- A
Amazon EventBridge
EventBridge can detect ECR events and invoke a Lambda function to create the ECS service.
- B
AWS Step Functions
Why wrong: Step Functions requires an explicit trigger; it is not event-driven by default.
- C
Amazon CloudWatch Logs
Why wrong: CloudWatch Logs stores logs, it does not trigger workflows.
- D
Amazon S3
Why wrong: S3 is not directly involved in ECR event processing.
Question 876 of 1,750
Automating ECS Service Creation on ECR Image Push with EventBridge
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 developer wants to automate the creation of a new Amazon ECS service whenever a new Docker image is pushed to Amazon ECR. Which AWS service should be used to orchestrate this workflow?
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
✓
Amazon EventBridge
Amazon EventBridge can capture ECR image push events (via the 'ECR Image Action' event type) and route them to a target such as an ECS service or a Lambda function that triggers an ECS service update or creation. This serverless event bus natively integrates with ECR and ECS, making it the simplest and most direct service to orchestrate the workflow without custom polling or additional orchestration logic.
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.
- ✓
Amazon EventBridge
Why this is correct
EventBridge can detect ECR events and invoke a Lambda function to create the ECS service.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Step Functions
Why it's wrong here
Step Functions requires an explicit trigger; it is not event-driven by default.
- ✗
Amazon CloudWatch Logs
Why it's wrong here
CloudWatch Logs stores logs, it does not trigger workflows.
- ✗
Amazon S3
Why it's wrong here
S3 is not directly involved in ECR event processing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Step Functions as the primary orchestrator for event-driven workflows, but EventBridge is the correct service for reacting to AWS service events like ECR pushes, while Step Functions is for coordinating multi-step processes after the event is received.
Detailed technical explanation
How to think about this question
Under the hood, EventBridge uses a default event bus that listens for AWS service events, including ECR 'PutImage' API calls. The event pattern can be filtered by repository name, image tag, or action type, and the target can be an ECS service's 'RunTask' or 'UpdateService' API via a Lambda function or directly via the ECS API target. A real-world scenario is a CI/CD pipeline where a developer pushes a 'prod' tagged image, and EventBridge triggers an immediate blue/green deployment to ECS without manual intervention.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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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: Amazon EventBridge — Amazon EventBridge can capture ECR image push events (via the 'ECR Image Action' event type) and route them to a target such as an ECS service or a Lambda function that triggers an ECS service update or creation. This serverless event bus natively integrates with ECR and ECS, making it the simplest and most direct service to orchestrate the workflow without custom polling or additional orchestration logic.
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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