From 5cf6f9eef4022e8ba6b841a5f2093db956439c6c Mon Sep 17 00:00:00 2001
From: phaer <hello@phaer.org>
Date: Fri, 4 Mar 2022 22:04:07 +0100
Subject: [PATCH] add random pet names for cluster & nodes

---
 agents.tf                         |  6 +++++-
 control_planes.tf                 |  6 +++++-
 init.tf                           |  1 +
 main.tf                           | 13 ++++++++-----
 output.tf                         |  5 +++++
 templates/traefik_config.yaml.tpl |  4 ++--
 6 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/agents.tf b/agents.tf
index 10912ec..0bdb214 100644
--- a/agents.tf
+++ b/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
diff --git a/control_planes.tf b/control_planes.tf
index 34cf4bf..082319a 100644
--- a/control_planes.tf
+++ b/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
diff --git a/init.tf b/init.tf
index 36e85a3..39b2c47 100644
--- a/init.tf
+++ b/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
diff --git a/main.tf b/main.tf
index ce18aa8..1ca3bf6 100644
--- a/main.tf
+++ b/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]
 }
diff --git a/output.tf b/output.tf
index 4d2033e..aa0604c 100644
--- a/output.tf
+++ b/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."
diff --git a/templates/traefik_config.yaml.tpl b/templates/traefik_config.yaml.tpl
index 75ce20f..e78d957 100644
--- a/templates/traefik_config.yaml.tpl
+++ b/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-${cluster_pet_name}"
         # make hetzners load-balancer connect to our nodes via our private k3s
         "load-balancer.hetzner.cloud/use-private-ip": "true"
         # keep hetzner-ccm from exposing our private ingress ip, which in general isn't routeable from the public internet
@@ -28,4 +28,4 @@ spec:
       - "--certificatesresolvers.le.acme.tlschallenge=true"
       - "--certificatesresolvers.le.acme.email=${traefik_acme_email}"
       - "--certificatesresolvers.le.acme.storage=/data/acme.json"
-%{ endif ~}
\ No newline at end of file
+%{ endif ~}