Expose basepath in container through service in nginx ingress on kubernetes - docker

Question

My ASP.NET Core web application uses basepath in startup like,
app.UsePathBase("/app1");
So the application will run on basepath. For example if the application is running on localhost:5000, then the app1 will be accessible on 'localhost:5000/app1'.
So in nginx ingress or any ingress we can expose the entire container through service to outside of the kubernetes cluster.
My kubernetes deployment YAML file looks like below,
apiVersion: apps/v1
kind: Deployment
metadata:
name: app1-deployment
spec:
selector:
matchLabels:
app: app1
replicas: 1
template:
metadata:
labels:
app: app1
spec:
containers:
- name: app1-container
image: app1:latest
ports:
- containerPort: 5001
---
apiVersion: v1
kind: Service
metadata:
name: app1-service
labels:
app: app1
spec:
type: NodePort
ports:
- name: app1-port
port: 5001
targetPort: 5001
protocol: TCP
selector:
app: app1
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: app1-ingress
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- http:
paths:
- path: /app1(/|$)(.*)
backend:
serviceName: server-service
servicePort: 5001
The above ingress will expose the entire container in 'localhost/app1' URL. So the application will run on '/app1' virtual path. But the app1 application will be accessible on 'localhost/app1/app1'.
So I want to know if there is any way to route 'localhost/app1' request to basepath in container application 'localhost:5001/app1' in ingress.

Answer 1

If I understand correctly, now the app is accessible on /app1/app1 and you would like it to be accessible on /app1
To do this, don't use rewrite:
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: app1-ingress
annotations:
kubernetes.io/ingress.class: nginx
spec:
rules:
- http:
paths:
- path: /app1
backend:
serviceName: server-service
servicePort: 5001