Which formats does Kiali support for specifying hosts?
Istio highly recommends that you always use fully qualified domain names (FQDN) for hosts in DestinationRules. However, Istio does allow you to use other formats like short names (details or details.bookinfo). Kiali only supports FQDN and simple service names as host formats: for example details.bookinfo.svc.cluster.local or details. Validations using the details.bookinfo format might not be accurate.
In the following example it should show the validation of "More than one Destination Rule for the same host subset combination". Because of the usage of the short name reviews.bookinfo Kiali won’t show the warning message on both destination rules.
apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews-dr1 namespace: bookinfo spec: host: reviews subsets: - name: v1 labels: version: v1 - name: v2 labels: version: v2 --- apiVersion: networking.istio.io/v1alpha3 kind: DestinationRule metadata: name: reviews-dr2 namespace: bookinfo spec: host: reviews.bookinfo trafficPolicy: loadBalancer: simple: RANDOM subsets: - name: v1 labels: version: v1
See the recomendation Istio gives regarding host format: "To avoid potential misconfigurations, it is recommended to always use fully qualified domain names over short names."
For best results with Kiali, you should use fully qualified domain names when specifying hosts.