- A
Configure CodeDeploy to set up the build environment before the build starts.
Why wrong: CodeDeploy is for application deployment, not build environment setup.
- B
Define the build environment using a buildspec.yml file that includes runtime versions and environment variables.
The buildspec file is the primary way to define build commands and environment.
- C
Use an Elastic Beanstalk environment to run the build.
Why wrong: Elastic Beanstalk is for running applications, not for CI/CD build environments.
- D
Use a custom Docker image stored in Amazon ECR as the build environment.
CodeBuild allows you to specify a custom image to run builds in.
- E
Use an AWS CloudFormation template to specify the build environment configuration.
Why wrong: CloudFormation is for provisioning resources, not for CodeBuild build environment definitions.
Quick Answer
The answer is using a custom Docker image stored in Amazon ECR and defining the build environment directly within the buildspec.yml file. These two approaches are valid because AWS CodeBuild treats the build environment as code through either a pre-built Docker image that encapsulates the runtime, tools, and dependencies, or through the buildspec.yml file, which declaratively specifies runtime versions, environment variables, and build phases at the source root. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of infrastructure as code for CI/CD, often appearing as a trap where candidates mistakenly select only the Docker image option or overlook the buildspec’s role in environment definition. A common memory tip is to remember that the buildspec is your “environment recipe” written in YAML, while the custom Docker image is your “pre-cooked environment container”—both are valid IaC patterns for CodeBuild.
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 DevOps team is designing a CI/CD pipeline using AWS CodeBuild and CodePipeline. They want to use infrastructure as code to define the build environment. Which TWO options are valid approaches to define the build environment in CodeBuild?
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
Define the build environment using a buildspec.yml file that includes runtime versions and environment variables.
Option B is correct because the buildspec.yml file is the primary mechanism in AWS CodeBuild to define the build environment, including runtime versions (e.g., runtime: nodejs:18) and environment variables. This file is placed at the root of the source code and instructs CodeBuild on how to execute the build phases, making it a valid infrastructure-as-code approach for environment configuration.
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.
- ✗
Configure CodeDeploy to set up the build environment before the build starts.
Why it's wrong here
CodeDeploy is for application deployment, not build environment setup.
- ✓
Define the build environment using a buildspec.yml file that includes runtime versions and environment variables.
Why this is correct
The buildspec file is the primary way to define build commands and environment.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an Elastic Beanstalk environment to run the build.
Why it's wrong here
Elastic Beanstalk is for running applications, not for CI/CD build environments.
- ✓
Use a custom Docker image stored in Amazon ECR as the build environment.
Why this is correct
CodeBuild allows you to specify a custom image to run builds in.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an AWS CloudFormation template to specify the build environment configuration.
Why it's wrong here
CloudFormation is for provisioning resources, not for CodeBuild build environment definitions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think CloudFormation or CodeDeploy can define the build environment, but CodeBuild only accepts environment definitions via buildspec.yml or a custom Docker image, not through external IaC services.
Detailed technical explanation
How to think about this question
CodeBuild supports two primary methods for defining the build environment: using a managed image with a buildspec.yml that declares runtime versions (e.g., runtime-versions section for Python, Java, Node.js) and environment variables, or using a custom Docker image from Amazon ECR that includes pre-installed dependencies. The buildspec.yml is processed by the CodeBuild agent during the install phase, where it resolves runtime versions and sets environment variables before executing build commands. In real-world scenarios, teams often combine both approaches—using a custom image for consistent tooling and a buildspec.yml for project-specific runtime overrides.
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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 the build environment using a buildspec.yml file that includes runtime versions and environment variables. — Option B is correct because the buildspec.yml file is the primary mechanism in AWS CodeBuild to define the build environment, including runtime versions (e.g., runtime: nodejs:18) and environment variables. This file is placed at the root of the source code and instructs CodeBuild on how to execute the build phases, making it a valid infrastructure-as-code approach for environment configuration.
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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Last reviewed: Jun 11, 2026
This DOP-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 DOP-C02 exam.
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