feat: Added exercise 3 and .gitignore

.gitignore

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+*/__pycache__
+**/.terraform/*
+**/*.tfstate
+**/*.tfstate.*

ex3/.terraform.lock.hcl

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+# This file is maintained automatically by "terraform init".
+# Manual edits may be lost in future updates.
+
+provider "registry.terraform.io/terraform-provider-openstack/openstack" {
+  version     = "1.42.0"
+  constraints = "~> 1.42.0"
+  hashes = [
+    "h1:hpQ+kc+S2Nwcqqt0TtBdiLKJpaLxq5z2eKrA+kjoMq4=",
+    "zh:116e297f03eb304819f8cffd66f25b77638435db2d612c2b1d56205cbbef485f",
+    "zh:332411f8425caaa9ca799cc60ccbab188c6108fa2765032a5cb22a5df36b5fc5",
+    "zh:3843cf3c563ae0348bcd41107508399df997a7293b2a3a79e73264be81dc456c",
+    "zh:4d16af37327d36bb86913220b763ed6e599b47db7702948f019e535c5b9413d4",
+    "zh:9557b325e4617977f0fec913673d2542556174811415417be7dee20f7ab2fec1",
+    "zh:95b4754370eda28624f7dfcfdfc4016775bf6433535b60a8f3d99fd651e71afa",
+    "zh:97c240eba6a179e5910c0afdee97f916ab4537b360db21143ab2dfb0919087e3",
+    "zh:b231c1c988914f4f0be3115a432f50cf43c410867f8b3aff7e3bf7c31739c940",
+    "zh:b3b105ee70e440d350d8fecf50d458ad7d4b9b4a3ab580e9b8ff1e3fec9a6b76",
+    "zh:b531f02dca64486c302046d959770a6b32ac26fc6d1830582e9959d0384dbe20",
+    "zh:b80a2e60dae300217f44318a74b7e45cfe7009a11b937f06fb07f677863cec59",
+    "zh:f18e8dada1e2941585893c579d169bc908c68cb7b71406c47cafc0a3bdcddbe8",
+    "zh:fbdc031f496fa1f80fcab41f1e3cf2e2f99b0266b685079b4a4c4c61720c914c",
+  ]
+}

ex3/main.tf

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+resource "openstack_networking_router_v2" "rt" {
+  name                = "rt"
+  admin_state_up      = "true"
+  external_network_id = var.network_external_id
+}
+
+resource "openstack_networking_network_v2" "network_internal" {
+  name = var.network_lan
+  admin_state_up = "true"
+}
+
+resource "openstack_networking_subnet_v2" "network_subnet" {
+  name = var.network_lan
+  network_id = openstack_networking_network_v2.network_internal.id
+  cidr = var.network_subnet_cidr
+  ip_version = 4
+  enable_dhcp = true
+  dns_nameservers = ["1.1.1.1"]
+}
+
+resource "openstack_networking_router_interface_v2" "network_router_interface" {
+  router_id = openstack_networking_router_v2.rt.id
+  subnet_id = openstack_networking_subnet_v2.network_subnet.id
+}
+
+resource "openstack_networking_floatingip_v2" "d2_fip" {
+  pool = "Ext-Net"
+}
+
+resource "openstack_compute_keypair_v2" "instance_keypair" {
+  provider   = openstack.ovh
+  name       = "instance_keypair"
+  public_key = file(var.ssh_pubkey)
+}
+
+resource "openstack_compute_instance_v2" "instance" {
+  name        = "d2_test"
+  provider    = openstack.ovh
+  image_name  = "Debian 12"
+  flavor_name = "d2-4"
+  key_pair    = openstack_compute_keypair_v2.instance_keypair.name
+  user_data = var.cloudinit_script
+  network {
+    name      = var.network_lan
+  }
+
+  depends_on = [ openstack_networking_subnet_v2.network_subnet ]
+}
+
+data "openstack_networking_port_v2" "port" {
+  device_id  = openstack_compute_instance_v2.instance.id
+  network_id = openstack_compute_instance_v2.instance.network.0.uuid
+}
+
+resource "openstack_networking_floatingip_associate_v2" "fip_associate" {
+  floating_ip = openstack_networking_floatingip_v2.d2_fip.address
+  port_id = data.openstack_networking_port_v2.port.id
+}

ex3/providers.tf

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+terraform {
+required_version    = ">= 0.14.0"
+  required_providers {
+    openstack = {
+      source  = "terraform-provider-openstack/openstack"
+      version = "~> 1.42.0"
+    }
+  }
+}
+
+provider "openstack" {
+  alias = "ovh"
+}

ex3/variables.tf

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+variable "network_external_id" {
+  type         = string
+  default      = "bcf59eb2-9d83-41cc-b4f5-0435ed594833"
+}
+
+variable "network_lan" {
+  type         = string
+  default      = "lan_d2_demo"
+}
+
+variable "network_subnet_cidr" {
+  type = string
+  default = "10.10.0.0/24"
+}
+
+variable "ssh_pubkey" {
+    type = string
+    default = "~/.ssh/id_ed25519.pub"
+}
+
+variable "cloudinit_script" {
+  type = string
+  default = "#!/bin/bash\nsudo apt update && sudo apt install -y nginx"
+}