terraform/website/docs/configuration-0-11/modules.html.md

layout	page_title	sidebar_current	description
docs	Modules - 0.11 Configuration Language	docs-conf-old-modules	Modules are used in Terraform to modularize and encapsulate groups of resources in your infrastructure. For more information on modules, see the dedicated modules section.

Module

-> Note: This page is about Terraform 0.11 and earlier. For Terraform 0.12 and later, see Configuration Language: Modules.

Modules are used in Terraform to modularize and encapsulate groups of resources in your infrastructure. For more information on modules, see the dedicated modules section.

This page assumes you're familiar with the configuration syntax already.

Example

module "consul" {
  source  = "hashicorp/consul/aws"
  servers = 5
}

Description

A module block instructs Terraform to create an instance of a module, and in turn to instantiate any resources defined within it.

The name given in the block header is used to reference the particular module instance from expressions within the calling module, and to refer to the module on the command line. It has no meaning outside of a particular Terraform configuration.

Within the block body is the configuration for the module. All attributes within the block must correspond to variables within the module, with the exception of the following which Terraform treats as special:

• source - (Required) A module source string specifying the location of the child module source code.

• version - (Optional) A version constraint string that specifies which versions of the referenced module are acceptable. The newest version matching the constraint will be used. version is supported only for modules retrieved from module registries.

• providers - (Optional) A map whose keys are provider configuration names that are expected by child module and whose values are corresponding provider names in the calling module. This allows provider configurations to be passed explicitly to child modules. If not specified, the child module inherits all of the default (un-aliased) provider configurations from the calling module.