terraform data google_compute_subnetwork attributes

example.tf

# use existing subnets and call theit attributes
data "google_compute_subnetwork" "k8s-us-west2" {
  name   = "k8s"
  region = "us-west2"
}

ip_allocation_policy = {
    cluster_ipv4_cidr_block = "${data.google_compute_subnetwork.k8s-us-west2.secondary_ip_range.0.range_name}",
    services_ipv4_cidr_block = "${data.google_compute_subnetwork.k8s-us-west2.secondary_ip_range.1.range_name}",
}

ip_allocation_policy = {
    cluster_ipv4_cidr_block = "${data.google_compute_subnetwork.k8s-us-west2.secondary_ip_range.0.ip_cidr_range}",
    services_ipv4_cidr_block = "${data.google_compute_subnetwork.k8s-us-west2.secondary_ip_range.1.ip_cidr_range}",
}