The answer is to define environment variables in the source code using .ebextensions configuration files. This approach is correct because .ebextensions files are declarative YAML or JSON configurations stored directly in your application bundle, which Elastic Beanstalk automatically reads during environment creation and every subsequent deployment. By embedding environment variables here, you eliminate the dependency on runtime injection or manual steps, ensuring consistency across CodePipeline stages without relying on CodeBuild to pass them separately. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of immutable infrastructure patterns and the separation of build-time versus runtime configuration. A common trap is assuming environment variables must be set in the Elastic Beanstalk console or passed via CodeBuild environment variables, but those approaches are fragile and break pipeline automation. Memory tip: think of .ebextensions as the “source of truth” baked into your code—if it’s in the bundle, it’s in the environment.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 CodePipeline to deploy a Node.js application to AWS Elastic Beanstalk. The pipeline includes a build stage using AWS CodeBuild. Developers notice that the deployed application occasionally crashes due to missing environment variables that were configured in the Elastic Beanstalk environment but not passed from CodeBuild. What is the MOST efficient way to ensure the environment variables are consistently applied?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define environment variables in the source code using .ebextensions configuration files.
Option A is correct because .ebextensions configuration files allow you to define environment variables declaratively in the source code, ensuring they are consistently applied during every deployment via CodePipeline. This approach eliminates the dependency on runtime or manual steps, as the Elastic Beanstalk environment automatically reads these files during environment creation and updates. It integrates seamlessly with CodeBuild and CodePipeline, making it the most efficient and reliable method for maintaining environment variable consistency.
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.
✓
Define environment variables in the source code using .ebextensions configuration files.
Why this is correct
.ebextensions files are processed during deployment, ensuring consistency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the environment variables manually in the Elastic Beanstalk console after each deployment.
Why it's wrong here
Manual step is error-prone and not automated.
✗
Use the aws elasticbeanstalk update-environment CLI command after the pipeline completes.
Why it's wrong here
Requires additional pipeline stage and is not the most efficient.
✗
Store environment variables in AWS Systems Manager Parameter Store and have the application retrieve them at runtime.
Why it's wrong here
This addresses runtime retrieval but not the pipeline's build stage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume runtime parameter retrieval (e.g., from Parameter Store or Secrets Manager) is the best practice for all scenarios, but for environment variables required at process startup in Elastic Beanstalk, .ebextensions provide a more reliable and simpler solution that avoids application code changes and ensures variables are set before the application runs.
Detailed technical explanation
How to think about this question
Under the hood, .ebextensions files are YAML or JSON configuration files placed in the .ebextensions directory of your source bundle. Elastic Beanstalk processes these files during environment provisioning and updates, using the `option_settings` key to set environment properties that are injected as OS-level environment variables into the application process. This method ensures that environment variables are part of the deployment artifact, making them version-controlled and automatically applied during CodePipeline deployments, even if the environment is rebuilt or replaced.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Define environment variables in the source code using .ebextensions configuration files. — Option A is correct because .ebextensions configuration files allow you to define environment variables declaratively in the source code, ensuring they are consistently applied during every deployment via CodePipeline. This approach eliminates the dependency on runtime or manual steps, as the Elastic Beanstalk environment automatically reads these files during environment creation and updates. It integrates seamlessly with CodeBuild and CodePipeline, making it the most efficient and reliable method for maintaining environment variable consistency.
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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