IngressRouteRulesNotAffected

This message occurs when a VirtualService that is bound to a gateway sends traffic to a host without a subset, and a different VirtualService uses subsets to route traffic to the same host.

A gateway only uses the VirtualService resources that are bound to it. Thus, the subset rules in the other VirtualService have no effect on requests that come through the gateway.

An example

Consider these two VirtualService resources:

apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: reviews
spec:
  hosts:
  - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
---
apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: reviews-ingress
spec:
  hosts:
  - "reviews.example.com"
  gateways:
  - reviews-gateway
  http:
  - route:
    - destination:
        host: reviews

Requests that come through reviews-gateway go to all versions of reviews, not only to v1. You will receive this message:

Warning [IST0140] (VirtualService default/reviews-ingress) Subset in virtual service default/reviews has no effect on ingress gateway default/reviews-ingress requests

How to resolve

Do one of these:

• Add the subset to the route in the VirtualService that is bound to the gateway.
• Add the gateway to the gateways field of the VirtualService that has the subset rules.