main.tf

data "azurerm_subnet" "lookup" {
  count                = var.subnet_id == "" ? 1 : 0
  name                 = var.subnet_name
  virtual_network_name = var.vnet_name
  resource_group_name  = var.resource_group_name
}

locals {
  subnet_id = var.subnet_id != "" ? var.subnet_id : data.azurerm_subnet.lookup[0].id
}

resource "azurerm_network_interface" "this" {
  name                = "${var.name}-nic"
  location            = var.location
  resource_group_name = var.resource_group_name

  ip_configuration {
    name                          = "internal"
    subnet_id                     = local.subnet_id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id          = var.create_public_ip ? azurerm_public_ip.this[0].id : null
  }

  tags = var.tags
}

resource "azurerm_public_ip" "this" {
  count               = var.create_public_ip ? 1 : 0
  name                = "${var.name}-pip"
  location            = var.location
  resource_group_name = var.resource_group_name
  allocation_method   = "Static"
  sku                 = "Standard"

  tags = var.tags
}

resource "azurerm_linux_virtual_machine" "this" {
  name                            = var.name
  location                        = var.location
  resource_group_name             = var.resource_group_name
  size                            = var.vm_size
  admin_username                  = var.admin_username
  disable_password_authentication = true

  network_interface_ids = [
    azurerm_network_interface.this.id,
  ]

  admin_ssh_key {
    username   = var.admin_username
    public_key = var.ssh_public_key
  }

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = var.os_disk_type
    disk_size_gb         = var.os_disk_size_gb
  }

  source_image_reference {
    publisher = var.image_publisher
    offer     = var.image_offer
    sku       = var.image_sku
    version   = var.image_version
  }

  tags = var.tags
}