DVA-C02 Deployment Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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
✓
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.
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
An exit code of 1 from a CodeDeploy lifecycle hook script, such as `BeforeInstall`, explicitly indicates that the script itself encountered an error and terminated abnormally. This typically means there's a syntax error, a command failed, or a logical condition within the script was not met, preventing successful execution of its intended tasks. Troubleshooting should involve reviewing the script's contents, checking logs on the instance for specific error messages, and ensuring all commands within it are valid and executable in the target environment.
- ✗
Ensure the CodeDeploy agent is installed and running on the instance.
Why it's wrong here
If the `BeforeInstall` script executed, even if it failed with an exit code 1, it confirms that the CodeDeploy agent was successfully installed, running, and actively managing the deployment on the instance. A non-running agent would prevent the deployment from even reaching the script execution phase, instead failing much earlier with an agent-related error or a timeout during the initial deployment setup. Therefore, the agent's operational status is not the root cause of a script execution failure.
- ✗
Verify that the scripts location in the AppSpec file is correct.
Why it's wrong here
The fact that the `BeforeInstall` script *ran* and produced an exit code implies that CodeDeploy successfully located and invoked it according to the AppSpec file. If the script's location in the AppSpec file were incorrect, CodeDeploy would report an error indicating it could not find or execute the specified script, rather than reporting an exit code from the script's execution itself. Thus, the AppSpec file's script path is validated by the script's attempt to run.
- ✗
Check that the instance's IAM role has permissions to download the revision.
Why it's wrong here
The `BeforeInstall` lifecycle hook executes *after* the application revision has been successfully downloaded from the S3 bucket or GitHub repository to the instance. If the deployment reached the `BeforeInstall` phase, it confirms that the instance's IAM role possessed the necessary `s3:GetObject` or equivalent permissions to retrieve the revision. A permissions issue for downloading would cause the deployment to fail during the 'Download Bundle' stage, long before any install scripts are invoked.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.