web.tf

resource "azurerm_virtual_network" "wordpress" {
  name                = "wordpress-vnet"
  address_space       = ["10.0.0.0/16"]
  location            = var.location
  resource_group_name = azurerm_resource_group.wordpress.name
  tags                = var.tags
}

resource "azurerm_subnet" "wordpress" {
  name                 = "wordpress-subnet"
  resource_group_name  = azurerm_resource_group.wordpress.name
  virtual_network_name = azurerm_virtual_network.wordpress.name
  address_prefixes     = ["10.0.2.0/24"]
}

resource "azurerm_public_ip" "wordpress" {
  name                = "wordpress-public-ip"
  location            = var.location
  resource_group_name = azurerm_resource_group.wordpress.name
  allocation_method   = "Static"
  domain_name_label   = random_string.fqdn.result
  tags                = var.tags
}

resource "azurerm_lb" "wordpress" {
  name                = "wordpress-lb"
  location            = var.location
  resource_group_name = azurerm_resource_group.wordpress.name

  frontend_ip_configuration {
    name                 = "PublicIPAddress"
    public_ip_address_id = azurerm_public_ip.wordpress.id
  }

  tags = var.tags
}

resource "azurerm_lb_backend_address_pool" "bpepool" {
  loadbalancer_id = azurerm_lb.wordpress.id
  name            = "BackEndAddressPool"
}

resource "azurerm_lb_probe" "wordpress" {
  resource_group_name = azurerm_resource_group.wordpress.name
  loadbalancer_id     = azurerm_lb.wordpress.id
  name                = "ssh-running-probe"
  port                = var.application_port
}

resource "azurerm_lb_rule" "lbnatrule" {
  resource_group_name            = azurerm_resource_group.wordpress.name
  loadbalancer_id                = azurerm_lb.wordpress.id
  name                           = "http"
  protocol                       = "Tcp"
  frontend_port                  = var.application_port
  backend_port                   = var.application_port
  backend_address_pool_id        = azurerm_lb_backend_address_pool.bpepool.id
  frontend_ip_configuration_name = "PublicIPAddress"
  probe_id                       = azurerm_lb_probe.wordpress.id
}

resource "azurerm_linux_virtual_machine_scale_set" "wordpress" {
  name                            = "vmscaleset"
  location                        = var.location
  resource_group_name             = azurerm_resource_group.wordpress.name
  sku                             = "Standard_DS1_v2"
  instances                       = 2
  admin_username                  = var.admin_username
  admin_password                  = var.admin_password
  disable_password_authentication = false
  custom_data                     = data.template_cloudinit_config.config.rendered

  source_image_reference {
    publisher = "Canonical"
    offer     = "UbuntuServer"
    sku       = "18.04-LTS"
    version   = "latest"
  }

  os_disk {
    storage_account_type = "Standard_LRS"
    caching              = "ReadWrite"
  }

  network_interface {
    name    = "NetworkInterface"
    primary = true

    ip_configuration {
      name                                   = "IPConfiguration"
      subnet_id                              = azurerm_subnet.wordpress.id
      load_balancer_backend_address_pool_ids = [azurerm_lb_backend_address_pool.bpepool.id]
      primary                                = true
    }
  }

  tags = var.tags
}

data "template_file" "script" {
  template = file("web.conf")
}

data "template_cloudinit_config" "config" {
  gzip          = true
  base64_encode = true

  part {
    filename     = "web.conf"
    content_type = "text/cloud-config"
    content      = data.template_file.script.rendered
  }

  depends_on = [azurerm_mysql_server.wordpress]
}