Kubernetes - Discover and access another cluster service like self-hosted

Question

What I want

• ClusterA have PodA
• ClusterB have ServiceB select PodB in namespace:default
• In GKE(Google Kubernetes Engine)

PodA in ClusterA can access ServiceB in clusterB like api.default.svc.cluster.clusterB.

Solutions I tried

• GKE Internal Load Balancer: https://cloud.google.com/kubernetes-engine/docs/how-to/internal-load-balancing
  • It works. But I need to create a lot of ILB for each one of services.
• https://stackoverflow.com/a/31665248/3854890
  • I don't think manually configure kube-proxy is a good choice since I'm using preemptible VMs.
• Kubefed: https://github.com/kubernetes-sigs/kubefed
  • I didn't dig it too deep. It's like manipulate multiple cluster and expose them. And what I what it communicates internally.
• Maesh https://containo.us/maesh/
  • Didn't see cross cluster configurations.
• Istio https://istio.io/latest/blog/2020/multi-cluster-mesh-automation/
  • A little complicated to me. Not sure it suit to this scenario.

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Any solutions or ideas are appreciated! A example will be better.

Answer 1

I found three solutions for this. For multi-cluster kubernetes architecture.

• Linkerd: https://linkerd.io/2/features/multicluster/index.html
• Consule: https://learn.hashicorp.com/consul/kubernetes/mesh-gateways
• Istio: https://istio.io/latest/docs/setup/install/multicluster/shared/

I chose Linkerd. Pretty easy to setup, good latency and good documents.

I also wrote an article in Chinese if someone interested. https://rammusxu.github.io/2020/07/28/Linkerd-Multi-Kubernetes-Cluster-Feature-Overview/