I am trying to use terraform to create a GKE cluster, but I am stuck because, for the pod / services subnetworks, I do not know which values GKE uses by default for the primary IP range and secondary IP range.

In the below terraform configuration, what are the default GKE values for:

google_compute_subnetwork.pods.ip_range
google_compute_subnetwork.pods.secondary_ip_range.ip_range
google_compute_subnetwork.services.ip_range
google_compute_subnetwork.services.secondary_ip_range.ip_range

?

resource "google_compute_network" "primary" {
    name                    = "${var.cluster_name}"
    auto_create_subnetworks = false
}

resource "google_compute_subnetwork" "pods" {
    name          = "pods-primary"
    region        = "${var.region}"
    ip_cidr_range = ""
    network       = "${google_compute_network.primary.self_link}"

    secondary_ip_range {
        range_name    = "pods-secondary"
        ip_cidr_range = ""
    }
}

resource "google_compute_subnetwork" "services" {
    name          = "services-primary"
    region        = "${var.region}"
    ip_cidr_range = ""
    network       = "${google_compute_network.primary.self_link}"

    secondary_ip_range {
        range_name    = "services-secondary"
        ip_cidr_range = ""
    }
}