08-terraform-modules

Terraform Modules

Module Overview

Reusable code or functions are essential in effective coding. This holds true for infrastructure code as well. With Terraform you can package up a configuration into configuration modules for re-use.

In this module, you will see how to re-use the hello world configuration as a Terraform module.

Create a Terraform module

To use the hello world configuration as a module, navigate back to the root of terraform directory that you created earlier in this workshop. Create a new directory named hello-world-from-module.

mkdir hello-world-from-module
cd hello-world-from-module

Create a file named main.tf.

touch main.tf

Copy in the following configuration.

Notice here that instead of defining things like the container image, memory, and cpu requests, you are only providing the location of the module, a resource group name, and a dns prefix. These values will be passed as input variables to the hello world configuration.

module "hello-world" {
    source = "../hello-world"
    resource_group = "hello-world-module"
    dns-prefix = "hello-world-module"
}

Run the terraform init command to initialize the directory.

terraform init

Create a terraform plan.

terraform plan --out plan.out

Apply the plan.

terraform apply plan.out

When complete, you will have another instance of the hello world application.

Next Module

In the next module, you will learn about testing your Terraform configurations.

Module 9: Testing Terraform