inputs Attribute

Terragrunt’s inputs attribute is essential for passing configuration values into Terraform modules. By specifying key-value pairs, you can easily feed outputs from dependencies or define custom variables for your current module, keeping your infrastructure code modular and maintainable.

How inputs Works

In Terragrunt, the inputs block maps each variable name to the desired value:

• You can reference outputs from other modules using Terragrunt’s dependency blocks.
• Values defined here correspond directly to the Terraform variables declared in variables.tf.

Key Benefits

• Modularization: Share data between modules without duplicating configuration.
• Reusability: Centralize common settings (e.g., VPC CIDR ranges) across environments.
• Maintainability: Change inputs in a single Terragrunt file rather than multiple Terraform modules.

Important Considerations

Example: AWS VPC Module

Below is a Terragrunt configuration that passes the VPC name and cidr into the Terraform AWS VPC module:

terraform {
  source = "tfr://terraform-aws-modules/vpc/aws//?version=5.8.1"
}

include "root" {
  path   = find_in_parent_folders()
  expose = true
}

inputs = {
  name = "KodeKloud-VPC"
  cidr = "10.100.0.0/16"
}

Input Parameters Table

Links and References

• Terragrunt Inputs Documentation
• Terraform AWS VPC Module
• Terragrunt Official Site