domain registry with Istio ServiceEntry - kubernetes

Question

Now I am testing the scenario running apps on Istio.
I cant access to legacy codes, so I cant change request urls.
For that, I made some simple apps.
I am not sure this scenario is available on Istio.
I have two applications(order and customer)
On the order app, there is code calling customer app with url "http://customer-app:8080/customer".
Now, I want to run two apps on K8S with Istio.
And I don't want to change my code especially calling urls.
(I know I can call each service with service-name.
but I want to make customer service name with "customer-service" not "customer-app")
I find there is a VirtualService which can register MESH_INTERNAL.
I make yaml file like that.
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
name: customer-service-entry
spec:
hosts:
- http://customer-app:8080
location: MESH_INTERNAL
ports:
- number: 8080
name: http
protocol: http
endpoints:
- address: customer-service
ports:
http: 8080
is it possible scenario using virtual domain?

Answer 1

You should be able to do this using a VirtualService:
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: customer-app
spec:
hosts:
- customer-app
http:
- match:
- port: 8080
route:
- destination:
host: customer-service
port:
number: 9080
You will also need to define a dummy K8S service for customer-app, so that it's resolvable:
apiVersion: v1
kind: Service
metadata:
name: customer-app
spec:
ports:
- port: 8080
name: http