Hands-on: Try the Reuse Configuration with Modules collection on HashiCorp Learn.
Modules are containers for multiple resources that are used together. A module consists of a collection of .tf and/or .tf.json files kept together in a directory.
Modules are the main way to package and reuse resource configurations with Terraform.
Every Terraform configuration has at least one module, known as its root module, which consists of the resources defined in the .tf files in the main working directory.
A Terraform module (usually the root module of a configuration) can call other modules to include their resources into the configuration. A module that has been called by another module is often referred to as a child module.
Child modules can be called multiple times within the same configuration, and multiple configurations can use the same child module.
In addition to modules from the local filesystem, Terraform can load modules from a public or private registry. This makes it possible to publish modules for others to use, and to use modules that others have published.
The Terraform Registry hosts a broad collection of publicly available Terraform modules for configuring many kinds of common infrastructure. These modules are free to use, and Terraform can download them automatically if you specify the appropriate source and version in a module call block.
Also, members of your organization might produce modules specifically crafted for your own infrastructure needs. Terraform Cloud and Terraform Enterprise both include a private module registry for sharing modules internally within your organization.
Module Blocks documents the syntax for calling a child module from a parent module, including meta-arguments like for_each.
Module Sources documents what kinds of paths, addresses, and URIs can be used in the source argument of a module block.
The Meta-Arguments section documents special arguments that can be used with every module, including providers, depends_on, count, and for_each.
For information about developing reusable modules, see Module Development.
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