- A
Create an AWS Lambda function that processes the commit message and calls CodeBuild.
Why wrong: Incorrect: Adds complexity; not required.
- B
Create a CloudWatch Events rule to invoke CodeBuild on every push to CodeCommit.
Why wrong: Incorrect: Must filter by commit message.
- C
Configure a webhook in CodeBuild that filters events by commit message pattern.
Correct: Webhooks can filter by pattern.
- D
Create a custom trigger in CodeCommit that invokes CodeBuild.
Why wrong: Create a custom trigger in CodeCommit that invokes CodeBuild — This is incorrect because CodeCommit triggers can only invoke AWS Lambda or Amazon SNS, not CodeBuild directly.
- E
Use a buildspec.yml file with a conditional phase that checks the commit message.
Correct: The buildspec can skip build if message doesn't match.
Trigger CodeBuild on Commit Message Pattern: Use Webhook Filters
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 company uses AWS CodeCommit for source control and AWS CodeBuild for building a Java application. They want to enforce that every commit triggers a build, but only if the commit message contains a specific pattern 'BUILD:'. Which THREE steps are required?
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 a webhook in CodeBuild that filters events by commit message pattern.
Option C is correct because CodeBuild supports webhooks that can be configured to trigger builds based on specific Git events, including filtering by commit message patterns using regular expressions. This allows the company to enforce that only commits containing 'BUILD:' in their message trigger a build, without needing additional infrastructure like Lambda functions or custom scripts. Option E is correct because a buildspec.yml file can include a conditional phase that checks the commit message, allowing fine-grained control over whether the build proceeds. Option D is incorrect because CodeCommit triggers cannot directly invoke CodeBuild; they can only invoke Lambda or SNS. Option A is incorrect because using a Lambda function is overly complex and unnecessary. Option B is incorrect because CloudWatch Events can trigger CodeBuild on push, but cannot filter by commit message pattern.
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.
- ✗
Create an AWS Lambda function that processes the commit message and calls CodeBuild.
Why it's wrong here
Incorrect: Adds complexity; not required.
- ✗
Create a CloudWatch Events rule to invoke CodeBuild on every push to CodeCommit.
Why it's wrong here
Incorrect: Must filter by commit message.
- ✓
Configure a webhook in CodeBuild that filters events by commit message pattern.
Why this is correct
Correct: Webhooks can filter by pattern.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a custom trigger in CodeCommit that invokes CodeBuild.
Why it's wrong here
Create a custom trigger in CodeCommit that invokes CodeBuild — This is incorrect because CodeCommit triggers can only invoke AWS Lambda or Amazon SNS, not CodeBuild directly.
- ✓
Use a buildspec.yml file with a conditional phase that checks the commit message.
Why this is correct
Correct: The buildspec can skip build if message doesn't match.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may incorrectly think CodeCommit triggers can invoke CodeBuild directly, or they may over-engineer the solution with Lambda or CloudWatch Events, not realizing that CodeBuild's built-in webhook filtering is simpler and more effective for message pattern matching.
Detailed technical explanation
How to think about this question
CodeBuild webhooks use Git events (e.g., PUSH, PULL_REQUEST_MERGE) and allow filtering via the 'filterGroups' parameter, which supports regular expressions on commit messages, branch names, and file paths. Under the hood, CodeCommit sends a notification to CodeBuild via Amazon EventBridge (formerly CloudWatch Events) when a webhook is configured, and CodeBuild evaluates the filter before starting the build. This approach is more efficient than polling or using Lambda because it leverages event-driven architecture without additional compute overhead.
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.
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: Configure a webhook in CodeBuild that filters events by commit message pattern. — Option C is correct because CodeBuild supports webhooks that can be configured to trigger builds based on specific Git events, including filtering by commit message patterns using regular expressions. This allows the company to enforce that only commits containing 'BUILD:' in their message trigger a build, without needing additional infrastructure like Lambda functions or custom scripts. Option E is correct because a buildspec.yml file can include a conditional phase that checks the commit message, allowing fine-grained control over whether the build proceeds. Option D is incorrect because CodeCommit triggers cannot directly invoke CodeBuild; they can only invoke Lambda or SNS. Option A is incorrect because using a Lambda function is overly complex and unnecessary. Option B is incorrect because CloudWatch Events can trigger CodeBuild on push, but cannot filter by commit message pattern.
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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