Quick Answer
The correct answer is to accept the recreation; it is required for this attribute. When you change the `ami` of an `aws_instance`, Terraform must destroy and recreate the resource because the AMI is a fundamental, immutable property of an EC2 instance—there is no in-place update mechanism in the AWS API to swap the underlying operating system or root volume of a running instance. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of resource lifecycle and the concept of "forces recreation" attributes, which are clearly marked in the provider documentation. A common trap is assuming `create_before_destroy` avoids recreation, but it only changes the order of operations—the old instance still gets destroyed. Remember the memory tip: "AMI = Always Must be Immutable"—if the AMI changes, the instance must be replaced.
This TF-003 practice question tests your understanding of read, generate and modify configuration. 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.
An operator modifies a Terraform configuration to change the `ami` attribute of an `aws_instance` resource. When they run `terraform plan`, they see that the resource will be destroyed and recreated. They want to avoid the recreation and instead update the instance in-place. What is the best approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Add `create_before_destroy` lifecycle rule
Why wrong: still destroys, just creates new first
Accept the recreation; it is required for this attribute
AMI changes always require recreation for EC2
Use `ignore_changes` in lifecycle to ignore AMI changes
Why wrong: this would prevent the AMI change from being applied
Add `prevent_destroy` lifecycle rule
Why wrong: this would block any destroy operation
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Accept the recreation; it is required for this attribute
Option C is correct because changing the AMI of an EC2 instance forces recreation; there is no in-place update. Option A is wrong because `create_before_destroy` still destroys the old. Option B is wrong because ignoring changes to AMI would prevent updates. Option D is wrong because `prevent_destroy` would block the operation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Add `create_before_destroy` lifecycle rule
Why it's wrong here
still destroys, just creates new first
Accept the recreation; it is required for this attribute
Why this is correct
AMI changes always require recreation for EC2
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Use `ignore_changes` in lifecycle to ignore AMI changes
Why it's wrong here
this would prevent the AMI change from being applied
Add `prevent_destroy` lifecycle rule
Why it's wrong here
this would block any destroy operation
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read, generate and modify configuration — study guide chapter
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Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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FAQ
Read, generate and modify configuration — This question tests Read, generate and modify configuration — Read the scenario before looking for a memorised answer..
The correct answer is: Accept the recreation; it is required for this attribute — Option C is correct because changing the AMI of an EC2 instance forces recreation; there is no in-place update. Option A is wrong because `create_before_destroy` still destroys the old. Option B is wrong because ignoring changes to AMI would prevent updates. Option D is wrong because `prevent_destroy` would block the operation.
Identify which TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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