As cloud technology continues marching onwards, more and more developers are embracing the power of Terraform to automate their infrastructure. And why wouldn’t they? With its clear and concise syntax, Terraform is the perfect tool for crafting fully automated infrastructure stacks.

And with the power of terraform modules, developers can re-use code and simplify their deployments more effectively than ever before. With this article, we will discuss the ins and outs of Terraform modules and how they can help streamline your development process significantly.

What is a Terraform Module?

Terraform Module is a bit of code written in the HCL language that represents a specific and repeatable configuration that can be used to build infrastructure. These modules simplify the building and deployment process by enabling developers to gather multiple resources together into a single unit, ensuring consistent infrastructure every time.

Terraform modules help you save time and money by allowing developers to create infrastructure stacks that can be used repeatedly, whether to create test environments or complex production environments. You can even use modules to replicate pre-packaged, customizable infrastructure.

Don’t Repeat Yourself (DRY)

Modular programming is based on the principle of Don’t Repeat Yourself (DRY) – or simply put, do not repeat the same code in multiple places. When you adhere to this principle, you make your code more efficient, easier to debug, and easier to maintain. DRY code is organized, keeping your codebase concise, consistent, and scalable.

Terraform modules embrace this concept with gusto, so you can group all your configuration into a single module, making your infrastructure management stress-free. By combining individual components into concise modules, you need only to apply the modules once to create and maintain that infrastructure, unlike the traditional process of individual resources configuration.

The Benefits of Terraform Modules

Terraform modules are beneficial to both developers and infrastructure engineers alike. By modularizing your Terraform code, you can enjoy the following benefits:

  1. Code reusability: Modules can be saved, adapted, and used in multiple environments or projects, allowing for quicker development iterations.

  2. Simplified management and maintenance: One module often does the work of multiple components, keeping everything neat and organized while eliminating the need to do any manual debugging.

  3. Code predictability: Modules can be abstracted to their most critical components, eliminating manual configuration risks and reducing human error.

  4. Efficient security reviews: More streamlined and consistent application of configuration components in secure areas.

  5. Scaling made easier: Once modules are composed correctly, scaling infrastructure products becomes considerably more straightforward.

How to Use Terraform Modules

Now that you know what Terraform modules are and their benefits, let’s walk through how to use them. Whether creating a new module or reusing an existing one, this simple six-step process should guide you through module building.

  1. Define input variables: Start by defining input variables to be passed to your module, such as subnet isolation or instance type. This way, you can reuse components as deep into the network as possible.

  2. Define output values: Returned values should define the information passed through the module to other sections of the Terraform code.

  3. Write your code: Put your components together as Terraform module code.

  4. Test the module code: Using the terraform-validate command, test the syntax of the module code to make sure it’s correct.

  5. Publish your module: Begin by deciding on a storage solution for your modules, like a private Git repository or your local Terraform registry.

  6. Use your module: That’s it! Now use your new module as needed to deploy infrastructure and manage updates.


In conclusion, Terraform modules are an excellent way to reuse configuration code and simplify deployment, whether working on developing, testing, or production projects. By using Terraform modules, you can reduce duplication of effort, eliminate redundancies in your code, and increase your development speed exponentially.

We hope this guide has been useful and inspired you to explore the world of Terraform modules more fully. With the right tools, you can take your cloud infrastructure deployment to the next level and open up new possibilities for your work.

So, embrace Terraform modules and take the first step in automating your development process today!

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