- A
In-place deployment with a deployment group that has a failure threshold of 0.
Why wrong: Incorrect. In-place deployments do not automatically revert; failed instances remain.
- B
Blue/Green deployment with a load balancer to switch traffic only after health checks pass.
Correct. Blue/Green allows rolling back by switching traffic back to the original environment.
- C
Canary deployment that shifts 10% of traffic to the new version, then 100% after 10 minutes.
Why wrong: Incorrect. Canary deployments do not automatically roll back; they only shift traffic gradually.
- D
Linear deployment that shifts 10% of traffic every 10 minutes.
Why wrong: Incorrect. Linear deployments do not automatically roll back; traffic shifts continue.
Question 661 of 1,750
AWS CodeDeploy Blue/Green Deployment with Health Check Rollback
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 deploy applications to an Auto Scaling group. The deployment fails because the new version of the application crashes the instances. The DevOps engineer needs the Auto Scaling group to automatically replace the unhealthy instances with the previous working version. Which deployment configuration should the engineer use?
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
✓
Blue/Green deployment with a load balancer to switch traffic only after health checks pass.
Option B is correct because a blue/green deployment with a load balancer health check ensures that the new (green) instances are validated before any traffic is routed to them. If the new version crashes, the health checks fail, the load balancer keeps traffic on the old (blue) instances, and the Auto Scaling group can automatically terminate the unhealthy green instances and replace them with the previous working version by reverting to the original launch configuration or template.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
In-place deployment with a deployment group that has a failure threshold of 0.
Why it's wrong here
Incorrect. In-place deployments do not automatically revert; failed instances remain.
- ✓
Blue/Green deployment with a load balancer to switch traffic only after health checks pass.
Why this is correct
Correct. Blue/Green allows rolling back by switching traffic back to the original environment.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Canary deployment that shifts 10% of traffic to the new version, then 100% after 10 minutes.
Why it's wrong here
Incorrect. Canary deployments do not automatically roll back; they only shift traffic gradually.
- ✗
Linear deployment that shifts 10% of traffic every 10 minutes.
Why it's wrong here
Incorrect. Linear deployments do not automatically roll back; traffic shifts continue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deployment strategies (in-place, canary, linear) with rollback mechanisms, assuming that any traffic-shifting method automatically replaces unhealthy instances with the previous version, when in fact only blue/green deployments inherently isolate the new environment and allow a clean revert without affecting the old instances.
Detailed technical explanation
How to think about this question
Under the hood, a blue/green deployment with CodeDeploy creates a new Auto Scaling group for the green environment, and the load balancer target group health checks (e.g., HTTP 200 or TCP health checks) determine when traffic is switched. If the new application crashes, the health checks fail, and CodeDeploy can automatically roll back by terminating the green Auto Scaling group and keeping the blue group active, leveraging the original launch template or configuration. In a real-world scenario, this is critical for mission-critical applications where even a brief outage from a bad deployment must be avoided, as the health check interval (default 30 seconds) and unhealthy threshold (default 3 checks) provide rapid detection and isolation.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Configuration Management and IaC — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Blue/Green deployment with a load balancer to switch traffic only after health checks pass. — Option B is correct because a blue/green deployment with a load balancer health check ensures that the new (green) instances are validated before any traffic is routed to them. If the new version crashes, the health checks fail, the load balancer keeps traffic on the old (blue) instances, and the Auto Scaling group can automatically terminate the unhealthy green instances and replace them with the previous working version by reverting to the original launch configuration or template.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on DOP-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses AWS CodeDeploy to deploy applications to an Auto Scaling group. During a deployment, the new instances fail the health check and are terminated. The deployment fails. The team wants to automatically roll back to the previous working version. What should they do?
hard- A.Set up an Auto Scaling lifecycle hook to terminate instances and trigger a rollback.
- ✓ B.Configure the deployment group to automatically roll back when a deployment fails.
- C.Manually redeploy the last successful deployment revision after investigating the failure.
- D.Configure the deployment group to automatically redeploy the same revision on failure.
Why B: Option B is correct because AWS CodeDeploy provides a built-in rollback configuration that can be triggered automatically when a deployment fails. By enabling automatic rollback in the deployment group settings, CodeDeploy will redeploy the last successful revision when the current deployment fails health checks, without requiring manual intervention or additional infrastructure.
Variation 2. A DevOps engineer is designing a CI/CD pipeline for a microservices architecture on AWS. They want to use AWS CodeDeploy to deploy applications to an Auto Scaling group. The pipeline must ensure that only a small percentage of instances are updated at a time, and if health checks fail, the deployment is automatically rolled back. Which deployment configuration should be used?
hard- A.Blue/green deployment with a fixed number of instances.
- B.In-place deployment with 'CodeDeployDefault.AllAtOnce' configuration.
- C.In-place deployment with 'CodeDeployDefault.HalfAtATime' configuration.
- ✓ D.In-place deployment with 'CodeDeployDefault.OneAtATime' configuration and automatic rollback enabled.
Why D: The 'CodeDeployDefault.OneAtATime' configuration deploys to one instance at a time, ensuring only a small percentage of instances are updated simultaneously. Enabling automatic rollback triggers a rollback if health checks fail, meeting the requirement. Option D is correct. Option A (blue/green) is not in-place and typically updates all instances at once, not a small percentage. Option B (AllAtOnce) updates all instances simultaneously. Option C (HalfAtATime) updates half the instances, which is not as granular as OneAtATime and may not satisfy the 'small percentage' constraint.
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Last reviewed: Jul 4, 2026
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