Terraform Module Block Syntax

External

• https://www.terraform.io/docs/configuration/modules.html
• https://www.terraform.io/docs/modules/index.html

Internal

• Hashicorp Configuration Language

Overview

TODO: this section must be expanded based on https://www.terraform.io/docs/configuration/modules.html and https://www.terraform.io/docs/modules/index.html

After adding, removing, or modifying module blocks, terraform init must be re-run to allow Terraform the opportunity to adjust the installed modules. By default this command will not upgrade an already-installed module; use the -upgrade option to instead upgrade to the newest available version.

Example

module "some-module" {

  source = "terraform-aws-modules/eks/aws"
  version = "~> 9.0"

  cluster_name = local.cluster_name
  vpc_id = var.aws_vpc_id

  ...

  tags = {
    Environment = var.environment_name
  }
}

Arguments

source

The source argument is required. It is a meta-argument defined by the Terraform CLI. Its value is either the path to the local directory that contains the dependency module's configuration files or a remote module source that Terraform should download and use. This value must be a literal string with no template sequences; arbitrary expressions are not allowed. For more details see:

Module Sources

How to Specify a Remote Module

The syntax specified below (no protocol qualifier) implies that the module path is relative to the Terraform Registry URL, specifically https://registry.terraform.io/v1/modules/. This is obvious if TF_LOG environment variable is set to TRACE.

module "..." {

  source = "terraform-aws-modules/eks/aws"
  ...
}

version

https://www.terraform.io/docs/configuration/modules.html#module-versions

Constraint on the dependency module version.