typhoon/google-cloud/container-linux/kubernetes/workers/workers.tf

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# Regional managed instance group maintains a homogeneous set of workers that
# span the zones in the region.
resource "google_compute_region_instance_group_manager" "workers" {
name = "${var.cluster_name}-worker-group"
description = "Compute instance group of ${var.cluster_name} workers"
# instance name prefix for instances in the group
base_instance_name = "${var.cluster_name}-worker"
instance_template = "${google_compute_instance_template.worker.self_link}"
region = "${var.region}"
target_size = "${var.count}"
# target pool to which instances in the group should be added
target_pools = [
"${google_compute_target_pool.workers.self_link}",
]
}
# Worker Container Linux Config
data "template_file" "worker_config" {
template = "${file("${path.module}/cl/worker.yaml.tmpl")}"
vars = {
k8s_dns_service_ip = "${cidrhost(var.service_cidr, 10)}"
k8s_etcd_service_ip = "${cidrhost(var.service_cidr, 15)}"
ssh_authorized_key = "${var.ssh_authorized_key}"
kubeconfig_ca_cert = "${var.kubeconfig_ca_cert}"
kubeconfig_kubelet_cert = "${var.kubeconfig_kubelet_cert}"
kubeconfig_kubelet_key = "${var.kubeconfig_kubelet_key}"
kubeconfig_server = "${var.kubeconfig_server}"
}
}
data "ct_config" "worker_ign" {
content = "${data.template_file.worker_config.rendered}"
pretty_print = false
}
resource "google_compute_instance_template" "worker" {
name_prefix = "${var.cluster_name}-worker-"
description = "Worker Instance template"
machine_type = "${var.machine_type}"
metadata {
user-data = "${data.ct_config.worker_ign.rendered}"
}
scheduling {
automatic_restart = "${var.preemptible ? false : true}"
preemptible = "${var.preemptible}"
}
disk {
auto_delete = true
boot = true
source_image = "${var.os_image}"
disk_size_gb = "${var.disk_size}"
}
network_interface {
network = "${var.network}"
# Ephemeral external IP
access_config = {}
}
can_ip_forward = true
tags = ["worker"]
lifecycle {
# To update an Instance Template, Terraform should replace the existing resource
create_before_destroy = true
}
}