Reference outputs from another local project in terraform

Consider the following directory structure

• project_resources
  • dns
    • main.tf
  • compute
    • main.tf
• development
  • main.tf
• production
  • main.tf
• global
  • main.tf

In my TF, I have a global module, which should only be run once. i.e. set up DNS with ACM etc.

Once the global module is setup, I may apply development or production. However, for both production and development, i need to set a record in my DNS – hence I need to be able to access the id of the DNS zone from the global module.

For the global env I obviously export the output from my DNS zone, e.g.:

output "route53_zone_id" {
    value = aws_route53_zone.proj_hosted_zone.id
}

Since I’m treating global, production and dev as separate "projects", I cannot reference route53_zone_id from a module import, so I did something along the lines of this (inspired by another SO post):

data "global_state" "global" {

  backend = "local"
  config = {
    path = "../global/terraform.tfstate"
  }
}

locals {
    dns_servers = data.global_state.global.outputs.route53_zone_id
}

but once I run terraform init, it seems as if terraform thinks that the global data object is a provider, since I get the following error:

Error: Failed to query available provider packages. Could not retrieve the list of available versions for provider hashicorp/global: provider registry registry.terraform.io does not have a provider named registry.terraform.io/hashicorp/global

I’m therefore keen to understand, what I am missing in terms of getting the output variables from the global project in respectively development and production environments.

>Solution :

This should work but with the terraform_remote_state data source:

data "terraform_remote_state" "global" {
  backend = "local"

  config = {
    path = "../global/terraform.tfstate"
  }
}