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Island mode

As explained in Google Anthos in Action

Island mode is a cluster networking configuration in which workloads can communicate within a cluster but are isolated from external network access.

Island mode isolates a cluster’s Pod and Service addressing from external routing while preserving direct communication among workloads inside the cluster. This permits multiple clusters to reuse the same IP schema without address overlap or exhaustion. section 10.2.2 section 10.3.2

Account for these deployment implications:

  • Expose services externally through a load balancer, NodePort, and routable Service VIP; traffic is forwarded from the node to the target Pod. section 10.3.2
  • Connect services across clusters through their routable VIPs, even when the underlying Pod and Service addresses remain cluster-local. section 10.3.2
  • Use Ingress controllers when one externally reachable Ingress VIP must route to multiple services according to Ingress rules. section 10.3.2
  • Use Anthos Service Mesh for service discovery across clusters; hybrid and multicloud designs also require connectivity between infrastructure environments. section 10.3.2

Hybrid multicluster access

A service in one Anthos GKE cluster accesses a service in another cluster through the destination Service VIP. The load balancer routes that traffic to a NodePort, which forwards it to the destination Pod. section 10.3.2

Figure 10.15 Anthos GKE hybrid multicluster networking
10-15

Use the hybrid multicluster networking diagram to trace how routable VIPs connect services while cluster-internal addresses remain isolated. section 10.3.2

How Google Anthos in Action covers it

How deep it goes
Explains isolation, address reuse, load-balancer exposure, cross-cluster routing, Ingress, and service discovery.
Examples
Uses cross-cluster Service VIP routing, hybrid networking, Ingress VIPs, and Anthos Service Mesh diagrams.
What it assumes
Assumes familiarity with clusters, Pods, Services, load balancers, NodePort, and hybrid or multicloud infrastructure.
What you can do after
Operate multicluster services by exposing endpoints through load balancers and coordinating discovery across infrastructure environments.
How it connects
Links cluster networking with load balancers, NodePort, Service VIPs, Ingress, service discovery, and Anthos Service Mesh.
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