Troubleshooting a Terraform Variable Interpolation Error

30 minutes
  • 2 Learning Objectives

About this Hands-on Lab

Hey there, Gurus! Welcome to the lab! This lab will demonstrate how to troubleshoot a Terraform variable interpolation error. We will attempt to go through the different stages of deployment to try and deploy our configuration and work through the interpolation error until we have successfully deployed our resources.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Format Your Terraform Configurations

1) In the terminal, once logged into your instance, change to the terraform directory.
2) In the terraform directory, edit the file and add in your ami ,subnet_id, and vpc from the resource_ids.txt file.
3) Run the terraform fmt command.

Fix the Interpolation Error

1) After running the terraform fmt command, you should get an error. Read the error and go to the line in the file where the error is.
2) Fix the syntax error for the tag name variable.
3) Run terraform fmt command. If the error is fixed, then move on to the next stage in your deployment until all of your resources are deployed successfully.
4) Once your resources are deployed without any errors, the lab is then complete.

Additional Resources

Here is the scenario:

You are an admin who supports one of the largest online comic book retailers in the world. You are one of a handful of admins who have been assigned to use Terraform to manage the company's cloud deployments. You are being asked to create a new dev environment to test out new features of the company's site. You have your configuration that will create one of the app servers for the site. You have started to get things ready and you are ready to use the code to deploy your resources, but you have run into a variable interpolation error. Fix the error and successfully deploy your app server in AWS using Terraform to complete this lab.

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Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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