- A
The rollback deployment uses an AppSpec file that references a lifecycle hook that does not exist in the current environment.
Rollback deploys the previous revision; if that revision's AppSpec references a non-existent resource, the rollback fails.
- B
The target group for the load balancer is not properly configured.
Why wrong: Target group misconfiguration would cause health check failures but not necessarily rollback failure.
- C
The Amazon S3 bucket containing the deployment artifacts is missing.
Why wrong: A missing S3 bucket would cause the original deployment to fail, not the rollback.
- D
The Auto Scaling group does not have sufficient capacity to run the rollback.
Why wrong: Insufficient capacity would affect any deployment, but rollback uses the same capacity.
Why CodeDeploy Rollback Fails: Previous Revision's AppSpec References Missing Hook
This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: codeDeploy Rollback. 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 company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails, and the rollback is triggered. However, the rollback also fails. What is a likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The rollback deployment uses an AppSpec file that references a lifecycle hook that does not exist in the current environment.
Option A is correct because a rollback in AWS CodeDeploy uses the previous version's AppSpec file. If that file references a lifecycle hook (e.g., an AfterInstall script) that no longer exists in the current environment—such as a deleted script file or missing directory—the rollback will fail. Option B is incorrect: a misconfigured target group would affect load balancing but does not cause a rollback deployment to fail. Option C is incorrect: if the S3 bucket were missing, the original deployment would have failed, and rollback would use the previously deployed artifact (still available), not the missing bucket. Option D is incorrect: insufficient capacity would prevent the original deployment or rollback from starting, but the scenario describes a deployment that succeeded initially and then rolled back, so capacity was sufficient.
Key principle: CodeDeploy Rollback
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The rollback deployment uses an AppSpec file that references a lifecycle hook that does not exist in the current environment.
Why this is correct
Rollback deploys the previous revision; if that revision's AppSpec references a non-existent resource, the rollback fails.
Related concept
CodeDeploy Rollback
- ✗
The target group for the load balancer is not properly configured.
Why it's wrong here
Target group misconfiguration would cause health check failures but not necessarily rollback failure.
- ✗
The Amazon S3 bucket containing the deployment artifacts is missing.
Why it's wrong here
A missing S3 bucket would cause the original deployment to fail, not the rollback.
- ✗
The Auto Scaling group does not have sufficient capacity to run the rollback.
Why it's wrong here
Insufficient capacity would affect any deployment, but rollback uses the same capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is assuming rollback always succeeds if the original deployment did. Rollback can fail if the previous version's AppSpec file references resources (e.g., lifecycle hooks) that have been removed or changed.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CodeDeploy Rollback
- AppSpec Lifecycle Hooks
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
CodeDeploy Rollback
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review codeDeploy Rollback, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — CodeDeploy Rollback.
What is the correct answer to this question?
The correct answer is: The rollback deployment uses an AppSpec file that references a lifecycle hook that does not exist in the current environment. — Option A is correct because a rollback in AWS CodeDeploy uses the previous version's AppSpec file. If that file references a lifecycle hook (e.g., an AfterInstall script) that no longer exists in the current environment—such as a deleted script file or missing directory—the rollback will fail. Option B is incorrect: a misconfigured target group would affect load balancing but does not cause a rollback deployment to fail. Option C is incorrect: if the S3 bucket were missing, the original deployment would have failed, and rollback would use the previously deployed artifact (still available), not the missing bucket. Option D is incorrect: insufficient capacity would prevent the original deployment or rollback from starting, but the scenario describes a deployment that succeeded initially and then rolled back, so capacity was sufficient.
What should I do if I get this DVA-C02 question wrong?
Review codeDeploy Rollback, then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CodeDeploy Rollback
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Last reviewed: Jun 20, 2026
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