- A
Use AWS CodeDeploy with an ECS compute platform, configure a CloudWatch alarm for health checks, and enable automatic rollback.
CodeDeploy supports blue/green deployments for ECS and can automatically roll back based on CloudWatch alarms.
- B
Use AWS CloudFormation with a custom resource to perform blue/green deployment.
Why wrong: Custom resources are complex and not the standard approach.
- C
Use AWS Elastic Beanstalk with blue/green environment swapping.
Why wrong: Elastic Beanstalk is not for ECS.
- D
Use AWS CodePipeline with ECS deployment action and manual approval for rollback.
Why wrong: Manual approval does not provide automatic rollback.
Question 636 of 1,750
ECS Blue/Green Deployment with Automatic Rollback
This DOP-C02 practice question tests your understanding of sdlc automation. 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 DevOps engineer is designing a CI/CD pipeline for a microservices architecture. The pipeline must deploy to Amazon ECS using blue/green deployments. The team wants to automatically roll back if the new deployment fails health checks. Which combination of AWS services and configurations 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
✓
Use AWS CodeDeploy with an ECS compute platform, configure a CloudWatch alarm for health checks, and enable automatic rollback.
AWS CodeDeploy with an ECS compute platform natively supports blue/green deployments for Amazon ECS, including automatic rollback triggered by CloudWatch alarms. By configuring a CloudWatch alarm based on ECS service health checks (e.g., ELB target group health), CodeDeploy can automatically revert to the original blue task set if the new green deployment fails, meeting the requirement for zero-touch rollback.
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.
- ✓
Use AWS CodeDeploy with an ECS compute platform, configure a CloudWatch alarm for health checks, and enable automatic rollback.
Why this is correct
CodeDeploy supports blue/green deployments for ECS and can automatically roll back based on CloudWatch alarms.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS CloudFormation with a custom resource to perform blue/green deployment.
Why it's wrong here
Custom resources are complex and not the standard approach.
- ✗
Use AWS Elastic Beanstalk with blue/green environment swapping.
Why it's wrong here
Elastic Beanstalk is not for ECS.
- ✗
Use AWS CodePipeline with ECS deployment action and manual approval for rollback.
Why it's wrong here
Manual approval does not provide automatic rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume CodePipeline's ECS action supports automatic rollback, but it only provides a deployment action without native health check monitoring or rollback logic, requiring additional custom steps or manual intervention.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy for ECS uses an AppSpec file to define the task definition and container port mappings, and it orchestrates the shift of traffic from the blue (original) task set to the green (new) task set via an Elastic Load Balancer (ELB) target group. The CloudWatch alarm monitors the green task set's health check metrics (e.g., HTTP 5xx errors or target group unhealthy host count), and when breached, CodeDeploy triggers an automatic rollback by shifting 100% of traffic back to the blue task set and terminating the green task set. A subtle behavior is that the rollback also reverts the ECS service's task definition to the previous version, ensuring consistency.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS CodeDeploy with an ECS compute platform, configure a CloudWatch alarm for health checks, and enable automatic rollback. — AWS CodeDeploy with an ECS compute platform natively supports blue/green deployments for Amazon ECS, including automatic rollback triggered by CloudWatch alarms. By configuring a CloudWatch alarm based on ECS service health checks (e.g., ELB target group health), CodeDeploy can automatically revert to the original blue task set if the new green deployment fails, meeting the requirement for zero-touch rollback.
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.
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Last reviewed: Jul 4, 2026
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