Add terraform module to deploy a hcloud loadbalancer

terraform/main.tf

@@ -3,4 +3,13 @@ module "private_server_group" {
   location                   = var.location
   network_zone               = var.network_zone
   server_count               = var.server_count
+  server_subnetwork_ip_range = var.subnetwork_ip_range
+}
+
+module "loadbalancer" {
+  source         = "./modules/loadbalancer"
+  location       = var.location
+  subnet_id      = module.private_server_group.subnetwork_id
+  lb_internal_ip = var.lb_internal_ip
+  lb_external_ip = var.lb_external_ip
 }

terraform/modules/loadbalancer/main.tf

@@ -0,0 +1,26 @@
+resource "hcloud_load_balancer" "main" {
+  name               = "main"
+  load_balancer_type = var.lb_type
+  location           = var.location
+  algorithm {
+    type = var.lb_algorithm
+  }
+}
+
+resource "hcloud_load_balancer_network" "main" {
+  load_balancer_id = hcloud_load_balancer.main.id
+  subnet_id        = var.subnet_id
+  ip               = var.lb_internal_ip
+}
+
+resource "hcloud_load_balancer_target" "main" {
+  type             = "label_selector"
+  load_balancer_id = hcloud_load_balancer.main.id
+  label_selector   = "app=web"
+  use_private_ip   = true
+}
+
+resource "hcloud_load_balancer_service" "main" {
+  load_balancer_id = hcloud_load_balancer.main.id
+  protocol         = "http"
+}

terraform/modules/loadbalancer/variables.tf

@@ -0,0 +1,40 @@
+variable "location" {
+  description = <<-EOT
+    Location of the infrastructure. Needs to be aligned with network zone.
+    For more information visit https://docs.hetzner.com/cloud/general/locations/
+  EOT
+  type        = string
+}
+
+variable "lb_type" {
+  description = "Type of loadbalancer"
+  type        = string
+  default     = "lb11"
+}
+
+variable "lb_algorithm" {
+  description = "Type of the Load Balancer Algorithm. round_robin or least_connections"
+  type        = string
+  default     = "least_connections"
+}
+
+variable "domain" {
+  description = "Domain name of the load balancer"
+  type        = string
+  default     = "wordpress-jr.senecops.com"
+}
+
+variable "lb_external_ip" {
+  description = "IP address of the loadbalancer"
+  type        = string
+}
+
+variable "lb_internal_ip" {
+  description = "Internal IP address of the loadbalancer"
+  type        = string
+}
+
+variable "subnet_id" {
+  description = "ID of the subnetwork to attach the loadbalancer to"
+  type        = string
+}

terraform/modules/loadbalancer/versions.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    hcloud = {
+      source  = "hetznercloud/hcloud"
+      version = "1.42.1"
+    }
+  }
+}

terraform/variables.tf

@@ -18,3 +18,18 @@ variable "server_count" {
   description = "The number of servers to create"
   type        = number
 }
+
+variable "subnetwork_ip_range" {
+  description = "Subnetwork IP range of the servers"
+  type        = string
+}
+
+variable "lb_external_ip" {
+  description = "IP address of the loadbalancer"
+  type        = string
+}
+
+variable "lb_internal_ip" {
+  description = "Internal IP address of the loadbalancer"
+  type        = string
+}