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* google_compute_backend_services use nested blocks to define backends (instance groups heterogeneous controllers) * Use Terraform v0.12.x dynamic blocks so the apiserver backend service can refer to (up to zone-many) controller instance groups * Previously, with Terraform v0.11.x, the apiserver backend service had to list a fixed set of backends to span controller nodes across zones in multi-controller setups. 3 backends were used because each GCP region offered at least 3 zones. Single-controller clusters had the cosmetic ugliness of unused instance groups * Allow controllers to span more than 3 zones if avilable in a region (e.g. currently only us-central1, with 4 zones) Related: * https://www.terraform.io/docs/providers/google/r/compute_backend_service.html * https://www.terraform.io/docs/configuration/expressions.html#dynamic-blocks
Typhoon 
Typhoon is a minimal and free Kubernetes distribution.
- Minimal, stable base Kubernetes distribution
- Declarative infrastructure and configuration
- Free (freedom and cost) and privacy-respecting
- Practical for labs, datacenters, and clouds
Typhoon distributes upstream Kubernetes, architectural conventions, and cluster addons, much like a GNU/Linux distribution provides the Linux kernel and userspace components.
Features 
- Kubernetes v1.15.0 (upstream, via kubernetes-incubator/bootkube)
- Single or multi-master, Calico or flannel networking
- On-cluster etcd with TLS, RBAC-enabled, network policy
- Advanced features like worker pools, preemptible workers, and snippets customization
- Ready for Ingress, Prometheus, Grafana, and other optional addons
Docs
Please see the official docs and the Google Cloud tutorial.