ip -> ipv4...

...explictly label current ip values as ipv4, in order to more
easily add ipv6 support later on.

agents.tf

@@ -12,8 +12,8 @@ module "agents" {
   placement_group_id     = hcloud_placement_group.k3s.id
   location               = var.location
   server_type            = each.value.server_type
-  subnet_id              = hcloud_network_subnet.subnet[each.value.subnet].id
+  ipv4_subnet_id         = hcloud_network_subnet.subnet[each.value.subnet].id
-  private_ip             = cidrhost(var.network_subnets[each.value.subnet], each.value.index + 1)
+  private_ipv4           = cidrhost(var.network_ipv4_subnets[each.value.subnet], each.value.index + 1)
   labels = {
     "provisioner" = "terraform",
     "engine"      = "k3s"
@@ -44,7 +44,7 @@ resource "null_resource" "agents" {
   provisioner "file" {
     content = yamlencode({
       node-name     = module.agents[each.key].name
-      server        = "https://${local.first_control_plane_network_ip}:6443"
+      server        = "https://${local.first_control_plane_network_ipv4}:6443"
       token         = random_password.k3s_token.result
       kubelet-arg   = "cloud-provider=external"
       flannel-iface = "eth1"

control_planes.tf

@@ -12,8 +12,8 @@ module "control_planes" {
   placement_group_id     = hcloud_placement_group.k3s.id
   location               = var.location
   server_type            = var.control_plane_server_type
-  subnet_id              = hcloud_network_subnet.subnet["control_plane"].id
+  ipv4_subnet_id         = hcloud_network_subnet.subnet["control_plane"].id
-  private_ip             = cidrhost(var.network_subnets["control_plane"], count.index + 1)
+  private_ipv4           = cidrhost(var.network_ipv4_subnets["control_plane"], count.index + 1)
 
   labels = {
     "provisioner" = "terraform",

init.tf

@@ -96,11 +96,11 @@ resource "null_resource" "kustomization" {
     content = templatefile(
       "${path.module}/templates/traefik_config.yaml.tpl",
       {
-        load_balancer_disable_ipv6    = var.load_balancer_disable_ipv6
+        load_balancer_disable_ipv6 = var.load_balancer_disable_ipv6
-        load_balancer_type     = var.load_balancer_type
+        load_balancer_type         = var.load_balancer_type
-        location           = var.location
+        location                   = var.location
-        traefik_acme_tls   = var.traefik_acme_tls
+        traefik_acme_tls           = var.traefik_acme_tls
-        traefik_acme_email = var.traefik_acme_email
+        traefik_acme_email         = var.traefik_acme_email
     })
     destination = "/tmp/post_install/traefik.yaml"
   }

locals.tf

@@ -1,5 +1,5 @@
 locals {
-  first_control_plane_network_ip = module.control_planes[0].private_ipv4_address
+  first_control_plane_network_ipv4 = module.control_planes[0].private_ipv4_address
 
   ssh_public_key = trimspace(file(var.public_key))
   # ssh_private_key is either the contents of var.private_key or null to use a ssh agent.

main.tf

@@ -10,11 +10,11 @@ resource "hcloud_ssh_key" "k3s" {
 
 resource "hcloud_network" "k3s" {
   name     = "k3s"
-  ip_range = var.network_ip_range
+  ip_range = var.network_ipv4_range
 }
 
 resource "hcloud_network_subnet" "subnet" {
-  for_each     = var.network_subnets
+  for_each     = var.network_ipv4_subnets
   network_id   = hcloud_network.k3s.id
   type         = "cloud"
   network_zone = var.network_region
@@ -30,7 +30,7 @@ resource "hcloud_firewall" "k3s" {
     protocol  = "tcp"
     port      = "any"
     source_ips = [
-      var.network_ip_range,
+      var.network_ipv4_range,
       "127.0.0.1/32",
       "169.254.169.254/32",
       "213.239.246.1/32"
@@ -41,7 +41,7 @@ resource "hcloud_firewall" "k3s" {
     protocol  = "udp"
     port      = "any"
     source_ips = [
-      var.network_ip_range,
+      var.network_ipv4_range,
       "127.0.0.1/32",
       "169.254.169.254/32",
       "213.239.246.1/32"
@@ -51,7 +51,7 @@ resource "hcloud_firewall" "k3s" {
     direction = "in"
     protocol  = "icmp"
     source_ips = [
-      var.network_ip_range,
+      var.network_ipv4_range,
       "127.0.0.1/32",
       "169.254.169.254/32",
       "213.239.246.1/32"

modules/host/main.tf

@@ -64,7 +64,7 @@ resource "hcloud_server" "server" {
 }
 
 resource "hcloud_server_network" "server" {
-  ip        = var.private_ip
+  ip        = var.private_ipv4
   server_id = hcloud_server.server.id
-  subnet_id = var.subnet_id
+  subnet_id = var.ipv4_subnet_id
 }

modules/host/variables.tf

@@ -54,12 +54,12 @@ variable "location" {
   type        = string
 }
 
-variable "subnet_id" {
+variable "ipv4_subnet_id" {
   description = "The subnet id"
   type        = string
 }
 
-variable "private_ip" {
+variable "private_ipv4" {
   description = "Private IP for the server"
   type        = string
 }

output.tf

@@ -1,16 +1,16 @@
-output "controlplanes_public_ip" {
+output "control_planes_public_ipv4" {
   value       = module.control_planes.*.ipv4_address
-  description = "The public IP addresses of the controlplane server."
+  description = "The public IPv4 addresses of the controlplane server."
 }
 
-output "agents_public_ip" {
+output "agents_public_ipv4" {
   value = [
     for obj in module.agents : obj.ipv4_address
   ]
-  description = "The public IP addresses of the agent server."
+  description = "The public IPv4 addresses of the agent server."
 }
 
-output "load_balancer_public_ip" {
+output "load_balancer_public_ipv4" {
   description = "The public IPv4 address of the Hetzner load balancer"
   value       = data.hcloud_load_balancer.traefik.ipv4
 }

terraform.tfvars.example

@@ -9,8 +9,8 @@ private_key  = "/home/username/.ssh/id_ed25519"
 # For Hetzner server types see https://www.hetzner.com/cloud
 location         = "fsn1"       # change to `ash` for us-east Ashburn, Virginia location
 network_region   = "eu-central" # change to `us-east` if location is ash
-network_ip_range = "10.0.0.0/8"
+network_ipv4_range = "10.0.0.0/8"
-network_subnets = {
+network_ipv4_subnets = {
   control_plane = "10.1.0.0/16"
   subnet1       = "10.2.0.0/16"
   subnet2       = "10.3.0.0/16"

variables.tf

@@ -30,12 +30,12 @@ variable "network_region" {
   type        = string
 }
 
-variable "network_ip_range" {
+variable "network_ipv4_range" {
-  description = "Default IP range for network"
+  description = "Default IPv4 range for network"
   type        = string
 }
 
-variable "network_subnets" {
+variable "network_ipv4_subnets" {
   description = "Subnets definition for default network"
   type        = map(string)
 }
@@ -50,7 +50,6 @@ variable "control_plane_count" {
   type        = number
 }
 
-
 variable "load_balancer_type" {
   description = "Default load balancer server type"
   type        = string