Hi there,

I need some assistance on how to reference the values from the objects imported by "terraform import"

Let us start from the beginning of the life. You can reproduce this at your end too.

Input: Resource group, Virtual network and Virtual subnet created in Azure Portal.

Question to the instructor: Do I have to import each resource? or Just importing virtual network is sufficient? The reason I ask is when I import virtual network, I see resource group and subnet(s) so why to import them again? Or is there an explicit need to import each resource so that terraform destroy won't destroy them? Please clarify

Expected Outcome: Be able to spin up a Virtual machine with NIC card, storage account, managed disk, network security group.

Step 1. There exist no .terraform directory and no terraform.tfstate file, Let us examine the basic terraform state file.

[[email protected] /data/OnlyOnMyPC/terraform_iac/win_2016_datacentre_vm/aos-1.v3]ls -l
total 12
-rwxrwx---. 1 root vboxsf 1564 Oct 26 08:56 aos-1.tf
-rwxrwx---. 1 root vboxsf 1577 Oct 11 22:07 reuse_import
-rwxrwx---. 1 root vboxsf 642 Oct 21 23:46 terraform.tfvars
[[email protected] /data/OnlyOnMyPC/terraform_iac/win_2016_datacentre_vm/aos-1.v3]

##################################################################################

VARIABLES

##################################################################################
variable "ARM_SUBSCRIPTION_ID" {}

variable "ARM_CLIENT_ID" {}

variable "ARM_CLIENT_SECRET" {}

variable "ARM_TENANT_ID" {}

variable "Resource_group_name" {}

variable "Location" {}

variable "automation_account_name" {}

variable "virtual_network_name" {}

variable "address_space" {
type = "list"
}
variable "address_prefix" {
type = "list"
}

variable "virtual_network_subnet" {}

variable "virtual_network_subnet_name" {}

variable "virtual_network_nic" {

}
variable "virtual_machine_name" {}

variable "vm-hostname" {}

variable "vm-username" {}

variable "vm-password" {}

##################################################################################

PROVIDERS

##################################################################################

provider "azurerm" {
subscription_id="${var.ARM_SUBSCRIPTION_ID}"
client_id="${var.ARM_CLIENT_ID}"
client_secret="${var.ARM_CLIENT_SECRET}"
tenant_id="${var.ARM_TENANT_ID}"
}

##################################################################################

Creating Resource Group

##################################################################################
data "azurerm_resource_group" "tf_resource_group" {
name = "test_resource_group"
}

resource "azurerm_virtual_network" "test_virtual_network" {
}

2. I run terraform import to now import the test_virtual_network resource by the following command:

terraform import azurerm_virtual_network.test_virtual_network /subscriptions/06c532b0-b91a-42da-9fb9-9d5a0f8efe20/resourceGroups/test_resource_group/providers/Microsoft.Network/virtualNetworks/test_virtual_network

azurerm_virtual_network.test_virtual_network: Import complete!
Imported azurerm_virtual_network (ID: /subscriptions/06c532b0-b91a-42da-9fb9-9d5a0f8efe20/resourceGroups/test_resource_group/providers/Microsoft.Network/virtualNetworks/test_virtual_network)
azurerm_virtual_network.test_virtual_network: Refreshing state... (ID: /subscriptions/06c532b0-b91a-42da-9fb9-...k/virtualNetworks/test_virtual_network)

Import Successful!

The resources that were imported are shown above. These resources are now in your Terraform state and will henceforth be managed by Terraform.

3. I now run terraform plan, now, terraform is asking me for address_value! But address_value, resource_group, subnet, all of the required information is already in the terraform state file!

terraform plan
var.address_prefix
Enter a value: ^C
Interrupt received.
Please wait for Terraform to exit or data loss may occur.
Gracefully shutting down...

