Terraform templates which result in crash

main.tf

provider "azurerm" {
  environment = "public"
}

terraform {
  backend "azurerm" {
    storage_account_name = "tfstate"
    resource_group_name  = "tfstate-rg"
    container_name       = "tfstate"
    key                  = "terraform.tfstate"
  }
}

resource "azurerm_resource_group" "hub-services" {
  name     = "hub-services-rg"
  location = "eastus"

  tags = {}
}

module "network" {
  source              = "./network/"
  environment         = "hub-services"
  vnet_name           = "hub-services-vnet"
  resource_group_name = azurerm_resource_group.hub-services.name
  region              = "eastus"
  address_space       = list("10.0.0.0/22")
  subnets             = {
    public = "10.0.0.0/24"
    private = "10.0.1.0/24"
    data = "10.0.2.0/24"
  }
  jumpbox_name        = "hub-services-jumpbox"
  vm_size             = "Standard_DS1_V2"
  vm_os_publisher     = "OpenLogic"
  vm_os_offer         = "CentOS"
  vm_os_sku           = "7.5"
  vm_os_version       = "latest"

  tags = {}
}

network.main.tf

#Azure Generic vNet Module

resource "azurerm_virtual_network" "vnet" {
  name                = var.vnet_name
  location            = var.region
  address_space       = var.address_space
  resource_group_name = var.resource_group_name
  dns_servers         = var.dns_servers
  tags                = var.tags
}

resource "azurerm_subnet" "subnet" {
  count                = length(var.subnets)

  name                 = "${var.environment}-${keys(var.subnets)[count.index]}-subnet"
  virtual_network_name = azurerm_virtual_network.vnet.name
  resource_group_name  = var.resource_group_name
  address_prefix       = var.subnets[keys(var.subnets)[count.index]]
}

data "azurerm_subnet" "jumpbox" {
  depends_on           = ["azurerm_subnet.subnet"]
  name                 = "${var.environment}-${var.jumpbox_subnet_name}-subnet"
  virtual_network_name = azurerm_virtual_network.vnet.name
  resource_group_name  = var.resource_group_name
}

module "jumpbox" {
  depends_on          = ["azurerm_subnet.subnet"]
  source              = "../standalone_vm"
  environment         = var.environment
  resource_group_name = var.resource_group_name
  region              = var.region
  subnet_id           = data.azurerm_subnet.jumpbox.id
  vm_name             = var.jumpbox_name
  vm_size             = var.vm_size
  vm_os_publisher     = var.vm_os_publisher
  vm_os_offer         = var.vm_os_offer
  vm_os_sku           = var.vm_os_sku
  vm_os_version       = var.vm_os_version
  tags                = var.tags
}

network.variables.tf

variable "environment" {
  description = "Name of target environment"
  default = "my"
}

variable "vnet_name" {
  description = "Name of the vnet to create"
}

variable "resource_group_name" {
  description = "Default resource group name that the network will be created in."
}

variable "region" {
  description = "The location/region where the core network will be created. The full list of Azure regions can be found at https://azure.microsoft.com/regions"
}

variable "address_space" {
  description = "The address space that is used by the virtual network."
  default     = ["10.0.0.0/16"]
}

# If no values specified, this defaults to Azure DNS
variable "dns_servers" {
  description = "The DNS servers to be used with vNet."
  default     = []
}

variable "subnets" {
  type        = "map"
  description = "A key/value map of subnet names and corresponding address prefix"

  default = {
    public = "10.0.0.0/24"
  }
}

variable "tags" {
  description = "The tags to associate with your network and subnets."
  type        = "map"
  default = {}
}

variable "jumpbox_name" {
  description = "Name of the jumpbox to create"
  default     = "jumpbox"
}

variable "jumpbox_subnet_name" {
  description = "Name of the target subnet for the jumpbox"
  default     = "public"
}

variable "vm_size" {
  description = "Specifies the size of the virtual machine."
  default     = "Standard_DS1_V2"
}

variable "vm_os_publisher" {
  description = "The name of the publisher of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "OpenLogic"
}

variable "vm_os_offer" {
  description = "The name of the offer of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "CentOS"
}

variable "vm_os_sku" {
  description = "The sku of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "7.5"
}

variable "vm_os_version" {
  description = "The version of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "latest"
}

standalone_vm.main.tf

# Create a public IP for the VM.
resource "azurerm_public_ip" "vm" {
  name                         = "${var.vm_name}-public-ip"
  location                     = var.region
  resource_group_name          = var.resource_group_name
  public_ip_address_allocation = "static"
  tags                         = var.tags
}

# Create a security group for the VM.
resource "azurerm_network_security_group" "vm" {
  name                = "${var.vm_name}-sg"
  location            = var.region
  resource_group_name = var.resource_group_name

  security_rule {
    name                       = "AllowSshInBound"
    priority                   = 1000
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "Tcp"
    source_port_range          = "*"
    destination_port_range     = "22"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }
}

# Create a network interface for the VM.
resource "azurerm_network_interface" "vm" {
  name                      = "${var.vm_name}-nic"
  location                  = var.region
  resource_group_name       = var.resource_group_name
  network_security_group_id = azurerm_network_security_group.vm.id
  tags                      = var.tags

  ip_configuration {
    name                          = "${var.vm_name}-configuration"
    subnet_id                     = var.subnet_id
    private_ip_address_allocation = "dynamic"
    public_ip_address_id          = azurerm_public_ip.vm.id
  }
}

# Provide a data source that references the public key to be used.
data "azurerm_key_vault_secret" "test" {
  name      = "vm-jumpbox-pub"
  vault_uri = "https://dn-vm-keyvault.vault.azure.net/"
}

# Create Azure VM for VM.
resource "azurerm_virtual_machine" "vm" {
  name                  = var.vm_name
  location              = var.region
  resource_group_name   = var.resource_group_name
  network_interface_ids = list(azurerm_network_interface.vm.id)
  vm_size               = var.vm_size
  tags                  = var.tags

  storage_image_reference {
    publisher = var.vm_os_publisher
    offer     = var.vm_os_offer
    sku       = var.vm_os_sku
    version   = var.vm_os_version
  }

  storage_os_disk {
    name              = "${var.vm_name}-osdisk"
    caching           = "ReadWrite"
    create_option     = "FromImage"
    managed_disk_type = "Standard_LRS"
  }

  os_profile_linux_config {
    disable_password_authentication = true

    ssh_keys {
      path     = "/home/centos/.ssh/authorized_keys"
      key_data = data.azurerm_key_vault_secret.test.value
    }
  }
}

standalone_vm.variables.tf

variable "environment" {
  description = "Name of target environment"
  default = "my"
}

variable "resource_group_name" {
  description = "Default resource group name that the network will be created in."
}

variable "region" {
  description = "The location/region where the core network will be created. The full list of Azure regions can be found at https://azure.microsoft.com/regions"
}

variable "subnet_id" {
  description = "ID of the target subnet"
}

variable "tags" {
  description = "The tags to associate with your network and subnets."
  type        = "map"
  default = {}
}

variable "vm_name" {
  description = "Name of the VM to create"
}

variable "vm_size" {
  description = "Specifies the size of the virtual machine."
  default     = "Standard_DS1_V2"
}

variable "vm_os_publisher" {
  description = "The name of the publisher of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "OpenLogic"
}

variable "vm_os_offer" {
  description = "The name of the offer of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "CentOS"
}

variable "vm_os_sku" {
  description = "The sku of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "7.5"
}

variable "vm_os_version" {
  description = "The version of the image that you want to deploy. This is ignored when vm_os_id or vm_os_simple are provided."
  default     = "latest"
}