Question 206176 in Azure Question posted in
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Enter Azure storage account variably in Terraform main.tf

How do I pass the Terraform storage account for the backend as variable?
I get the following error:

#main.tf

terraform {
  required_version = ">= 1.3"
  backend "azurerm" {
    resource_group_name  = "rg-tfstate"
    storage_account_name = var.arg5_terraformStorageAccount
    container_name       = "tfstate"
    key                  = "terraform.tfstate"
    
  }

#variables.tf

variable "arg5_terraformStorageAccount" {
  type        = string
  description = "terraformStorageAccount (sensitive)"
  sensitive   = true
}

│ Error: Variables not allowed
│ 
│   on main.tf line 7, in terraform:
│    7:     storage_account_name = var.arg5_terraformStorageAccount
│ 
│ Variables may not be used here.
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2

Answers


  1. Chosen as BEST ANSWER
    0

    I ended up using substitution.
    So I renamed my main.tf file to main.tftemplate
    In there I named the variable that I wanted to define dynamically STORAGEACCOUNT
    In my Github Actions I specified a variable called AZURE_TF_STORAGE_ACCOUNT

    Then before I run Terraform Apply, I run the following
    sed "s/STORAGEACCOUNT/${{ vars.AZURE_TF_STORAGE_ACCOUNT }}/g" main.tftemplate > main.tf
    This replaces STORAGEACCOUNT in main.tftemplate with the variable I added to Github Actions and it writes it into the main.tf file.

    You can do that with any String inside a file.


  2. 0

    You can’t do this, as you can’t use any variables in backend. You have to hardcode the value, or develop some-kind of wrapper around TF to do simple find-and-search substitution.

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