Error: Error asking for user input: Error asking for address_prefix: interrupted

[[email protected] /data/OnlyOnMyPC/terraform_iac/win_2016_datacentre_vm/aos-1.v3]

Considering that I might need to import 100+ resources, it is not practical to input their values all over again, so I'm wondering how can I reference the values from terraform state show

[[email protected] /data/OnlyOnMyPC/terraform_iac/win_2016_datacentre_vm/aos-1.v3]terraform state list
azurerm_virtual_network.test_virtual_network
[[email protected] /data/OnlyOnMyPC/terraform_iac/win_2016_datacentre_vm/aos-1.v3]terraform state show
id = /subscriptions/06c532b0-b91a-42da-9fb9-9d5a0f8efe20/resourceGroups/test_resource_group/providers/Microsoft.Network/virtualNetworks/test_virtual_network
address_space.# = 1
address_space.0 = 10.197.0.0/16
dns_servers.# = 0
location = australiasoutheast
name = test_virtual_network
resource_group_name = test_resource_group
subnet.# = 2
subnet.27872635.address_prefix = 10.197.2.0/24
subnet.27872635.id = /subscriptions/06c532b0-b91a-42da-9fb9-9d5a0f8efe20/resourceGroups/test_resource_group/providers/Microsoft.Network/virtualNetworks/test_virtual_network/subnets/test_subnet2
subnet.27872635.name = test_subnet2
subnet.27872635.security_group =
subnet.3408639592.address_prefix = 10.197.1.0/24
subnet.3408639592.id = /subscriptions/06c532b0-b91a-42da-9fb9-9d5a0f8efe20/resourceGroups/test_resource_group/providers/Microsoft.Network/virtualNetworks/test_virtual_network/subnets/test_subnet
subnet.3408639592.name = test_subnet
subnet.3408639592.security_group =
tags.% = 0

5. I now want to spin up a VM in test_subnet and test_subnet2, how do I do that?

Example: https://www.terraform.io/docs/providers/azurerm/r/virtual_machine.html

variable "prefix" {
default = "tfvmex"
}

resource "azurerm_resource_group" "main" { I don't think I have to create as I terraform import has already imported the subnet, correct ?
name = "${var.prefix}-resources"
location = "West US 2"
}

resource "azurerm_virtual_network" "main" { I don't think I have to create as terraform import has imported the virtual network, correct?
name = "${var.prefix}-network"
address_space = ["10.0.0.0/16"]
location = "${azurerm_resource_group.main.location}"
resource_group_name = "${azurerm_resource_group.main.name}"
}

resource "azurerm_subnet" "internal" { I don't think I have to create as terraform import has already imported the subnet, correct?
name = "internal"
resource_group_name = "${azurerm_resource_group.main.name}"
virtual_network_name = "${azurerm_virtual_network.main.name}"
address_prefix = "10.0.2.0/24"
}

resource "azurerm_network_interface" "main" {
name = "${var.prefix}-nic"
location = "${azurerm_resource_group.main.location}" # How to refrence to my location which exist in terraform state file?
resource_group_name = "${azurerm_resource_group.main.name}"

ip_configuration {
name = "testconfiguration1"
subnet_id = "${azurerm_subnet.internal.id}" # How to refrence to subnet which exist in my terraform state file?
private_ip_address_allocation = "dynamic"
}
}

resource "azurerm_virtual_machine" "main" {
name = "${var.prefix}-vm"
location = "${azurerm_resource_group.main.location}" How to refrence to the location? it exist in state file
resource_group_name = "${azurerm_resource_group.main.name}" How to refrence to the resource group name, it exist in state file
network_interface_ids = ["${azurerm_network_interface.main.id}"]
vm_size = "Standard_DS1_v2"

Uncomment this line to delete the OS disk automatically when deleting the VM

delete_os_disk_on_termination = true

Uncomment this line to delete the data disks automatically when deleting the VM

delete_data_disks_on_termination = true

storage_image_reference {
publisher = "Canonical"
offer = "UbuntuServer"
sku = "16.04-LTS"
version = "latest"
}

storage_os_disk {
name = "myosdisk1"
caching = "ReadWrite"
create_option = "FromImage"
managed_disk_type = "Standard_LRS"
}

os_profile {
computer_name = "hostname"
admin_username = "testadmin"
admin_password = "Password1234!"
}

os_profile_linux_config {
disable_password_authentication = false
}

tags {
environment = "staging"
}
}

Would greatly appreciate your assistance and guidance.

Many thanks,
Ameya Agashe