Fixing interpolation errors

Terraform interpolation is a feature provided by Terraform that allows you to embed expressions within strings or configuration blocks. These expressions are evaluated at runtime and can contain references to variables, data sources, resources, functions, and other Terraform constructs. Interpolation enables you to dynamically generate values, compute derived values, and perform various transformations within your Terraform configurations.

The syntax for interpolation in Terraform is ${...}. Inside the interpolation syntax, you can use a wide range of expressions, including variable references, resource attributes, function calls, and mathematical operations.

One of the errors encountered when applying Terraform configuration is the improper use of interpolation.

In this recipe, we’ll illustrate an example of an interpolation error and how to resolve it.

Let’s get started!

Getting ready

In this recipe, we have an existing...