This DVA-C02 practice question tests your understanding of deployment. 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.
Exhibit
DeploymentId: d-EXAMPLE123
Status: FAILED
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.
Instance logs:
i-abc12345: Script 'BeforeInstall' failed with exit code 1
Refer to the exhibit. A developer is troubleshooting a failed CodeDeploy deployment to an EC2 Auto Scaling group. The instance logs show that the 'BeforeInstall' script failed with exit code 1. What should the developer do to resolve the issue?
Exhibit
DeploymentId: d-EXAMPLE123
Status: FAILED
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.
Instance logs:
i-abc12345: Script 'BeforeInstall' failed with exit code 1
A
Review the BeforeInstall script for errors and fix them.
Exit code 1 indicates script error.
B
Ensure the CodeDeploy agent is installed and running on the instance.
Why wrong: Agent is running if script executes.
C
Verify that the scripts location in the AppSpec file is correct.
Why wrong: The script ran but failed.
D
Check that the instance's IAM role has permissions to download the revision.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the BeforeInstall script for errors and fix them.
The 'BeforeInstall' script failed with exit code 1, which is a generic error indicating the script itself encountered an issue during execution. The developer should review the script for errors, such as syntax mistakes, missing dependencies, or incorrect commands, and fix them. This is the most direct and appropriate action because the failure is explicitly tied to the script's execution, not to infrastructure or permissions.
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.
✓
Review the BeforeInstall script for errors and fix them.
Why this is correct
Exit code 1 indicates script error.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ensure the CodeDeploy agent is installed and running on the instance.
Why it's wrong here
Agent is running if script executes.
✗
Verify that the scripts location in the AppSpec file is correct.
Why it's wrong here
The script ran but failed.
✗
Check that the instance's IAM role has permissions to download the revision.
Why it's wrong here
Download succeeded if script runs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a script failure is always due to permissions or agent issues, but the exit code 1 specifically points to a script-level error, not infrastructure or configuration problems.
Detailed technical explanation
How to think about this question
CodeDeploy lifecycle hooks like 'BeforeInstall' execute scripts defined in the AppSpec file. Exit code 1 typically indicates a runtime error within the script, such as a command not found, a file permission issue, or a logic error. The developer should check the script's stderr output in the CodeDeploy agent logs (e.g., /var/log/aws/codedeploy-agent/codedeploy-agent.log) to identify the specific failure, then correct the script and redeploy.
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.
Visual reference
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Review the BeforeInstall script for errors and fix them. — The 'BeforeInstall' script failed with exit code 1, which is a generic error indicating the script itself encountered an issue during execution. The developer should review the script for errors, such as syntax mistakes, missing dependencies, or incorrect commands, and fix them. This is the most direct and appropriate action because the failure is explicitly tied to the script's execution, not to infrastructure or permissions.
What should I do if I get this DVA-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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