- A
Use AWS CodeBuild to build and test the function locally
Why wrong: CodeBuild is not related to CloudFormation stack updates
- B
Enable detailed CloudFormation logging in the stack template
Why wrong: CloudFormation does not have detailed logging for function output
- C
Access the CloudWatch Logs log group for the Lambda function
Lambda writes logs to CloudWatch Logs automatically
- D
Review the CloudFormation stack events in the AWS Management Console
Why wrong: Stack events show resource creation status, not function logs
Question 872 of 1,750
CloudFormation Lambda Custom Resource Logs
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 troubleshooting a failed AWS CloudFormation stack update. The stack contains an AWS::Lambda::Function resource. The update failed with the error 'Resource creation cancelled' after a timeout. The engineer wants to view the logs from the Lambda function during the stack update to diagnose the issue. What should the engineer do?
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
✓
Access the CloudWatch Logs log group for the Lambda function
Option C is correct because AWS Lambda automatically sends function execution logs to Amazon CloudWatch Logs. When a Lambda function is invoked during a CloudFormation stack update (e.g., via a custom resource or a function that runs as part of the update), all stdout, stderr, and logging statements are captured in a log group named /aws/lambda/<function-name>. Accessing this log group allows the engineer to view detailed error messages, stack traces, or timeout-related output that caused the 'Resource creation cancelled' failure.
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 CodeBuild to build and test the function locally
Why it's wrong here
CodeBuild is not related to CloudFormation stack updates
- ✗
Enable detailed CloudFormation logging in the stack template
Why it's wrong here
CloudFormation does not have detailed logging for function output
- ✓
Access the CloudWatch Logs log group for the Lambda function
Why this is correct
Lambda writes logs to CloudWatch Logs automatically
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Review the CloudFormation stack events in the AWS Management Console
Why it's wrong here
Stack events show resource creation status, not function logs
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse CloudFormation stack events (which show resource-level status) with the actual application logs from the Lambda function, leading them to choose Option D instead of recognizing that CloudWatch Logs is the correct source for debugging function execution failures.
Trap categories for this question
Command / output trap
CloudFormation does not have detailed logging for function output
Detailed technical explanation
How to think about this question
Under the hood, when a Lambda function is invoked (either synchronously or asynchronously), the Lambda service streams all log output to a CloudWatch Logs log group. The log group name follows the pattern /aws/lambda/<function-name> and log streams are created per invocation instance. For a CloudFormation custom resource, the Lambda function's response (including failure details) is sent back to CloudFormation via the pre-signed S3 URL, but the raw logs in CloudWatch Logs contain the full execution context, including any unhandled exceptions or timeout errors that may not be fully captured in the stack event reason.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Access the CloudWatch Logs log group for the Lambda function — Option C is correct because AWS Lambda automatically sends function execution logs to Amazon CloudWatch Logs. When a Lambda function is invoked during a CloudFormation stack update (e.g., via a custom resource or a function that runs as part of the update), all stdout, stderr, and logging statements are captured in a log group named /aws/lambda/<function-name>. Accessing this log group allows the engineer to view detailed error messages, stack traces, or timeout-related output that caused the 'Resource creation cancelled' failure.
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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