- A
Configure an Amazon EventBridge rule to detect ECR image pushes and invoke an AWS Lambda function that calls 'UpdateStack' with the new image URI.
EventBridge can capture ECR events and trigger Lambda to update the stack.
- B
Create a CodeBuild project that triggers on ECR push, and have the build execute an 'aws cloudformation update-stack' command.
Why wrong: CodeBuild can run commands, but the trigger should be event-driven via Lambda or EventBridge for simplicity.
- C
Use AWS CodeDeploy with a trigger on ECR push to deploy the new image to a target group, and have the target group update the stack.
Why wrong: CodeDeploy does not update CloudFormation stacks.
- D
Set up an Amazon SNS topic subscribed to ECR image push events, and have the SNS topic send a notification to an AWS CloudFormation stack update endpoint.
Why wrong: SNS cannot directly update a CloudFormation stack; it would need a subscriber like Lambda.
Trigger CloudFormation Stack Update from ECR Image Push
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 team uses AWS CloudFormation to manage infrastructure. They want to automatically update the stack when a new version of a Docker image is pushed to Amazon ECR. Which approach should they 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
Configure an Amazon EventBridge rule to detect ECR image pushes and invoke an AWS Lambda function that calls 'UpdateStack' with the new image URI.
Option A is correct. Amazon EventBridge can detect ECR image push events and invoke a Lambda function that calls the UpdateStack API with the new image URI. This provides a serverless, event-driven automation directly integrated with CloudFormation. Option B is incorrect because a CodeBuild project triggered on ECR push would add unnecessary overhead and complexity; it is not the simplest or most direct approach for updating a stack. Option C is incorrect because AWS CodeDeploy is designed for deploying to compute services (like EC2, Lambda, or ECS), not for updating CloudFormation stacks. Option D is incorrect because Amazon SNS cannot directly update a CloudFormation stack; it would require a subscriber (e.g., Lambda) to process the notification and call UpdateStack, making the direct integration nonexistent.
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.
- ✓
Configure an Amazon EventBridge rule to detect ECR image pushes and invoke an AWS Lambda function that calls 'UpdateStack' with the new image URI.
Why this is correct
EventBridge can capture ECR events and trigger Lambda to update the stack.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a CodeBuild project that triggers on ECR push, and have the build execute an 'aws cloudformation update-stack' command.
Why it's wrong here
CodeBuild can run commands, but the trigger should be event-driven via Lambda or EventBridge for simplicity.
- ✗
Use AWS CodeDeploy with a trigger on ECR push to deploy the new image to a target group, and have the target group update the stack.
Why it's wrong here
CodeDeploy does not update CloudFormation stacks.
- ✗
Set up an Amazon SNS topic subscribed to ECR image push events, and have the SNS topic send a notification to an AWS CloudFormation stack update endpoint.
Why it's wrong here
SNS cannot directly update a CloudFormation stack; it would need a subscriber like Lambda.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
CodeBuild can run commands, but the trigger should be event-driven via Lambda or EventBridge for simplicity.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: Configure an Amazon EventBridge rule to detect ECR image pushes and invoke an AWS Lambda function that calls 'UpdateStack' with the new image URI. — Option A is correct. Amazon EventBridge can detect ECR image push events and invoke a Lambda function that calls the UpdateStack API with the new image URI. This provides a serverless, event-driven automation directly integrated with CloudFormation. Option B is incorrect because a CodeBuild project triggered on ECR push would add unnecessary overhead and complexity; it is not the simplest or most direct approach for updating a stack. Option C is incorrect because AWS CodeDeploy is designed for deploying to compute services (like EC2, Lambda, or ECS), not for updating CloudFormation stacks. Option D is incorrect because Amazon SNS cannot directly update a CloudFormation stack; it would require a subscriber (e.g., Lambda) to process the notification and call UpdateStack, making the direct integration nonexistent.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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