ingress: don't use private ip, make ipv6 optional

main.tf

@@ -166,8 +166,9 @@ resource "local_file" "hetzner_csi_config" {
 
 resource "local_file" "traefik_config" {
   content = templatefile("${path.module}/templates/traefik_config.yaml.tpl", {
-    lb_server_type = var.lb_server_type
+    lb_disable_ipv6 = var.lb_disable_ipv6
-    location       = var.location
+    lb_server_type  = var.lb_server_type
+    location        = var.location
   })
   filename             = "${path.module}/templates/rendered/traefik_config.yaml"
   file_permission      = "0644"

templates/traefik_config.yaml.tpl

@@ -10,7 +10,12 @@ spec:
       type: LoadBalancer
       annotations:
         "load-balancer.hetzner.cloud/name": "traefik"
+        # make hetzners load-balancer connect to our nodes via our private k3s-net.
         "load-balancer.hetzner.cloud/use-private-ip": "true"
+        # keep hetzner-ccm from exposing our private ingress ip, which in general isn't routeable from the public internet.
+        "load-balancer.hetzner.cloud/disable-private-ingress": "true"
+        # disable ipv6 by default, because external-dns doesn't support AAAA for hcloud yet https://github.com/kubernetes-sigs/external-dns/issues/2044
+        "load-balancer.hetzner.cloud/ipv6-disabled": "${lb_disable_ipv6}"
         "load-balancer.hetzner.cloud/location": "${location}"
         "load-balancer.hetzner.cloud/type": "${lb_server_type}"
         "load-balancer.hetzner.cloud/uses-proxyprotocol": "true"

variables.tf

@@ -34,6 +34,12 @@ variable "lb_server_type" {
   type        = string
 }
 
+variable "lb_disable_ipv6" {
+  description = "Disable ipv6 for the load balancer"
+  type        = bool
+  default     = false
+}
+
 variable "servers_num" {
   description = "Number of control plane nodes."
   type        = number