typhoon/aws/container-linux/kubernetes/controllers.tf

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# Discrete DNS records for each controller's private IPv4 for etcd usage
resource "aws_route53_record" "etcds" {
count = var.controller_count
# DNS Zone where record should be created
zone_id = var.dns_zone_id
name = format("%s-etcd%d.%s.", var.cluster_name, count.index, var.dns_zone)
type = "A"
ttl = 300
# private IPv4 address for etcd
records = [element(aws_instance.controllers.*.private_ip, count.index)]
}
# Controller instances
resource "aws_instance" "controllers" {
count = var.controller_count
tags = {
Name = "${var.cluster_name}-controller-${count.index}"
}
instance_type = var.controller_type
ami = local.ami_id
user_data = element(data.ct_config.controller-ignitions.*.rendered, count.index)
# storage
root_block_device {
volume_type = var.disk_type
volume_size = var.disk_size
iops = var.disk_iops
}
# network
associate_public_ip_address = true
subnet_id = element(aws_subnet.public.*.id, count.index)
vpc_security_group_ids = [aws_security_group.controller.id]
lifecycle {
ignore_changes = [
ami,
user_data,
]
}
}
# Controller Ignition configs
data "ct_config" "controller-ignitions" {
count = var.controller_count
content = element(
data.template_file.controller-configs.*.rendered,
count.index,
)
pretty_print = false
snippets = var.controller_clc_snippets
}
# Controller Container Linux configs
data "template_file" "controller-configs" {
count = var.controller_count
template = file("${path.module}/cl/controller.yaml.tmpl")
vars = {
# Cannot use cyclic dependencies on controllers or their DNS records
etcd_name = "etcd${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(",", data.template_file.etcds.*.rendered)
cgroup_driver = local.flavor == "flatcar" && local.channel == "edge" ? "systemd" : "cgroupfs"
kubeconfig = indent(10, module.bootkube.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
}
}
data "template_file" "etcds" {
count = var.controller_count
template = "etcd$${index}=https://$${cluster_name}-etcd$${index}.$${dns_zone}:2380"
vars = {
index = count.index
cluster_name = var.cluster_name
dns_zone = var.dns_zone
}
}