How to Dynamically Create a Key Vault Identifier Map in Terraform

Learn how to output a map in Terraform with resource identifiers as values, leveraging the `for_each` function in your infrastructure management.
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Creating a Dynamic Map of Azure Key Vaults in Terraform

When working with Terraform, handling multiple resources dynamically can seem daunting. One common scenario that many developers encounter is the need to create multiple Azure Key Vaults based on a predefined list and subsequently generate a mapping of application names to their respective Key Vault IDs. If you've found yourself in a similar predicament, you are not alone! In this guide, we will explore how to accomplish this using Terraform's powerful functionality.

The Problem

Imagine you have a list of application names, such as ["app1", "app2", "app3"], and you are tasked with creating a separate Key Vault for each application. The goal is to easily map the application names to the IDs of the Key Vaults created for them.

After following a resource creation script, like the one below:

[[See Video to Reveal this Text or Code Snippet]]

You've created the Key Vaults, but the next question arises: How do I create a map with the application names as keys and the corresponding Key Vault IDs as values?

The Solution

Indeed, Terraform provides a straightforward solution thanks to its powerful for_each functionality. Let's break down the steps to create this map efficiently.

Step 1: Understand the Output Syntax

Since you're using the for_each loop to create your Key Vault resources, each instance of the resource can be easily referenced. In Terraform, when you use for_each, the keys you provide become accessible as you build your outputs.

Step 2: Crafting the Output

To achieve the desired output map, you will define an output value that utilizes the for expression to iterate over the created Key Vaults. Here’s how to structure your output block:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

output Block: This defines what you want your Terraform output to be.

for Expression: This goes through each created Key Vault where:

k represents the keys (app1, app2, app3).

v represents the values (the Key Vault resources).

Conclusion

By leveraging Terraform’s for_each and its output capabilities, you can efficiently manage and reference multiple resources without complications. This approach not only simplifies your infrastructure deployment process but also enhances the readability and maintenance of your Terraform configuration files.

Now, you have an elegant solution to dynamically generate a map connecting application names with their respective Key Vault IDs! This will enable you to manage your Azure resources more effectively and make your Terraform scripts cleaner.

If you have any questions or run into issues implementing this, feel free to reach out or leave a comment below.