We can manage multi k8s cluster with federation now, but if services distributed in different cluster need to communication with each other, are there any network mechanism we can use?
1) ingress could work, but it's suitable for outside application to connect into federation cluster.
2) services in different k8s cluster , can still using container network and service network (provided by k8s) to communicate to each other? [it seems cannot ...., I am not sure..].