CODEWITHSUNDEEP
azure-devopsterraformazure-keyvault
MangeshBiradar
MangeshBiradar

Reputation: 3938

Accessing Terraform variables outside the module

I have a terraform folder structure like below. I am accessing an output variable from 01_app module to the 02_tenant module. However the output variable is not accessible across modules.

I am managing two different state files for these two folders. Can someone help me in accessing the output variables across modules.

enter image description here

I have declared a output variable in 01_app/main_infra_app.tf:

output "key_vault_id" {
  value = "${azurerm_key_vault.key_vault.id}"
}

02_tenant/variables.tf:

variable "key_vault_id" {
}

I have added below block in 02_tenant/main_infra_app.tf:

module "kv" {
  source = "./01_app"
  key_vault_value_name  =   "${01_app.key_vault_id}"
}

[EDIT: 01] This is the error log.

Terraform v0.12.9
2019-09-23T17:15:39.9624707Z [command]C:\hostedtoolcache\windows\terraform\0.12.9\x64\terraform.exe init --backend-config=d:\a\r1\a/_Infrastructure/terraform/02_tenant/var/backend.tfvars --reconfigure
2019-09-23T17:15:40.0555160Z ‌There are some problems with the configuration, described below.‌
2019-09-23T17:15:40.0555674Z 
2019-09-23T17:15:40.0556565Z The Terraform configuration must be valid before initialization so that
2019-09-23T17:15:40.0556859Z Terraform can determine which modules and providers need to be installed.‌
2019-09-23T17:15:40.0557069Z ‌
2019-09-23T17:15:40.0557287Z ‌Error: ‌Extra characters after interpolation expression‌
2019-09-23T17:15:40.0557482Z 
2019-09-23T17:15:40.0557678Z ‌  on main_infra_tenant.tf line 42, in module "x":‌
2019-09-23T17:15:40.0557881Z   42:   key_vault_value_name  =   "${01‌_app‌.key_vault_id}"‌
2019-09-23T17:15:40.0558082Z ‌
2019-09-23T17:15:40.0558277Z Expected a closing brace to end the interpolation expression, but found extra
2019-09-23T17:15:40.0558484Z characters.
2019-09-23T17:15:40.0558656Z ‌
2019-09-23T17:15:40.0696178Z ##[error]Terraform command 'init' failed with exit code '1'.:  Extra characters after interpolation expression

[EDIT 2] I have added below block in 02_tenant/main_infra_tenant.tf. As I have naming KV and RG conventions, I am now able to fetch the kv_id in second .tf file.

data "azurerm_key_vault" "kv" {
  name                = var.kv_name
  resource_group_name = var.rg_name
}

# Write to Azure KV 
resource "azurerm_key_vault_secret" "kv_secret_for_key" {
  name         =  var.key_name
  value        =  base64encode(random_string.generate_key.result)
  key_vault_id =  "${data.azurerm_key_vault.kv.id}"

}

Upvotes: 2

Views: 2780

Answers (1)

Adil B
Adil B

Reputation: 16806

It looks like your current code is using the key_vault_id output from the 01_app module as an input to initialize the module itself. You should instead use the key_vault_id output from 01_app in another piece of infrastructure.

Try doing something like this instead to use 01_app's output variable key_vault_id in 02_tenant:

In 02_tenant/main_infra_app.tf:

module "kv" {
  source                =   "./01_app"
  key_vault_value_name  =   "somevalue"
}

data "azurerm_key_vault_secret" "test" {
  name         = "key-vault-name"
  key_vault_id = "${module.kv.key_vault_id}"
}

So now your code uses 01_app's output key_vault_id in the 02_tenant module.

Upvotes: 1

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