubernetes.github.io/ingress-nginx/user-guide/ingress-path-matching/