CODEWITHSUNDEEP
modulescopeterraformoutput
mozh
mozh

Reputation: 33

How can I use the output of a module that is located at outer level of the caller module?

I'm working with terraform for a while and I didn't face any issues as I always followed a simple structure. But now I've started working on another project that doesn't seem like it adheres to best practices.

The project structure is like this:

> root-folder
   > modules
      > cloudfront
      > route53
      > team1
         > service1
            - main.tf
            - variables.tf
            - locals.tf

And what I'm trying to do is, use modules.cloudfront.some_output_value within the modules>team1>service1>main.tf file as seen below:

module "record" {
  source      = "../../route53"
  zone_id     = var.route53_zone_id
  record_name = local.record_name
  cdn_id       = module.cloudfront.some_output_value   //the question is about this line
}

But I'm unable to use it, since the IDE indicates there is no such module as module.cloudfront.

Does anyone know why I cannot use a module that is defined at an outer scope?

Terraform version: 1.2.0 (probably this's not related to a version based issue, but anyway.)

Upvotes: 0

Views: 1038

Answers (2)

stdtom
stdtom

Reputation: 762

It depends from where you invoke the cloudfront module.

Option 1

If you invoke both modules, service1 and cloudfront from the same parent, then you need to define a variable in service1 and explicitly pass the value:

service1 (Should be splitted into variables.tf and main.tf of course.)

variable "cdn_id" {
  type        = ...
  description = "..."
}

module "record" {
  source       = "../../route53"
  zone_id      = var.route53_zone_id
  record_name  = local.record_name
  cdn_id       = var.cdn_id
}

parent module (e.g. in root folder)

module "service1" {
  source        = "modules/team1/service1"
  cdn_id        = module.cloudfront.some_output_value
  some_var_name = some_value
  ...
}

module "cloudfront" {
  source        = "modules/cloudfront"
  some_var_name = some_value
  ...
}

Option 2

If you invoke it from service1, then the location of the module in the file hierarchy does not matter. You just have to set the source path right:

module "record" {
  source       = "../../route53"
  zone_id      = var.route53_zone_id
  record_name  = local.record_name
  cdn_id       = module.cloudfront.some_output_value
}

module "cloudfront" {
  source        = "../../cloudfront"
  some_var_name = some_value
  ...
}

Upvotes: 1

Marcin
Marcin

Reputation: 238081

You can't query outer modules from inner modules. If you have any variables/outputs in your outermodules that should be used in the inner modules, you have to explicitly pass them from the outer into inner modules.

Upvotes: 0

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