Implementing Infrastructure as Code (IaC) with Terraform: Scaling Infrastructure with Terraform Modules

• Calling a Module

To use the module in your infrastructure, you can call it from your Terraform configuration like so:

module "web" {
  source = "./modules/ec2_instance"

  // Pass arguments here
}        

Terraform will manage five EC2 instances in this configuration as defined in the "ec2_instance" module. The source attribute here points to the relative path of the module.

• Managing Module Versions

Just like software, modules can be versioned. When modules are versioned, you can pin your configuration to a specific version and avoid unexpected changes.

• Utilising Public Modules

In addition to creating your modules, you can also use public modules from the Terraform Registry, a collection of modules written and maintained by the community. This can significantly speed up your configuration writing process and ensure you follow best practices.

Congratulations! Learning about modules has taken your Terraform skills to the next level. You can scale your infrastructure efficiently and maintainably by making the most of modules.

Stay tuned for our next post, where we'll dive into managing Terraform state, an essential aspect of working with Terraform at scale.