DVA-C02 appspec.yml Practice Question
A company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails during the BeforeInstall lifecycle event. What should the developer do to troubleshoot the issue?
⚠ Common exam trap
A common trap is to overlook the appspec.yml file and instead check deployment group or configuration settings when the issue is clearly with the script specified in the appspec hooks.
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
✓
Check the appspec.yml file for errors in the BeforeInstall hook.
The BeforeInstall hook scripts are defined in the appspec.yml file, and a failure during that lifecycle event typically indicates an error in the script or the hook configuration. Option A is wrong because the deployment group configuration (e.g., Auto Scaling group, tags) does not directly cause a script failure in the BeforeInstall hook. Option B is wrong because the build output from CodeBuild is already successful and not related to the deployment failure. Option D is wrong because deployment configuration settings (e.g., deployment type, rollback triggers) do not affect the execution of the BeforeInstall hook scripts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the deployment group configuration.
Why it's wrong here
The deployment group configuration controls instance selection, the deployment type (in-place vs. blue/green), and the IAM service role used by CodeDeploy. A failure inside the BeforeInstall hook is a lifecycle-script or AppSpec error, not a deployment-group setting; if the group were misconfigured you would see instance registration, connectivity, or authorization failures before any hook runs. Thus, checking it would not reveal why BeforeInstall failed.
- ✗
Verify the build output from CodeBuild.
Why it's wrong here
CodeBuild produces the build artifact that CodeDeploy downloads and unpacks during the deployment. A compilation, dependency, or packaging error would fail the CodeBuild build itself, not surface as a BeforeInstall hook failure. Since CodeDeploy successfully reached the hook-execution phase, the artifact was built, uploaded, and downloaded correctly, so the build output is not the relevant piece to inspect.
- ✓
Check the appspec.yml file for errors in the BeforeInstall hook.
Why this is correct
The BeforeInstall hook is defined in the appspec.yml file under the hooks section, so a malformed YAML, an incorrect hook name, a missing script path, or a script without the execute permission will cause CodeDeploy to fail at that stage. You need to inspect the appspec.yml and the script it references to identify the exact error, because lifecycle hooks are entirely driven by that file, not by the deployment group or deployment configuration.
- ✗
Review the deployment configuration settings.
Why it's wrong here
A deployment configuration in CodeDeploy defines rollout speed and minimum healthy host requirements (for example, AllAtOnce, OneAtATime, or Canary), and it determines whether a deployment is deemed successful based on instance health after deployment. It does not define or control lifecycle hooks, and it does not run BeforeInstall scripts. A hook failure is an AppSpec execution issue, so reviewing this setting would not help resolve or diagnose the error.
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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.