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by puzzle
3012 days ago
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Running a Kubernetes cluster across multiple regions is not a great idea. You can set up a federation of clusters, but GKE doesn't seem to support that yet, so you need to create and manage the federated control plane yourself. And there's no standard way at the moment to have generic cross-cluster networking, like you easily could with Borg. So you can load balance external requests to a number of clusters, as you explain, but currently it's easier if each cluster is self-sufficient and doesn't need to refer to internal services in other clusters. |
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GKE doesn't support federation because it's not a final feature either, it was beta at best and is now being revised and renamed to "multi-cluster": https://github.com/kubernetes/community/tree/master/sig-mult...
If you need to reach services between clusters, that's completely different from ingress. Ingress is about external access to cluster services.
You can still use an authentication layer and expose everything through an ingress, or use internal IPs for the services/containers which are already routable in GCP's network across regions. A headless service to get the IPs and a cron job to sync these to a public DNS system will give you the same thing federation does for cross-cluster service discovery. There are also apps like ExternalDNS that'll do it for you: https://github.com/kubernetes-incubator/external-dns