From b8b0a7ce22f6ab88fba059d584926656b910e1bb Mon Sep 17 00:00:00 2001
From: Vojtech Mares <vojtech@mares.cz>
Date: Sat, 23 Nov 2024 09:32:12 +0100
Subject: [PATCH] feat: add node pool module and use it for new node pool

---
 CHANGELOG.md                      |  8 ++++++
 machines.tf                       | 17 ++++++++++++
 modules/node-pool/v1/main.tf      | 45 +++++++++++++++++++++++++++++++
 modules/node-pool/v1/variables.tf | 40 +++++++++++++++++++++++++++
 modules/node-pool/v1/versions.tf  |  8 ++++++
 5 files changed, 118 insertions(+)
 create mode 100644 modules/node-pool/v1/main.tf
 create mode 100644 modules/node-pool/v1/variables.tf
 create mode 100644 modules/node-pool/v1/versions.tf

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3abaed0..6ec6e22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.7.0] - 2024-11-23
+
+### Added
+
+- Add node pool module
+- Add new node pool using the new module
+  - Using Intel-based instead of ARM-based CPUs
+
 ## [0.6.0] - 2024-11-23
 
 ### Changed
diff --git a/machines.tf b/machines.tf
index 18e2676..c6a56e6 100644
--- a/machines.tf
+++ b/machines.tf
@@ -94,3 +94,20 @@ resource "hcloud_server" "cthulhu_workers" {
     ip         = cidrhost(hcloud_network_subnet.workers.ip_range, count.index + 1)
   }
 }
+
+module "workers_v2" {
+  source = "./modules/node-pool/v1"
+
+  network_id         = hcloud_network.cthulhu.id
+  placement_group_id = hcloud_placement_group.cthulhu_workers.id
+  ssh_key_ids        = [data.hcloud_ssh_key.vojtechmares.id]
+
+  size        = 3
+  server_type = "cx32"
+  image       = "rocky-9"
+  location    = "fsn1"
+
+  subnet_cidr = "172.16.11.0/24"
+
+  cluster_name = "cthulhu"
+}
diff --git a/modules/node-pool/v1/main.tf b/modules/node-pool/v1/main.tf
new file mode 100644
index 0000000..e7e80c5
--- /dev/null
+++ b/modules/node-pool/v1/main.tf
@@ -0,0 +1,45 @@
+resource "random_string" "suffix" {
+  length  = 4
+  special = false
+  upper   = false
+}
+
+resource "hcloud_network_subnet" "pool" {
+  network_id   = var.network_id
+  type         = "cloud"
+  network_zone = "eu-central"
+  ip_range     = var.subnet_cidr
+}
+
+resource "hcloud_server" "pool" {
+  count = var.size
+
+  name        = "pool-${random_string.suffix.result}-${count.index + 1}"
+  image       = var.image
+  server_type = var.server_type
+  location    = var.location
+
+  backups                  = false
+  shutdown_before_deletion = true
+
+  placement_group_id = var.placement_group_id
+
+  ssh_keys = var.ssh_key_ids
+
+  labels = {
+    "k8s.node.role"    = "worker"
+    "k8s.node.name"    = "pool-${random_string.suffix.result}-${count.index}"
+    "k8s.cluster.name" = var.cluster_name
+    "k8s.node.pool"    = random_string.suffix.result
+  }
+
+  public_net {
+    ipv4_enabled = true
+    ipv6_enabled = false
+  }
+
+  network {
+    network_id = var.network_id
+    ip         = cidrhost(hcloud_network_subnet.pool.ip_range, count.index + 1)
+  }
+}
diff --git a/modules/node-pool/v1/variables.tf b/modules/node-pool/v1/variables.tf
new file mode 100644
index 0000000..46a0c8f
--- /dev/null
+++ b/modules/node-pool/v1/variables.tf
@@ -0,0 +1,40 @@
+variable "network_id" {
+  type = string
+}
+
+variable "placement_group_id" {
+  type = string
+}
+
+variable "size" {
+  type = number
+}
+
+variable "server_type" {
+  type = string
+}
+
+variable "location" {
+  type = string
+}
+
+variable "image" {
+  type = string
+}
+
+variable "cluster_name" {
+  type = string
+}
+
+variable "ssh_key_ids" {
+  type = list(string)
+}
+
+variable "subnet_cidr" {
+  type = string
+}
+
+variable "primary_ip_auto_delete" {
+  type    = bool
+  default = true
+}
diff --git a/modules/node-pool/v1/versions.tf b/modules/node-pool/v1/versions.tf
new file mode 100644
index 0000000..4d6fc64
--- /dev/null
+++ b/modules/node-pool/v1/versions.tf
@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    hcloud = {
+      source  = "hetznercloud/hcloud"
+      version = ">=1.47.0, <2.0.0"
+    }
+  }
+}