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I want to expose some Helm Charts through Istio ingress.

For example, today I can expose Kubernetes Dashboard via Ingress type (with NginX Ingress):

helm install stable/kubernetes-dashboard --set ingress.enabled=true


However, for Istio would I have to fork the Kubernetes Dashboard Helm chart to add the required Gateway and VirtualService yaml?

Or is there a better way to patch opensource charts to work with Istio ingress?

You could create your own chart that includes the stable/kubernetes-dashboard as dependency in the requirements.yaml. Then you effectively have a wrapper chart that includes the dashboard and you can include the Istio ingress configuration at the wrapper level.

Actually you can do this without wrapping. In my case I had to expose Keycloak as VirtualService. Also keycloak was in other namespace.

1. I wrote Gateway
   


apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: keycloak-gateway
namespace: keycloak
spec:
selector:
istio: ingressgateway # use Istio default gateway implementation
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "*"


2. I wrote VirtualService
   


apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: demo-keycloak-http
namespace: keycloak
spec:
gateways:
- keycloak-gateway
hosts:
- '*'
http:
- match:
- uri:
prefix: /auth
route:
- destination:
host: demo-keycloak-http.keycloak.svc.cluster.local
port:
number: 80

Notice that I am routing the service name.
As you can see, it is possible to expose the helm chart from other namespace, in addition. In your case, maybe you will not need to have to write Gateway

You just need find the name of service and write for it VirtualService.