通过 Kubernetes 上的 nginx 入口中的服务公开容器中的基本路径

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