The answer is to set the `terminateBlueInstancesOnDeploymentSuccess` action to `KEEP_ALIVE` and configure a `terminationWaitTimeInMinutes` value of 30. These two settings work together to keep old instances after blue/green deployment CodeDeploy: the `KEEP_ALIVE` action prevents automatic termination of the blue environment upon success, while the wait time specifies exactly how long those instances should remain running before being terminated. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of CodeDeploy’s blue/green lifecycle hooks, specifically the difference between the termination action and the wait timer—a common trap is confusing `terminationWaitTimeInMinutes` with non-existent properties like `waitTimeForBlueTermination`. Remember that you must always pair the action (`KEEP_ALIVE`) with the timer; setting only the wait time without changing the termination action will still terminate instances immediately. A helpful memory tip: think "Keep Alive + Wait Time = Rollback Window."
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 uses AWS CodeDeploy to manage deployments to an Amazon EC2 Auto Scaling group. The deployment group is configured with a blue/green deployment type. The developer notices that after a deployment, the old instances (blue environment) are terminated immediately after the new instances (green environment) pass health checks. The company wants to keep the old instances running for 30 minutes to allow for quick rollback if issues are detected. Which TWO configuration changes should the developer make to achieve this? (Choose TWO.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the 'terminateBlueInstancesOnDeploymentSuccess' action to 'KEEP_ALIVE'.
Options A and E are correct. To retain the old instances for a period, the developer must set the 'terminateBlueInstancesOnDeploymentSuccess' action to 'KEEP_ALIVE' (option A) and specify a 'terminationWaitTimeInMinutes' value of 30 (option E). Option B is incorrect because 'originalSettings' is not a valid retention type. Option C is incorrect because 'blueInstanceTermination' setting is not a property; the correct property is 'terminateBlueInstancesOnDeploymentSuccess'. Option D is incorrect because 'waitTimeForBlueTermination' is not a valid property name.
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.
✓
Set the 'terminateBlueInstancesOnDeploymentSuccess' action to 'KEEP_ALIVE'.
Why this is correct
This tells CodeDeploy not to terminate the blue instances immediately.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set the 'blueInstanceTermination' property to 'WAIT'.
Why it's wrong here
'WAIT' is not a valid value; the correct property is 'terminateBlueInstancesOnDeploymentSuccess'.
✓
Set the 'terminationWaitTimeInMinutes' to 30.
Why this is correct
This specifies the number of minutes to wait before terminating the blue instances.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set the 'blueInstanceTermination' property to 'originalSettings'.
Why it's wrong here
'originalSettings' is not a valid value.
✗
Set the 'waitTimeForBlueTermination' to 30.
Why it's wrong here
This is not a valid property.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Deployment — This question tests Deployment — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the 'terminateBlueInstancesOnDeploymentSuccess' action to 'KEEP_ALIVE'. — Options A and E are correct. To retain the old instances for a period, the developer must set the 'terminateBlueInstancesOnDeploymentSuccess' action to 'KEEP_ALIVE' (option A) and specify a 'terminationWaitTimeInMinutes' value of 30 (option E). Option B is incorrect because 'originalSettings' is not a valid retention type. Option C is incorrect because 'blueInstanceTermination' setting is not a property; the correct property is 'terminateBlueInstancesOnDeploymentSuccess'. Option D is incorrect because 'waitTimeForBlueTermination' is not a valid property name.
What should I do if I get this DVA-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 DVA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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