DOP-C02 CodeDeploy deployment failure troubleshooting Practice Question
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 CodeDeploy for deploying applications to an Auto Scaling group of Amazon EC2 instances. The deployment is failing with the error 'The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available, or some instances in your deployment group are experiencing problems.' Which two actions should the DevOps engineer take to troubleshoot and resolve the issue? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the CodeDeploy agent logs on the failed instances to identify script errors or missing dependencies.
Option A is correct because the CodeDeploy agent logs on each EC2 instance contain detailed error messages about script failures, missing dependencies, or permission issues that cause the deployment to fail. Checking these logs is the first step in diagnosing why individual instances are failing, as the agent executes the AppSpec lifecycle hooks and reports back to the CodeDeploy service.
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.
✗
Increase the size of the Auto Scaling group to ensure more instances are available.
Why it's wrong here
Increasing the group size does not address the underlying cause; it might mask the issue.
✗
Change the deployment configuration to 'CodeDeployDefault.AllAtOnce' to bypass the error.
Why it's wrong here
Changing the deployment configuration does not resolve the underlying issue; it may cause downtime.
✗
Redeploy the application using a different revision.
Why it's wrong here
Redeploying the same revision will likely fail again; the root cause must be addressed.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The DOP-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Check the CodeDeploy agent logs on the failed instances to identify script errors or missing dependencies.Correct answer▾✗Increase the size of the Auto Scaling group to ensure more instances are available.Wrong answer — click to see why▾
Why this is wrong here
Increasing the group size does not address the underlying cause; it might mask the issue.
✗Change the deployment configuration to 'CodeDeployDefault.AllAtOnce' to bypass the error.Wrong answer — click to see why▾
Why this is wrong here
Changing the deployment configuration does not resolve the underlying issue; it may cause downtime.
✗Redeploy the application using a different revision.Wrong answer — click to see why▾
Why this is wrong here
Redeploying the same revision will likely fail again; the root cause must be addressed.
Analysis generated from the official DOP-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to scaling or configuration changes (like AllAtOnce) without first checking the instance-level logs, which are the definitive source for diagnosing deployment failures in CodeDeploy.
Detailed technical explanation
How to think about this question
The CodeDeploy agent runs as a background process on each EC2 instance and writes logs to /var/log/aws/codedeploy-agent/codedeploy-agent.log on Linux or C:\ProgramData\Amazon\CodeDeploy\logs\codedeploy-agent.log on Windows. These logs capture the exit codes and stderr output from each lifecycle event hook (e.g., BeforeInstall, AfterInstall, ApplicationStart), which is critical for pinpointing script failures. The error message 'too many individual instances failed deployment' is triggered when the number of failed instances exceeds the minimum healthy hosts defined in the deployment configuration (e.g., CodeDeployDefault.OneAtATime requires at least 75% healthy hosts).
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Check the CodeDeploy agent logs on the failed instances to identify script errors or missing dependencies. — Option A is correct because the CodeDeploy agent logs on each EC2 instance contain detailed error messages about script failures, missing dependencies, or permission issues that cause the deployment to fail. Checking these logs is the first step in diagnosing why individual instances are failing, as the agent executes the AppSpec lifecycle hooks and reports back to the CodeDeploy service.
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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Question Discussion
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