- A
Re-run the old 'Setup' recipe that installs the previous PHP version on the layer.
Correct. Re-running the old 'Setup' recipe that installs the previous PHP version will revert the instances quickly and with minimal downtime, assuming the recipe is idempotent.
- B
Create a new AMI with the old PHP version, launch new instances, and terminate the old ones.
Why wrong: Incorrect. Creating a new AMI with the old PHP version and launching new instances is time-consuming and may cause extended downtime while instances are replaced.
- C
Use the OpsWorks 'Rollback' feature to revert the stack to a previous state.
Why wrong: Incorrect. OpsWorks does not have a native 'Rollback' feature for stacks; you must re-run the previous recipes to revert changes.
- D
Manually SSH into each instance and downgrade the PHP package, then restart the web server.
Why wrong: Incorrect. Manually SSHing into each instance is slow, error-prone, and not automated, which is not suitable for a production environment with Auto Scaling groups.
DOP-C02 AWS OpsWorks Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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. A key principle to apply: aWS OpsWorks. 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 is using AWS OpsWorks for configuration management. They have a stack with a PHP application layer and a MySQL layer. The DevOps team needs to update the PHP version across all instances. They create a custom Chef recipe that updates the PHP package and add it to the lifecycle events. After running the 'Setup' lifecycle event on the layer, the instances are updated but the application stops working because the new PHP version is incompatible with some custom PHP extensions. The team needs to roll back the PHP version to the previous one quickly and minimize downtime. The instances are in an Auto Scaling group with a desired count of 4. What should the team do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Re-run the old 'Setup' recipe that installs the previous PHP version on the layer.
Option A is correct because re-running the old 'Setup' recipe on the layer will revert the PHP version to its previous state, leveraging Chef's idempotency and the OpsWorks lifecycle event system. This approach minimizes downtime as it only re-applies the old configuration without reprovisioning instances. Option B is incorrect because creating a new AMI and launching new instances takes time and may cause prolonged downtime. Option C is incorrect because OpsWorks does not have a built-in 'Rollback' feature; you must use recipes to revert changes. Option D is incorrect because manually SSHing into each instance is error-prone, not scalable, and not recommended for production environments.
Key principle: AWS OpsWorks
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Re-run the old 'Setup' recipe that installs the previous PHP version on the layer.
Why this is correct
Correct. Re-running the old 'Setup' recipe that installs the previous PHP version will revert the instances quickly and with minimal downtime, assuming the recipe is idempotent.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
AWS OpsWorks
- ✗
Create a new AMI with the old PHP version, launch new instances, and terminate the old ones.
Why it's wrong here
Incorrect. Creating a new AMI with the old PHP version and launching new instances is time-consuming and may cause extended downtime while instances are replaced.
- ✗
Use the OpsWorks 'Rollback' feature to revert the stack to a previous state.
Why it's wrong here
Incorrect. OpsWorks does not have a native 'Rollback' feature for stacks; you must re-run the previous recipes to revert changes.
- ✗
Manually SSH into each instance and downgrade the PHP package, then restart the web server.
Why it's wrong here
Incorrect. Manually SSHing into each instance is slow, error-prone, and not automated, which is not suitable for a production environment with Auto Scaling groups.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates might assume that OpsWorks has a native rollback feature for stacks, but it does not. The correct approach is to re-run the previous recipe via the appropriate lifecycle event.
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
- AWS OpsWorks
- Lifecycle Events
- Chef Recipe Idempotency
- Rollback via Recipe
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
AWS OpsWorks
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. AWS OpsWorks Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
Review aWS OpsWorks, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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SDLC Automation — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — AWS OpsWorks.
What is the correct answer to this question?
The correct answer is: Re-run the old 'Setup' recipe that installs the previous PHP version on the layer. — Option A is correct because re-running the old 'Setup' recipe on the layer will revert the PHP version to its previous state, leveraging Chef's idempotency and the OpsWorks lifecycle event system. This approach minimizes downtime as it only re-applies the old configuration without reprovisioning instances. Option B is incorrect because creating a new AMI and launching new instances takes time and may cause prolonged downtime. Option C is incorrect because OpsWorks does not have a built-in 'Rollback' feature; you must use recipes to revert changes. Option D is incorrect because manually SSHing into each instance is error-prone, not scalable, and not recommended for production environments.
What should I do if I get this DOP-C02 question wrong?
Review aWS OpsWorks, then practise related DOP-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
AWS OpsWorks
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Last reviewed: Jun 20, 2026
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