92 lines
2.8 KiB
HCL
92 lines
2.8 KiB
HCL
# Discrete DNS records for each controller's private IPv4 for etcd usage
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resource "google_dns_record_set" "etcds" {
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count = "${var.controller_count}"
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# DNS Zone name where record should be created
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managed_zone = "${var.dns_zone_name}"
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# DNS record
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name = "${format("%s-etcd%d.%s.", var.cluster_name, count.index, var.dns_zone)}"
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type = "A"
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ttl = 300
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# private IPv4 address for etcd
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rrdatas = ["${element(google_compute_instance.controllers.*.network_interface.0.address, count.index)}"]
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}
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# Zones in the region
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data "google_compute_zones" "all" {
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region = "${var.region}"
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}
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locals {
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# TCP proxy load balancers require a fixed number of zonal backends. Spread
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# controllers over up to 3 zones, since all GCP regions have at least 3.
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zones = "${slice(data.google_compute_zones.all.names, 0, 3)}"
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controllers_ipv4_public = ["${google_compute_instance.controllers.*.network_interface.0.access_config.0.assigned_nat_ip}"]
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}
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# Controller instances
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resource "google_compute_instance" "controllers" {
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count = "${var.controller_count}"
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name = "${var.cluster_name}-controller-${count.index}"
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zone = "${element(local.zones, count.index)}"
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machine_type = "${var.controller_type}"
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metadata {
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user-data = "${element(data.template_file.controller-cloudinit.*.rendered, count.index)}"
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}
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boot_disk {
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auto_delete = true
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initialize_params {
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image = "${var.os_image}"
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size = "${var.disk_size}"
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}
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}
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network_interface {
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network = "${google_compute_network.network.name}"
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# Ephemeral external IP
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access_config = {}
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}
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can_ip_forward = true
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tags = ["${var.cluster_name}-controller"]
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}
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# Controller Cloud-Init
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data "template_file" "controller-cloudinit" {
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count = "${var.controller_count}"
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template = "${file("${path.module}/cloudinit/controller.yaml.tmpl")}"
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vars = {
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# Cannot use cyclic dependencies on controllers or their DNS records
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etcd_name = "etcd${count.index}"
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etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
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# etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
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etcd_initial_cluster = "${join(",", formatlist("%s=https://%s:2380", null_resource.repeat.*.triggers.name, null_resource.repeat.*.triggers.domain))}"
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kubeconfig = "${indent(6, module.bootkube.kubeconfig)}"
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ssh_authorized_key = "${var.ssh_authorized_key}"
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k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
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cluster_domain_suffix = "${var.cluster_domain_suffix}"
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}
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}
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# Horrible hack to generate a Terraform list of a desired length without dependencies.
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# Ideal ${repeat("etcd", 3) -> ["etcd", "etcd", "etcd"]}
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resource null_resource "repeat" {
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count = "${var.controller_count}"
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triggers {
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name = "etcd${count.index}"
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domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
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}
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}
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