TF-003 Use the core Terraform workflow Practice Question
This TF-003 practice question tests your understanding of use the core terraform workflow. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is reviewing a terraform plan output and sees that a resource of type "aws_instance" with name "web" will be updated. The developer expected no changes because the configuration hasn't been modified. The instance was manually resized in the AWS console by another team. The developer wants to reconcile the state without destroying the instance. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run terraform apply -refresh-only to update the state to match reality.
Option A is correct because `terraform apply -refresh-only` updates the Terraform state to match the actual infrastructure without making any configuration changes. This command reads the current state of the `aws_instance.web` resource from AWS and writes it to the state file, reconciling the drift caused by the manual resize. It does not destroy or recreate the instance, preserving the existing resource.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Run terraform apply -refresh-only to update the state to match reality.
Why this is correct
Refresh-only syncs state with real-world infrastructure without making changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run terraform state rm aws_instance.web and then terraform import.
Why it's wrong here
While this works, it is more complex and risks state loss if not done correctly.
✗
Manually edit the state file to match the instance attributes.
Why it's wrong here
Editing state files directly is dangerous and unsupported.
✗
Run terraform apply with -target=aws_instance.web to update only that resource.
Why it's wrong here
This would apply the configuration, which might change the instance back to the old size.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between `terraform apply -refresh-only` and `terraform apply` with `-target`, where candidates mistakenly think targeting a resource will only refresh it, but in reality `-target` still applies configuration changes and can cause updates or destruction.
Detailed technical explanation
How to think about this question
The `-refresh-only` flag was introduced in Terraform 0.15.4 and is specifically designed for drift detection and state reconciliation without side effects. Under the hood, it performs a full refresh of all resources in the state by calling the provider's `Read` function for each resource, then writes the updated state without generating an execution plan for changes. This is particularly useful in team environments where manual changes via consoles or scripts are common, as it avoids the risk of accidental destruction or modification during a standard `apply`.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the TF-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Use the core Terraform workflow — This question tests Use the core Terraform workflow — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run terraform apply -refresh-only to update the state to match reality. — Option A is correct because `terraform apply -refresh-only` updates the Terraform state to match the actual infrastructure without making any configuration changes. This command reads the current state of the `aws_instance.web` resource from AWS and writes it to the state file, reconciling the drift caused by the manual resize. It does not destroy or recreate the instance, preserving the existing resource.
What should I do if I get this TF-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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