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Improve apiserver backend service zone spanning

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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
This commit is contained in:
Dalton Hubble
2019-07-05 19:21:05 -07:00
parent 8d373b5850
commit 3fcb04f68c
3 changed files with 12 additions and 18 deletions
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@ -6,6 +6,11 @@ Notable changes between versions.
* Update Calico from v3.7.3 to [v3.7.4](https://docs.projectcalico.org/v3.7/release-notes/)
#### Google Cloud
* Allow controller nodes to span more than 3 zones if available in a region ([#504](https://github.com/poseidon/typhoon/pull/504))
* Eliminate extraneous controller instance groups in single-controller clusters ([#504](https://github.com/poseidon/typhoon/pull/504))
#### Addons
* Update Grafana from v6.2.4 to v6.2.5