typhoon/google-cloud/flatcar-linux/kubernetes/controllers.tf

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# Discrete DNS records for each controller's private IPv4 for etcd usage
resource "google_dns_record_set" "etcds" {
count = var.controller_count
# DNS Zone name where record should be created
managed_zone = var.dns_zone_name
# DNS record
name = format("%s-etcd%d.%s.", var.cluster_name, count.index, var.dns_zone)
type = "A"
ttl = 300
# private IPv4 address for etcd
rrdatas = [google_compute_instance.controllers.*.network_interface.0.network_ip[count.index]]
}
# Zones in the region
data "google_compute_zones" "all" {
region = var.region
}
locals {
zones = data.google_compute_zones.all.names
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controllers_ipv4_public = google_compute_instance.controllers.*.network_interface.0.access_config.0.nat_ip
}
# Controller instances
resource "google_compute_instance" "controllers" {
count = var.controller_count
name = "${var.cluster_name}-controller-${count.index}"
# use a zone in the region and wrap around (e.g. controllers > zones)
zone = element(local.zones, count.index)
machine_type = var.controller_type
metadata = {
user-data = data.ct_config.controllers.*.rendered[count.index]
}
boot_disk {
auto_delete = true
initialize_params {
image = data.google_compute_image.flatcar-linux.self_link
size = var.disk_size
}
}
network_interface {
network = google_compute_network.network.name
# Ephemeral external IP
access_config {
}
}
can_ip_forward = true
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tags = ["${var.cluster_name}-controller"]
lifecycle {
ignore_changes = [
metadata,
boot_disk[0].initialize_params
]
}
}
# Flatcar Linux controllers
data "ct_config" "controllers" {
count = var.controller_count
content = templatefile("${path.module}/butane/controller.yaml", {
# Cannot use cyclic dependencies on controllers or their DNS records
etcd_name = "etcd${count.index}"
etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
# etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
etcd_initial_cluster = join(",", [
for i in range(var.controller_count) : "etcd${i}=https://${var.cluster_name}-etcd${i}.${var.dns_zone}:2380"
])
kubeconfig = indent(10, module.bootstrap.kubeconfig-kubelet)
ssh_authorized_key = var.ssh_authorized_key
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
cluster_domain_suffix = var.cluster_domain_suffix
})
strict = true
snippets = var.controller_snippets
}