[Terraform-Openstack] Add optional Octavia loadbalancer for Master Nodes (#10924)

* terraform-openstack add optional master lb

* remove unnecessary spaces

* remove unnecessary spaces

* fix ci warnings

contrib/terraform/openstack/modules/compute/outputs.tf

@@ -0,0 +1,3 @@
+output "k8s_master_ips" {
+  value = concat(openstack_compute_instance_v2.k8s_master_no_floating_ip.*, openstack_compute_instance_v2.k8s_master_no_floating_ip_no_etcd.*)
+}

contrib/terraform/openstack/modules/loadbalancer/main.tf

@@ -0,0 +1,54 @@
+resource "openstack_lb_loadbalancer_v2" "k8s_lb" {
+  count             = var.k8s_master_loadbalancer_enabled ? 1 : 0
+  name              = "${var.cluster_name}-api-loadbalancer"
+  vip_subnet_id     = var.subnet_id
+}
+
+resource "openstack_lb_listener_v2" "api_listener"{
+  count             = var.k8s_master_loadbalancer_enabled ? 1 : 0
+  name              = "api-listener"
+  protocol          = "TCP"
+  protocol_port     = var.k8s_master_loadbalancer_listener_port
+  loadbalancer_id   = openstack_lb_loadbalancer_v2.k8s_lb[0].id
+  depends_on        = [ openstack_lb_loadbalancer_v2.k8s_lb ]
+}
+
+resource "openstack_lb_pool_v2" "api_pool" {
+  count             = var.k8s_master_loadbalancer_enabled ? 1 : 0
+  name              = "api-pool"
+  protocol          = "TCP"
+  lb_method         = "ROUND_ROBIN"
+  listener_id       = openstack_lb_listener_v2.api_listener[0].id
+  depends_on        = [ openstack_lb_listener_v2.api_listener ]
+}
+
+resource "openstack_lb_member_v2" "lb_member" {
+  count             = var.k8s_master_loadbalancer_enabled ? length(var.k8s_master_ips) : 0
+  name              = var.k8s_master_ips[count.index].name
+  pool_id           = openstack_lb_pool_v2.api_pool[0].id
+  address           = var.k8s_master_ips[count.index].access_ip_v4
+  protocol_port     = var.k8s_master_loadbalancer_server_port
+  depends_on        = [ openstack_lb_pool_v2.api_pool ]
+}
+
+resource "openstack_lb_monitor_v2" "monitor" {
+  count       = var.k8s_master_loadbalancer_enabled ? 1 : 0
+  name        = "Api Monitor"
+  pool_id     = openstack_lb_pool_v2.api_pool[0].id
+  type        = "TCP"
+  delay       = 10
+  timeout     = 5
+  max_retries = 5
+}
+
+resource "openstack_networking_floatingip_v2" "floatip_1" {
+  count = var.k8s_master_loadbalancer_enabled && var.k8s_master_loadbalancer_public_ip == "" ? 1 : 0
+  pool = var.floatingip_pool
+}
+
+resource "openstack_networking_floatingip_associate_v2" "public_ip" {
+  count             = var.k8s_master_loadbalancer_enabled ? 1 : 0
+  floating_ip       = var.k8s_master_loadbalancer_public_ip != "" ? var.k8s_master_loadbalancer_public_ip : openstack_networking_floatingip_v2.floatip_1[0].address
+  port_id           = openstack_lb_loadbalancer_v2.k8s_lb[0].vip_port_id
+  depends_on        = [ openstack_lb_loadbalancer_v2.k8s_lb ]
+}

contrib/terraform/openstack/modules/loadbalancer/variables.tf

@@ -0,0 +1,15 @@
+variable "cluster_name" {}
+
+variable "subnet_id" {}
+
+variable "floatingip_pool" {}
+
+variable "k8s_master_ips" {}
+
+variable "k8s_master_loadbalancer_enabled" {}
+
+variable "k8s_master_loadbalancer_listener_port" {}
+
+variable "k8s_master_loadbalancer_server_port" {}
+
+variable "k8s_master_loadbalancer_public_ip" {}

contrib/terraform/openstack/modules/loadbalancer/versions.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    openstack = {
+      source = "terraform-provider-openstack/openstack"
+    }
+  }
+  required_version = ">= 0.12.26"
+}