The answer is to use .ebextensions configuration files in the application source bundle. This is the correct approach because .ebextensions is the native Elastic Beanstalk mechanism for injecting environment-specific config into a custom platform during deployment; these YAML or JSON files, placed in the .ebextensions directory, are processed by the platform engine to create files, run commands, or modify settings before the application starts, ensuring the custom platform receives the precise configuration it needs. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of how Elastic Beanstalk handles configuration injection for custom platforms versus managed platforms, with a common trap being to confuse .ebextensions with .platform hooks or user data scripts—remember that .ebextensions runs before the application starts, while .platform hooks execute at specific lifecycle stages. A helpful memory tip: think of .ebextensions as the "pre-flight checklist" for your environment-specific settings, processed automatically before your app takes off.
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 is using AWS Elastic Beanstalk with a custom platform. The platform is based on Amazon Linux 2 and includes a pre-installed application. The DevOps team needs to inject environment-specific configuration files into the EC2 instances during deployment. Which approach should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use .ebextensions configuration files in the application source bundle
Option B is correct because .ebextensions configuration files are the native mechanism in Elastic Beanstalk to inject environment-specific configuration into EC2 instances during deployment. These YAML or JSON files, placed in the .ebextensions directory of the application source bundle, are processed by the Elastic Beanstalk platform engine to execute commands, create files, or modify configuration before the application starts, ensuring the custom platform receives the necessary environment-specific settings.
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.
✗
Use AWS CloudFormation to update the environment with new configuration
Why it's wrong here
CloudFormation manages the environment, not application configuration files.
✓
Use .ebextensions configuration files in the application source bundle
Why this is correct
.ebextensions are processed during deployment and can create files from configuration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use EC2 user-data scripts to download configuration from S3
Why it's wrong here
User-data runs at launch, not during each deployment.
✗
Store configuration in AWS Systems Manager Parameter Store and retrieve it in the application
Why it's wrong here
This requires application-level changes and does not inject files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse runtime parameter retrieval (Option D) with deployment-time file injection, or assume that user-data scripts (Option C) are sufficient for ongoing deployments, failing to recognize that Elastic Beanstalk's .ebextensions are specifically designed for this purpose and integrate seamlessly with the platform's lifecycle.
Detailed technical explanation
How to think about this question
Under the hood, .ebextensions files are processed by the Elastic Beanstalk platform's configuration manager, which executes the commands and file operations in a specific order during the deployment lifecycle (e.g., before the application starts). For custom platforms based on Amazon Linux 2, the platform hooks (e.g., platform hooks in /opt/elasticbeanstalk/hooks/) can also be used, but .ebextensions remain the standard, declarative approach for environment-specific configuration without modifying the platform itself. A subtle behavior is that .ebextensions files are re-applied on every deployment, ensuring configuration consistency even during rolling updates or environment rebuilds.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Use .ebextensions configuration files in the application source bundle — Option B is correct because .ebextensions configuration files are the native mechanism in Elastic Beanstalk to inject environment-specific configuration into EC2 instances during deployment. These YAML or JSON files, placed in the .ebextensions directory of the application source bundle, are processed by the Elastic Beanstalk platform engine to execute commands, create files, or modify configuration before the application starts, ensuring the custom platform receives the necessary environment-specific settings.
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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