Expose cluster name_servers as module output

[soulshake]

It would be useful to be able to retrieve cluster ingress nameservers programmatically, i.e. in cases where one wants to control the top-level zone while delegating authority to the cluster nameservers managing the base_domain defined in config.auto.tfvars.

Current behavior

Currently, to see the cluster ingress nameservers, one must do something like:

terraform state show module.eks_zero.module.cluster.aws_route53_zone.current[0]

Proposed behavior

The proposed change expresses the nameservers as outputs, allowing one to retrieve them programmatically, e.g. module.eks_zero.default_ingress_nameservers, in order to do things like:

resource "aws_route53_record" "cluster-ns" {
  zone_id         = aws_route53_zone.root.zone_id
  allow_overwrite = true
  name            = var.clusters.eks_zero.apps.base_domain
  type            = "NS"
  ttl             = "60"
  records         = module.eks_zero.default_ingress_nameservers   # <---
}

Or to define one's own Terraform output such as the following:

output "cluster_ns" { 
  value = module.eks_zero.default_ingress_nameservers
}

Outputs:

cluster_ns = [
  "ns-1141.awsdns-14.org",
  "ns-116.awsdns-14.com",
  "ns-1754.awsdns-27.co.uk",
  "ns-544.awsdns-04.net",
]

If this seems like an acceptable change, I can add similar outputs to the gke and azurerm providers.

Thoughts?

[pijemcolu]

The property module.cluster.default_ingress_nameservers doesn't exist in the repository. Shouldn't the output value rather be exposed through the internal _module to the external facing cluster output all the way to the user / code extending the cluster?

[pst]

Closing due to lack of activity.