End of support notice: On October 7, 2026, AWS will end support for AWS Proton. After October 7, 2026, you will no longer be able to access the AWS Proton console or AWS Proton resources. Your deployed infrastructure will remain intact. For more information, see [AWS Proton Service Deprecation and Migration Guide](https://docs.aws.amazon.com/proton/latest/userguide/proton-end-of-support.html).

# Terraform infrastructure as code (IaC) file parameter details and examples
<a name="env-parameters-tform"></a>

You can include Terraform input variables in `variable.tf` files in your template bundle. You can also create a schema to create AWS Proton managed variables. AWS Proton creates variable `.tf files` from your schema file. For more information, see [Terraform IaC files](ag-infrastructure-tmp-files-terraform.md).

To reference your schema defined AWS Proton variables in your infrastructure `.tf files`, you use the AWS Proton namespaces shown in the *Parameters and namespaces for Terraform IaC* table. For example, you can use `var.environment.inputs.vpc_cidr`. Inside quotation marks, surround these variables with single brackets and add a dollar sign in front of the first brace (for example, `“${var.environment.inputs.vpc_cidr}”`).

The following example shows how to use namespaces to include AWS Proton parameters in an environment `.tf file`.

```
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
  // This tells terraform to store the state file in s3 at the location
  // s3://terraform-state-bucket/tf-os-sample/terraform.tfstate
  backend "s3" {
    bucket = "terraform-state-bucket"
    key    = "tf-os-sample/terraform.tfstate"
    region = "us-east-1"
  }
}

// Configure the AWS Provider
provider "aws" {
  region = "us-east-1"
  default_tags {
    tags = var.proton_tags
  }
}

resource "aws_ssm_parameter" "my_ssm_parameter" {
  name  = "my_ssm_parameter"
  type  = "String"
  // Use the Proton environment.inputs. namespace
  value = var.environment.inputs.ssm_parameter_value
}
```