feat: add external lb

Author: Denise Perez

clients.tf

@@ -11,7 +11,7 @@ module "clients" {
   vm_identity_name             = var.client_identity_name
   frontend_container_cores_num = var.clients_use_dpdk ? var.client_frontend_cores : 1
   instance_type                = var.client_instance_type
-  backend_lb_ip                = var.create_lb ? azurerm_lb.backend_lb[0].private_ip_address : ""
+  backend_lb_ip                = var.create_lb ? var.assign_public_ip ? azurerm_public_ip.backend_ip[0].ip_address : azurerm_lb.backend_lb[0].private_ip_address : ""
   ssh_public_key               = var.ssh_public_key == null ? tls_private_key.ssh_key[0].public_key_openssh : var.ssh_public_key
   ppg_id                       = var.client_placement_group_id == "" ? local.placement_group_id : var.client_placement_group_id
   assign_public_ip             = local.assign_public_ip

lb.tf

@@ -1,16 +1,40 @@
+locals {
+  alb_external_ip = var.assign_public_ip ? 1 : 0
+}
 # ================= ui lb =========================== #
+resource "azurerm_public_ip" "ui_ip" {
+  count               = var.assign_public_ip ? 1 : 0
+  name                = "${var.prefix}-${var.cluster_name}-ui-public-ip"
+  location            = local.location
+  resource_group_name = local.resource_group_name
+  allocation_method   = "Static"
+  sku                 = "Standard"
+}
+
 resource "azurerm_lb" "ui_lb" {
   count               = var.create_lb ? 1 : 0
   name                = "${var.prefix}-${var.cluster_name}-ui-lb"
   resource_group_name = var.rg_name
   location            = data.azurerm_resource_group.rg.location
   sku                 = "Standard"
-  frontend_ip_configuration {
-    name                          = "${var.prefix}-${var.cluster_name}-ui-lb-frontend"
-    subnet_id                     = data.azurerm_subnet.subnet.id
-    private_ip_address_allocation = "Dynamic"
-    private_ip_address_version    = "IPv4"
+  dynamic "frontend_ip_configuration" {
+    for_each = range(0, local.alb_external_ip)
+    content {
+      name                 = "${var.prefix}-${var.cluster_name}-public-ui-frontend"
+      public_ip_address_id = azurerm_public_ip.ui_ip[0].id
+
+    }
+  }
+  dynamic "frontend_ip_configuration" {
+    for_each = range(local.alb_external_ip, 1)
+    content {
+      name                          = "${var.prefix}-${var.cluster_name}-ui-lb-frontend"
+      subnet_id                     = data.azurerm_subnet.subnet.id
+      private_ip_address_allocation = "Dynamic"
+      private_ip_address_version    = "IPv4"
+    }
   }
+
   tags = merge(var.tags_map, { "weka_cluster" : var.cluster_name })
   lifecycle {
     ignore_changes = [tags]
@@ -53,18 +77,37 @@ resource "azurerm_lb_rule" "ui_lb_rule" {
 }
 
 # ================= backend lb =========================== #
+resource "azurerm_public_ip" "backend_ip" {
+  count               = var.assign_public_ip ? 1 : 0
+  name                = "${var.prefix}-${var.cluster_name}-backend-public-ip"
+  location            = local.location
+  resource_group_name = local.resource_group_name
+  allocation_method   = "Static"
+  sku                 = "Standard"
+}
+
 resource "azurerm_lb" "backend_lb" {
   count               = var.create_lb ? 1 : 0
   name                = "${var.prefix}-${var.cluster_name}-backend-lb"
   resource_group_name = var.rg_name
   location            = data.azurerm_resource_group.rg.location
   sku                 = "Standard"
   tags                = merge(var.tags_map, { "weka_cluster" : var.cluster_name })
-  frontend_ip_configuration {
-    name                          = "${var.prefix}-${var.cluster_name}-backend-lb-frontend"
-    subnet_id                     = data.azurerm_subnet.subnet.id
-    private_ip_address_allocation = "Dynamic"
-    private_ip_address_version    = "IPv4"
+  dynamic "frontend_ip_configuration" {
+    for_each = range(0, local.alb_external_ip)
+    content {
+      name                 = "${var.prefix}-${var.cluster_name}-public-backend-frontend"
+      public_ip_address_id = azurerm_public_ip.backend_ip[0].id
+    }
+  }
+  dynamic "frontend_ip_configuration" {
+    for_each = range(local.alb_external_ip, 1)
+    content {
+      name                          = "${var.prefix}-${var.cluster_name}-backend-lb-frontend"
+      subnet_id                     = data.azurerm_subnet.subnet.id
+      private_ip_address_allocation = "Dynamic"
+      private_ip_address_version    = "IPv4"
+    }
   }
   lifecycle {
     ignore_changes = [tags]
@@ -107,7 +150,7 @@ resource "azurerm_lb_rule" "backend_lb_rule" {
 }
 
 resource "azurerm_private_dns_a_record" "dns_a_record_backend_lb" {
-  count               = var.create_lb ? 1 : 0
+  count               = var.create_lb && !var.assign_public_ip ? 1 : 0
   name                = lower("${var.cluster_name}-backend")
   zone_name           = local.private_dns_zone_name
   resource_group_name = local.private_dns_rg_name