add random pet names for cluster & nodes

agents.tf

@@ -1,9 +1,13 @@
+resource "random_pet" "agents" {
+  for_each = local.agent_nodepools
+}
+
 module "agents" {
   source = "./modules/host"
 
   for_each = local.agent_nodepools
 
-  name                   = each.key
+  name                   = "${each.key}-${random_pet.cluster.id}-${random_pet.agents[each.key].id}"
   ssh_keys               = [hcloud_ssh_key.k3s.id]
   public_key             = var.public_key
   private_key            = var.private_key

control_planes.tf

@@ -1,8 +1,12 @@
+resource "random_pet" "control_planes" {
+  count = var.control_plane_count
+}
+
 module "control_planes" {
   source = "./modules/host"
 
   count = var.control_plane_count
-  name  = "control-plane-${count.index}"
+  name  = "control-plane-${random_pet.cluster.id}-${random_pet.control_planes[count.index].id}"
 
   ssh_keys               = [hcloud_ssh_key.k3s.id]
   public_key             = var.public_key

init.tf

@@ -94,6 +94,7 @@ resource "null_resource" "kustomization" {
     content = local.is_single_node_cluster ? "" : templatefile(
       "${path.module}/templates/traefik_config.yaml.tpl",
       {
+        cluster_pet_name           = random_pet.cluster.id
         load_balancer_disable_ipv6 = var.load_balancer_disable_ipv6
         load_balancer_type         = var.load_balancer_type
         location                   = var.location

main.tf

@@ -1,15 +1,18 @@
+resource "random_pet" "cluster" {
+}
+
 resource "random_password" "k3s_token" {
   length  = 48
   special = false
 }
 
 resource "hcloud_ssh_key" "k3s" {
-  name       = "k3s"
+  name       = "k3s-${random_pet.cluster.id}"
   public_key = local.ssh_public_key
 }
 
 resource "hcloud_network" "k3s" {
-  name     = "k3s"
+  name     = "k3s-${random_pet.cluster.id}"
   ip_range = var.network_ipv4_range
 }
 
@@ -22,7 +25,7 @@ resource "hcloud_network_subnet" "subnet" {
 }
 
 resource "hcloud_firewall" "k3s" {
-  name = "k3s"
+  name = "k3s-${random_pet.cluster.id}"
 
   dynamic "rule" {
     for_each = concat(local.base_firewall_rules, var.extra_firewall_rules)
@@ -37,7 +40,7 @@ resource "hcloud_firewall" "k3s" {
 }
 
 resource "hcloud_placement_group" "k3s" {
-  name = "k3s"
+  name = "k3s-${random_pet.cluster.id}"
   type = "spread"
   labels = {
     "provisioner" = "terraform",
@@ -47,7 +50,7 @@ resource "hcloud_placement_group" "k3s" {
 
 data "hcloud_load_balancer" "traefik" {
   count = local.is_single_node_cluster ? 0 : 1
-  name  = "traefik"
+  name  = "traefik-${random_pet.cluster.id}"
 
   depends_on = [null_resource.kustomization]
 }

output.tf

@@ -1,3 +1,8 @@
+output "cluster_pet_name" {
+  value       = random_pet.cluster
+  description = "Shared suffix for all resources belonging to this cluster."
+}
+
 output "control_planes_public_ipv4" {
   value       = module.control_planes.*.ipv4_address
   description = "The public IPv4 addresses of the controlplane server."

templates/traefik_config.yaml.tpl

@@ -9,7 +9,7 @@ spec:
       enabled: true
       type: LoadBalancer
       annotations:
-        "load-balancer.hetzner.cloud/name": "traefik"
+        "load-balancer.hetzner.cloud/name": "traefik-${cluster_pet_name}"
         # make hetzners load-balancer connect to our nodes via our private k3s
         "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