UnknownDestinationRuleHost

This message occurs when the host of a DestinationRule does not match a service in the mesh. The service can be a Kubernetes Service or a host in a ServiceEntry.

An example

Consider this DestinationRule, when there is no reveiws service:

apiVersion: networking.istio.io/v1
kind: DestinationRule
metadata:
  name: reviews
spec:
  host: reveiws

You will receive this message:

Warning [IST0174] (DestinationRule default/reviews) The host reveiws defined in the DestinationRule does not match any services in the mesh.

How to resolve

• Make sure that the host is spelled correctly.
• If the service is in a different namespace, use the fully qualified name of the host, for example reviews.bookinfo.svc.cluster.local.
• Make sure that the exportTo field of the service makes it visible to the namespace of the DestinationRule.
• If the host is outside the mesh, create a ServiceEntry for it.