I'm new to Istio. I've tried Istio multicluster configration on gke. I followed instruction at https://istio.io/docs/examples/multicluster/gke/ which says Istio control plane can connect to service "review-v3" at remote cluster but it couldn't. Istio control plane can connect to services at same cluster. How do you try to figure out the cause at first? Do you refer to the status of envoy? Or does anybody successfully get 2 clusters connected?
First of all, I would recommend you to make sure that the pre-requisites are met [1]
According to this similar issue [2], you must check the pilot logs which is the one in charge of the routing [3]. No, I won’t recommend Envoy Installation. I haven’t seen anyone connected two clusters together.
[1]https://istio.io/docs/setup/kubernetes/multicluster-install/
[2]https://github.com/istio/istio/issues/5534
[3]https://gist.github.com/tiswanso/47ddbd8f63a448a449c8609eefc64df0I had successful build istio multicluster on public cloud but not on GKE.
Cross cluster network was constructed by submariner. https://github.com/rancher/submariner
Then following the instruction begun with "Install the Istio control plane" in https://istio.io/docs/examples/multicluster/gke/.