Move declaration of primary IPs into kubernetes-module

modules/hetzner/kubernetes/main.tf

@@ -1,3 +1,23 @@
+resource "hcloud_primary_ip" "ipv4" {
+  count = length(var.servers)
+
+  name          = "k8s_primary_ipv4_${count.index}"
+  datacenter    = var.servers[count.index].ip_datacenter
+  type          = "ipv4"
+  assignee_type = "server"
+  auto_delete   = var.auto_delete_primary_ips
+}
+
+resource "hcloud_primary_ip" "ipv6" {
+  count = length(var.servers)
+
+  name          = "k8s_primary_ipv6_${count.index}"
+  datacenter    = var.servers[count.index].ip_datacenter
+  type          = "ipv6"
+  assignee_type = "server"
+  auto_delete   = var.auto_delete_primary_ips
+}
+
 locals {
   network           = "10.0.0.0/16"
   subnet_eu_central = "10.0.0.0/24"
@@ -5,6 +25,8 @@ locals {
     for idx, config in var.servers : "${var.name}-server-${idx + 1}" => merge(
       config,
       {
+        ipv4_id  = hcloud_primary_ip.ipv4[idx].id
+        ipv6_id  = hcloud_primary_ip.ipv6[idx].id
         ip       = cidrhost(local.subnet_eu_central, idx + 2)
         first_ip = idx == 0 ? "" : cidrhost(local.subnet_eu_central, 2)
       }

modules/hetzner/kubernetes/variables.tf

@@ -8,10 +8,9 @@ variable "ssh_keys" {
 
 variable "servers" {
   type = list(object({
-    ipv4_id  = number
-    ipv6_id  = number
-    type     = string
-    location = string
+    type          = string
+    location      = string
+    ip_datacenter = string
   }))
 }
 
@@ -24,26 +23,37 @@ variable "agents" {
 }
 
 variable "ping_enabled" {
-  type = bool
+  type    = bool
   default = true
 }
 
 variable "public_tcp_services" {
-  type = map(list(string))
+  type    = map(list(string))
   default = {}
 }
 
 variable "kubernetes_exposed_ips" {
-  type = list(string)
+  type    = list(string)
   default = []
 }
 
 variable "ssh_exposed_ips" {
-  type = list(string)
+  type    = list(string)
   default = []
 }
 
 variable "ssh_port" {
-  type = number
+  type    = number
   default = 1022
 }
+
+variable "auto_delete_primary_ips" {
+  default     = true
+  description = <<EOF
+  Set this to "false" to keep the primary IPs bound to your Hetzner-Account, even after a destroy.
+  This setting would allow for reuse of the same IPs between multiple create/destroy cycles.
+  Though, it doesn't guarantee reuse of the same IPs.
+
+  Note, that reserved IPs will create costs, even if they're not used.
+  EOF
+}