This message occurs when a virtual service contains a match rule that will never be used because a previous rule specifies the same match.
You will receive this message:
Info [IST0131] (VirtualService tls-routing.default) VirtualService rule #1 match #0 is not used (duplicates a match in rule #0).
when your cluster has the following virtual service:
apiVersion: networking.istio.io/v1alpha3 kind: VirtualService metadata: name: tls-routing spec: hosts: - www1.googleapis.com - api1.facebook.com tls: - match: - port: 2443 sniHosts: - www1.googleapis.com route: - destination: host: www1.googleapis.com - match: - port: 2443 sniHosts: - www1.googleapis.com route: - destination: host: api1.facebook.com
In this example, the virtual service specifies two different destinations for the same match. Istio will use the first match, and never send traffic to the second destination.
How to resolve
If you need traffic to go to more than one place, use
Re-order your routes so that the most specific ones are first. Place ‘catch all’ routes at the end.