Next you’ll define, use, and customize modules in your Terraform projects. Modules also offer the benefit that definitions only need modification in one place, which will then be propagated through the rest of the infrastructure. Developers use modules for larger projects because of the significant advantages in avoiding code duplication. With their ability for customization, modules are the building element of complexly structured projects. Packaging a single resource as a module can be superfluous and gradually removes the simplicity of the overall architecture.įor small development and test projects, incorporating modules is not necessary because they do not bring much improvement in those cases. It is useful to create modules from your resource schemes when you find yourself repeating them with infrequent customizations. In order to retain a clean separation between modules, always architect them to have a single purpose and make sure they never contain submodules. Modules are typically stored in a central folder at the root of the project, each in its respective subfolder underneath. They are self-contained, bundling only the resources, variables, and providers they need. In this section, you’ll learn what benefits modules bring, where they are usually placed in the project, and how they should be structured.Ĭustom Terraform modules are created to encapsulate connected components that are used and deployed together frequently in bigger projects. Note: This tutorial has specifically been tested with Terraform 1.1.3. You can follow the How To Manage Infrastructure Data with Terraform Outputs tutorial to learn about them. Familiarity with Terraform outputs and their usage.For more information, see the How To Improve Flexibility Using Terraform Variables, Dependencies, and Conditionals tutorial. Familiarity with HCL data types and loops.During Step 2, do not include the pvt_key variable and the SSH key resource. Complete Step 1 and Step 2 of the How To Use Terraform with DigitalOcean tutorial, and be sure to name the project folder terraform-modules, instead of loadbalance. Terraform installed on your local machine and a project set up with the DO provider.You can find instructions in the DigitalOcean product document, How to Create a Personal Access Token. A DigitalOcean Personal Access Token, which you can create via the DigitalOcean control panel.You’ll also use the for_each and count looping features of the Hashicorp Configuration Language (HCL) to deploy multiple customized instances of the module at the same time. In this tutorial, you’ll create a Terraform module that will set up multiple Droplets behind a Load Balancer for redundancy. Developers can use and customize them using inputs like the modules you create, but their source code is stored in and pulled from the cloud. Aside from creating your own custom modules, you can also use the pre-made modules published publicly at the Terraform Registry. You can customize module instances using input variables you define as well as extract information from them using outputs. You can reuse them later with possible customizations, without repeating the resource definitions each time you need them, which is beneficial to large and complexly structured projects. Terraform modules allow you to group distinct resources of your infrastructure into a single, unified resource. The author selected the Free and Open Source Fund to receive a donation as part of the Write for DOnations program.
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