Why host merging is not supported in sidecars

[zhongfox]

https://istio.io/docs/ops/traffic-management/deploy-guidelines/#multiple-virtual-services-and-destination-rules-for-the-same-host

「A VirtualService can only be fragmented this way if it is bound to a gateway. Host merging is not supported in sidecars.」

Im wonder why the merging is not supported in sidecars? it’s nice feature.

I tried, for sidecars, multiple VirtualService for one host, seems only the first VirtualService is used.

[erSitzt]

As i just stumbled across this “problem” myself… and there is still no satisfying answer…

How did you work around that limitation ?

Similiar post here

VirtualService host merging unavailability in sidecars

A little late, but i’m having problems with that too… I think it means as long as multiple VirtualService use the same host entry, they will not merge in the sidecar, but the last one will overwrite the others and remain the only active VirtualService. Did you solve your problem ? I feel this is a pretty standard use case, because we have to have the same service running in different versions in our backend like this https://sameservice.domain.com/v1 https://sameservice.domain.com/v2 https…

[erSitzt]

If anyone is interested in this feature, i opened an issue / feature request here

Merging of split VirtualServices using the mesh gateway (sidecars)