Question 255493 in Amazon Web Sevices Question posted in
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Amazon web services – Multiple output from modules in Terraform

I’m provisioning multiple EC2 instances (in this case 2) using the Terraform Module called ec-2 instance. In the output I want to receive IDs of provisioned EC2 instances.

locals {
  app = {
    instance1 = {
      name = "instance1"
      az = "eu-west-1a"
    }
    instance2 = {
      name = "instance2"
      az = "eu-west-1c"
    }
  }
}

module "ec2-instance" {
  for_each = local.app
  source  = "terraform-aws-modules/ec2-instance/aws"
  version = "5.5.0"
  name = each.value.name
  availability_zone = each.value.az
}

output "ids_of_instances" {
   value = module.ec2-instance[*].id
 }

I’m getting an error:

 Error: Unsupported attribute
│
│   on main.tf line 96, in output "ids_of_instances":
│   96:   value = module.ec2-instance[*].id
│
│ This object does not have an attribute named "id".

Obviously I can try to use multiple outputs blocks like:

output "instance1" { 
  value = module.ec2-instance["instance1"].id
}

output "instance1" { 
  value = module.ec2-instance["instance2"].id
}

but the goal is to get this output from 1 single block. Any thoughts?

Tags:

2

Answers


  1. 0

    I believe the for_each will create a map of your modules. The documentation for the splat expression says that you should use a for expression with maps, instead of a splat expression.

    I’m not at a place where I can test this right now, I believe that would look like this:

    output "ids_of_instances" {
    value = [for instance in module.ec2-instance : instance.id]
}
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  2. 0

    Since the module is created with for_each, you can use the built-in values function to get all the values of the outputs you want:

    output "ids_of_instances" {
   value = values(module.ec2-instance)[*].id
 }
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