How to write a custom ingressgateway in istio? - kubernetes

Question

I'm new to istio, I have a simple test yaml file which is a little long. What I want to do is to write a custom ingressgateway service for my gateway. And after testing, the incorrect part is the definition of ingressgateway which is at the top. The entire yaml is below:
apiVersion: v1
kind: Service
metadata:
name: batman-ingressgateway
labels:
app: batman-ingressgateway
spec:
type: LoadBalancer
selector:
app: batman-ingressgateway
ports:
- port: 80
targetPort: 80
nodePort: 31389
name: http
---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: batman-gateway
spec:
selector:
app: batman-ingressgateway
#istio: ingressgateway
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "*"
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: batman
spec:
hosts:
- "*"
gateways:
- batman-gateway
http:
- match:
route:
- destination:
host: batman
port:
number: 8000
subset: v1
weight: 80
- destination:
host: batman
port:
number: 8000
subset: v2
weight: 20
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: batman-destination
spec:
host: batman
subsets:
- name: v1
labels:
version: v1
run: batman
- name: v2
labels:
version: v2
run: batman
I want to access my app from browser with the address like: http://my_host_ip:31389/article. The problem now is the ingressgateway doesn't route traffic to my gateway. Is there any one can help me?
Thanks.

Answer 1

Documentation on istio gateway routing is here https://istio.io/docs/tasks/traffic-management/ingress/ingress-control/.
If you look at gateway spec they have
selector:
istio: ingressgateway # use Istio default gateway implementation
While you have
selector:
app: batman-ingressgateway
#istio: ingressgateway
For VirtualService definition you can look here https://istio.io/docs/reference/config/networking/v1alpha3/virtual-service/
You can try with routing requests to /article to your service
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: article-route
spec:
hosts:
- *
http:
- match:
- uri:
prefix: "/article"
route:
- destination:
host: <name of your service>