103 lines
2.8 KiB
HCL
103 lines
2.8 KiB
HCL
# TCP Proxy load balancer DNS record
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resource "google_dns_record_set" "apiserver" {
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# DNS Zone name where record should be created
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managed_zone = var.dns_zone_name
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# DNS record
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name = format("%s.%s.", var.cluster_name, var.dns_zone)
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type = "A"
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ttl = 300
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# IPv4 address of apiserver TCP Proxy load balancer
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rrdatas = [google_compute_global_address.apiserver-ipv4.address]
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}
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# Static IPv4 address for the TCP Proxy Load Balancer
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resource "google_compute_global_address" "apiserver-ipv4" {
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name = "${var.cluster_name}-apiserver-ip"
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ip_version = "IPV4"
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}
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# Forward IPv4 TCP traffic to the TCP proxy load balancer
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resource "google_compute_global_forwarding_rule" "apiserver" {
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name = "${var.cluster_name}-apiserver"
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ip_address = google_compute_global_address.apiserver-ipv4.address
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ip_protocol = "TCP"
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port_range = "443"
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target = google_compute_target_tcp_proxy.apiserver.self_link
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}
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# Global TCP Proxy Load Balancer for apiservers
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resource "google_compute_target_tcp_proxy" "apiserver" {
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name = "${var.cluster_name}-apiserver"
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description = "Distribute TCP load across ${var.cluster_name} controllers"
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backend_service = google_compute_backend_service.apiserver.self_link
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}
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# Global backend service backed by unmanaged instance groups
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resource "google_compute_backend_service" "apiserver" {
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name = "${var.cluster_name}-apiserver"
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description = "${var.cluster_name} apiserver service"
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protocol = "TCP"
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port_name = "apiserver"
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session_affinity = "NONE"
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timeout_sec = "300"
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# controller(s) spread across zonal instance groups
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backend {
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group = google_compute_instance_group.controllers[0].self_link
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}
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backend {
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group = google_compute_instance_group.controllers[1].self_link
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}
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backend {
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group = google_compute_instance_group.controllers[2].self_link
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}
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health_checks = [google_compute_health_check.apiserver.self_link]
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}
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# Instance group of heterogeneous (unmanged) controller instances
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resource "google_compute_instance_group" "controllers" {
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count = length(local.zones)
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name = format(
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"%s-controllers-%s",
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var.cluster_name,
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element(local.zones, count.index),
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)
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zone = element(local.zones, count.index)
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named_port {
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name = "apiserver"
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port = "443"
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}
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# add instances in the zone into the instance group
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instances = matchkeys(
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google_compute_instance.controllers.*.self_link,
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google_compute_instance.controllers.*.zone,
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[element(local.zones, count.index)],
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)
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}
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# TCP health check for apiserver
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resource "google_compute_health_check" "apiserver" {
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name = "${var.cluster_name}-apiserver-tcp-health"
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description = "TCP health check for kube-apiserver"
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timeout_sec = 5
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check_interval_sec = 5
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healthy_threshold = 1
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unhealthy_threshold = 3
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tcp_health_check {
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port = "443"
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}
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}
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