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control_planes.tf
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control_planes.tf
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module "control_planes" {
source = "./modules/host"
providers = {
hcloud = hcloud,
}
for_each = local.control_plane_nodes
name = "${var.use_cluster_name_in_node_name ? "${var.cluster_name}-" : ""}${each.value.nodepool_name}"
microos_snapshot_id = substr(each.value.server_type, 0, 3) == "cax" ? data.hcloud_image.microos_arm_snapshot.id : data.hcloud_image.microos_x86_snapshot.id
base_domain = var.base_domain
ssh_keys = length(var.ssh_hcloud_key_label) > 0 ? concat([local.hcloud_ssh_key_id], data.hcloud_ssh_keys.keys_by_selector[0].ssh_keys.*.id) : [local.hcloud_ssh_key_id]
ssh_port = var.ssh_port
ssh_public_key = var.ssh_public_key
ssh_private_key = var.ssh_private_key
ssh_additional_public_keys = length(var.ssh_hcloud_key_label) > 0 ? concat(var.ssh_additional_public_keys, data.hcloud_ssh_keys.keys_by_selector[0].ssh_keys.*.public_key) : var.ssh_additional_public_keys
firewall_ids = [hcloud_firewall.k3s.id]
placement_group_id = var.placement_group_disable ? null : (each.value.placement_group == null ? hcloud_placement_group.control_plane[each.value.placement_group_compat_idx].id : hcloud_placement_group.control_plane_named[each.value.placement_group].id)
location = each.value.location
server_type = each.value.server_type
backups = each.value.backups
ipv4_subnet_id = hcloud_network_subnet.control_plane[[for i, v in var.control_plane_nodepools : i if v.name == each.value.nodepool_name][0]].id
dns_servers = var.dns_servers
k3s_registries = var.k3s_registries
k3s_registries_update_script = local.k3s_registries_update_script
cloudinit_write_files_common = local.cloudinit_write_files_common
cloudinit_runcmd_common = local.cloudinit_runcmd_common
swap_size = each.value.swap_size
zram_size = each.value.zram_size
keep_disk_size = var.keep_disk_cp
# 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.
private_ipv4 = cidrhost(hcloud_network_subnet.control_plane[[for i, v in var.control_plane_nodepools : i if v.name == each.value.nodepool_name][0]].ip_range, each.value.index + 101)
labels = merge(local.labels, local.labels_control_plane_node)
automatically_upgrade_os = var.automatically_upgrade_os
depends_on = [
hcloud_network_subnet.control_plane,
hcloud_placement_group.control_plane,
]
}
resource "hcloud_load_balancer" "control_plane" {
count = var.use_control_plane_lb ? 1 : 0
name = "${var.cluster_name}-control-plane"
load_balancer_type = var.control_plane_lb_type
location = var.load_balancer_location
labels = merge(local.labels, local.labels_control_plane_lb)
delete_protection = var.enable_delete_protection.load_balancer
}
resource "hcloud_load_balancer_network" "control_plane" {
count = var.use_control_plane_lb ? 1 : 0
load_balancer_id = hcloud_load_balancer.control_plane.*.id[0]
subnet_id = hcloud_network_subnet.control_plane.*.id[0]
enable_public_interface = var.control_plane_lb_enable_public_interface
ip = cidrhost(hcloud_network_subnet.control_plane.*.ip_range[0], 1)
}
resource "hcloud_load_balancer_target" "control_plane" {
count = var.use_control_plane_lb ? 1 : 0
depends_on = [hcloud_load_balancer_network.control_plane]
type = "label_selector"
load_balancer_id = hcloud_load_balancer.control_plane.*.id[0]
label_selector = join(",", [for k, v in merge(local.labels, local.labels_control_plane_node) : "${k}=${v}"])
use_private_ip = true
}
resource "hcloud_load_balancer_service" "control_plane" {
count = var.use_control_plane_lb ? 1 : 0
load_balancer_id = hcloud_load_balancer.control_plane.*.id[0]
protocol = "tcp"
destination_port = "6443"
listen_port = "6443"
}
locals {
k3s-config = { for k, v in local.control_plane_nodes : k => merge(
{
node-name = module.control_planes[k].name
server = length(module.control_planes) == 1 ? null : "https://${
var.use_control_plane_lb ? hcloud_load_balancer_network.control_plane.*.ip[0] :
module.control_planes[k].private_ipv4_address == module.control_planes[keys(module.control_planes)[0]].private_ipv4_address ?
module.control_planes[keys(module.control_planes)[1]].private_ipv4_address :
module.control_planes[keys(module.control_planes)[0]].private_ipv4_address}:6443"
token = local.k3s_token
disable-cloud-controller = true
disable-kube-proxy = var.disable_kube_proxy
disable = local.disable_extras
kubelet-arg = concat(local.kubelet_arg, var.k3s_global_kubelet_args, var.k3s_control_plane_kubelet_args, v.kubelet_args)
kube-controller-manager-arg = local.kube_controller_manager_arg
flannel-iface = local.flannel_iface
node-ip = module.control_planes[k].private_ipv4_address
advertise-address = module.control_planes[k].private_ipv4_address
node-label = v.labels
node-taint = v.taints
selinux = true
cluster-cidr = var.cluster_ipv4_cidr
service-cidr = var.service_ipv4_cidr
cluster-dns = var.cluster_dns_ipv4
write-kubeconfig-mode = "0644" # needed for import into rancher
},
lookup(local.cni_k3s_settings, var.cni_plugin, {}),
var.use_control_plane_lb ? {
tls-san = concat([hcloud_load_balancer.control_plane.*.ipv4[0], hcloud_load_balancer_network.control_plane.*.ip[0]], var.additional_tls_sans)
} : {
tls-san = concat([
module.control_planes[k].ipv4_address
], var.additional_tls_sans)
},
local.etcd_s3_snapshots,
var.control_planes_custom_config
) }
}
resource "null_resource" "control_plane_config" {
for_each = local.control_plane_nodes
triggers = {
control_plane_id = module.control_planes[each.key].id
config = sha1(yamlencode(local.k3s-config[each.key]))
}
connection {
user = "root"
private_key = var.ssh_private_key
agent_identity = local.ssh_agent_identity
host = module.control_planes[each.key].ipv4_address
port = var.ssh_port
}
# Generating k3s server config file
provisioner "file" {
content = yamlencode(local.k3s-config[each.key])
destination = "/tmp/config.yaml"
}
provisioner "remote-exec" {
inline = [local.k3s_config_update_script]
}
depends_on = [
null_resource.first_control_plane,
hcloud_network_subnet.control_plane
]
}
resource "null_resource" "control_planes" {
for_each = local.control_plane_nodes
triggers = {
control_plane_id = module.control_planes[each.key].id
}
connection {
user = "root"
private_key = var.ssh_private_key
agent_identity = local.ssh_agent_identity
host = module.control_planes[each.key].ipv4_address
port = var.ssh_port
}
# Install k3s server
provisioner "remote-exec" {
inline = local.install_k3s_server
}
# Start the k3s server and wait for it to have started correctly
provisioner "remote-exec" {
inline = [
"systemctl start k3s 2> /dev/null",
# prepare the needed directories
"mkdir -p /var/post_install /var/user_kustomize",
# wait for the server to be ready
<<-EOT
timeout 360 bash <<EOF
until systemctl status k3s > /dev/null; do
systemctl start k3s 2> /dev/null
echo "Waiting for the k3s server to start..."
sleep 3
done
EOF
EOT
]
}
depends_on = [
null_resource.first_control_plane,
null_resource.control_plane_config,
hcloud_network_subnet.control_plane
]
}