The answer is to re-run the old Setup recipe that installs the previous PHP version on the layer. This is correct because AWS OpsWorks treats the Setup lifecycle event as a deterministic configuration script; re-running a prior Setup recipe effectively performs a rollback recipe by reapplying the known-good state to all existing instances without destroying them. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that OpsWorks rollback does not require instance replacement or Auto Scaling group manipulation—it leverages the existing lifecycle event system to revert changes in place, minimizing downtime. A common trap is assuming you must launch new instances or modify the Auto Scaling group, which introduces unnecessary delay and risk. Instead, remember the memory tip: “Setup to set back”—the same recipe that set the version can set it back, making the Setup event your primary rollback tool.
DOP-C02 SDLC Automation 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. 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 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 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 D is correct because OpsWorks supports rollback by running a previous setup recipe. Option A is wrong because it would cause downtime during re-provisioning. Option B is wrong because it takes time and may not restore the exact state. Option C is wrong because replacing instances is slow and may cause data loss.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 recipe will reinstall the old PHP version.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a new AMI with the old PHP version, launch new instances, and terminate the old ones.
Why it's wrong here
Incorrect: Time-consuming and may cause longer downtime.
✗
Use the OpsWorks 'Rollback' feature to revert the stack to a previous state.
Why it's wrong here
Incorrect: OpsWorks does not have a built-in rollback feature.
✗
Manually SSH into each instance and downgrade the PHP package, then restart the web server.
Why it's wrong here
Incorrect: Not automated, and manual steps risk errors and downtime.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..
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 D is correct because OpsWorks supports rollback by running a previous setup recipe. Option A is wrong because it would cause downtime during re-provisioning. Option B is wrong because it takes time and may not restore the exact state. Option C is wrong because replacing instances is slow and may cause data loss.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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