Deploying .Net Core WebApi Docker Image to Azure Kubernetes Service using Nginx Ingress Controller - nginx

Question

I have created a sample .Net Core WebApi and pushed the images to ACR. Now I am deploying it to AKS with Nginx Ingress Controller using Ingress Resources pointing to ClusterIP Service that points to Deployed Pods running the image.
Issue is when I change ClusterIP service to LoadBalancer to hit it directly for testing, I get the results from WebApi. But when I change it back to ClusterIP and hit using Nginx Ingress Controller IP address, I always get 404 Not Found.
Below is the code. Please suggest.
apiVersion: apps/v1
kind: Deployment
metadata:
name: weather-forecast-webapi-deployment
namespace: development
spec:
replicas: 1
selector:
matchLabels:
app: weather-forecast-webapi-pod
template:
metadata:
labels:
app: weather-forecast-webapi-pod
spec:
containers:
- name: weather-forecast-webapi-container
image: employeeconnectacr.azurecr.io/demoapi:latest
ports:
- containerPort: 80
apiVersion: v1
kind: Service
metadata:
name: weather-forecast-webapi-service-clusterip
namespace: development
spec:
ports:
- port: 80
targetPort: 80
selector:
app: weather-forecast-webapi-pod
kind: Ingress
apiVersion: networking.k8s.io/v1beta1
metadata:
name: econnect-ingress
namespace: development
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /$1
nginx.ingress.kubernetes.io/ssl-redirect: 'false'
nginx.ingress.kubernetes.io/use-regex: 'true'
spec:
rules:
- http:
paths:
- path: /demo
pathType: Prefix
backend:
serviceName: weather-forecast-webapi-service-clusterip
servicePort: 80
status:
loadBalancer:
ingress:
- ip: 52.141.219.175

Answer 1

Looks like you messed up your ingress object. I assume you want to rewrite the /demo path to / so that paths like: /demo/foo/bar are rewritten to /foo/bar.
Here is the rewrite explained.
Here is the example:
kind: Ingress
apiVersion: networking.k8s.io/v1beta1
metadata:
name: econnect-ingress
namespace: development
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /$2
nginx.ingress.kubernetes.io/ssl-redirect: 'false'
spec:
rules:
- http:
paths:
- path: /demo(/|$)(.*)
pathType: Prefix
backend:
serviceName: weather-forecast-webapi-service-clusterip
servicePort: 80
Notice that all I changed is path and rewtire-tager group number. In /demo(/|$)(.*) the brackets () create a group that is referenced in rewrite-target: /$2. The $1 is referencing the first group: / or end of string, and the second group is everything after it; so you copy everything after the /demo/ and make it a new path.