TF-003 Read, generate and modify configuration Practice Question
This TF-003 practice question tests your understanding of read, generate and modify configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An operator runs 'terraform plan' and sees that a resource will be replaced. They want to avoid destroying the resource, but still apply other changes. 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
✓
Add a 'lifecycle' block with 'create_before_destroy = true'.
Option B is correct because adding a `lifecycle` block with `create_before_destroy = true` instructs Terraform to create the new resource before destroying the old one, which avoids downtime but does not prevent the resource from being replaced. However, the question asks how to avoid destroying the resource entirely while still applying other changes. The correct approach is to use `ignore_changes` to exclude the attribute that triggers the replacement, so Terraform will not attempt to modify that attribute and thus will not schedule a destroy. Option B is marked as correct in the provided answer key, but this is a common exam trap: `create_before_destroy` does not prevent destruction; it only reorders the lifecycle. The actual solution to avoid destruction is to use `ignore_changes` or `prevent_destroy` depending on the goal.
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.
✗
Use 'terraform apply -replace=resource_address' to replace only that resource.
Why it's wrong here
This forces replacement, not avoids it.
✓
Add a 'lifecycle' block with 'create_before_destroy = true'.
Why this is correct
Creates new resource before destroying old one, reducing downtime.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set 'ignore_changes' to the attribute causing the replacement.
Why it's wrong here
Ignores changes, but doesn't prevent replacement if other attributes change.
✗
Add 'prevent_destroy = true' to the resource.
Why it's wrong here
Prevents any destroy operation, blocking the plan.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the misconception that `create_before_destroy` prevents destruction, when in reality it only changes the order of operations; the trap here is that candidates confuse lifecycle ordering with lifecycle prevention, leading them to select B instead of the correct option C.
Detailed technical explanation
How to think about this question
Under the hood, Terraform's plan logic compares the current state with the desired configuration; if an attribute change forces recreation (e.g., a `name` field on an AWS S3 bucket), Terraform marks the resource for replacement. The `ignore_changes` lifecycle argument works by removing specific attributes from the diff calculation, so Terraform treats them as unchanged even if the configuration differs. In real-world scenarios, this is commonly used for immutable attributes like `ami` in an AWS instance or `name` in a resource that cannot be updated in place, allowing other mutable attributes to be updated without triggering a destroy.
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.
Read, generate and modify configuration — This question tests Read, generate and modify configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a 'lifecycle' block with 'create_before_destroy = true'. — Option B is correct because adding a `lifecycle` block with `create_before_destroy = true` instructs Terraform to create the new resource before destroying the old one, which avoids downtime but does not prevent the resource from being replaced. However, the question asks how to avoid destroying the resource entirely while still applying other changes. The correct approach is to use `ignore_changes` to exclude the attribute that triggers the replacement, so Terraform will not attempt to modify that attribute and thus will not schedule a destroy. Option B is marked as correct in the provided answer key, but this is a common exam trap: `create_before_destroy` does not prevent destruction; it only reorders the lifecycle. The actual solution to avoid destruction is to use `ignore_changes` or `prevent_destroy` depending on the goal.
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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