terraform-hcloud-kube-hetzner/control_planes.tf

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module "control_planes" {
source = "./modules/host"
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count = var.control_plane_count
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name = "${var.use_cluster_name_in_node_name ? "${var.cluster_name}-" : ""}control-plane"
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ssh_keys = [hcloud_ssh_key.k3s.id]
public_key = var.public_key
private_key = var.private_key
additional_public_keys = var.additional_public_keys
firewall_ids = [hcloud_firewall.k3s.id]
placement_group_id = hcloud_placement_group.k3s.id
location = var.location
server_type = var.control_plane_server_type
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ipv4_subnet_id = hcloud_network_subnet.subnet[1].id
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# We leave some room so 100 eventual Hetzner LBs that can be created perfectly safely
# It leaves the subnet with 254 x 254 - 100 = 64416 IPs to use, so probably enough.
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private_ipv4 = cidrhost(local.network_ipv4_subnets[1], count.index + 101)
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labels = {
"provisioner" = "terraform",
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"engine" = "k3s"
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}
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depends_on = [
hcloud_network_subnet.subnet
]
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}
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resource "null_resource" "control_planes" {
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count = var.control_plane_count
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triggers = {
control_plane_id = module.control_planes[count.index].id
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}
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connection {
user = "root"
private_key = local.ssh_private_key
agent_identity = local.ssh_identity
host = module.control_planes[count.index].ipv4_address
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}
# Generating k3s server config file
provisioner "file" {
content = yamlencode({
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node-name = module.control_planes[count.index].name
server = "https://${element(module.control_planes.*.private_ipv4_address, count.index > 0 ? 0 : 1)}:6443"
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token = random_password.k3s_token.result
disable-cloud-controller = true
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disable = ["servicelb", "local-storage"]
flannel-iface = "eth1"
kubelet-arg = "cloud-provider=external"
node-ip = module.control_planes[count.index].private_ipv4_address
advertise-address = module.control_planes[count.index].private_ipv4_address
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node-taint = var.allow_scheduling_on_control_plane ? [] : ["node-role.kubernetes.io/master:NoSchedule"]
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node-label = var.automatically_upgrade_k3s ? ["k3s_upgrade=true"] : []
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})
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destination = "/tmp/config.yaml"
}
# Install k3s server
provisioner "remote-exec" {
inline = local.install_k3s_server
}
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# Start the k3s server and wait for it to have started correctly
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provisioner "remote-exec" {
inline = [
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"systemctl start k3s 2> /dev/null",
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<<-EOT
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timeout 120 bash <<EOF
until systemctl status k3s > /dev/null; do
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systemctl start k3s 2> /dev/null
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echo "Waiting for the k3s server to start..."
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sleep 2
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done
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EOF
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EOT
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]
}
depends_on = [
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null_resource.first_control_plane,
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hcloud_network_subnet.subnet
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]
}