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Terraform & Infrastructure as Code Interview Questions Interview Guide

10 interview questions with sample answers

12-15 hours
Prep Time
$150K-$230K
Salary
10
Questions

About This Role

Prepare for roles using Terraform: IaC best practices, modules, state management, multi-environment deployments, and cloud infrastructure automation.

Behavioral Questions (2)

Q1

Tell me about a large infrastructure project you managed with Terraform. How did you organize it?

Sample Answer:

Managed 50-VM cluster deployment. Organized: root module for orchestration, modules for compute/networking/storage. Used workspaces for dev/staging/prod. Implemented variable overrides per environment.

Q2

How have you handled Terraform state in a team environment?

Sample Answer:

Started with local state, quickly moved to S3 remote state with DynamoDB locking. Implemented state backup, restricted access via IAM. No state conflicts since migration.

Technical & Situational Questions (4)

Q3

How do you structure Terraform modules for reusability?

Sample Answer:

Separate variables.tf (inputs), main.tf (logic), outputs.tf. Create modules for each resource type. Document with variables and outputs. Version modules in separate repos.

Q4

Explain Terraform state. What are risks and how do you mitigate them?

Sample Answer:

State maps code to resources. Risks: loss (implement backup), corruption (enable versioning), exposure (restrict access). Mitigate: remote state with locking, RBAC, encryption, version control.

Q5

How would you implement multi-environment (dev/staging/prod) with Terraform?

Sample Answer:

Use workspaces or separate directories per environment. Override variables using terraform.tfvars per environment. Share common modules. Use remote state for prod.

Q6

What strategies do you use for zero-downtime deployments with Terraform?

Sample Answer:

Use ASGs with rolling updates, blue-green deployments, traffic-splitting. Plan carefully, test in staging. Use lifecycle rules to prevent resource recreation.

FAQ

When should I split infrastructure into modules?
Create modules for: resources shared across projects, complex resources with variables. Avoid over-modularization. Start flat, refactor when complexity grows.
How do I rollback failed Terraform changes?
Terraform destroy or manual rollback using terraform state rm. Prevent with careful planning, staging validation. Keep manual documentation of changes.
Can Terraform manage existing infrastructure (import)?
Yes, terraform import maps existing resources to code. Not automatic; requires manual code writing. Useful for adopting IaC for existing infrastructure.
What's the difference between Terraform and CloudFormation?
Terraform: multi-cloud, declarative, larger community. CloudFormation: AWS-native, tighter integration. Choose Terraform for multi-cloud, CloudFormation if AWS-only.

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Last updated on 2026-03-07