The answer is to increase the file system size or add commands to clean up temporary files in the buildspec. This directly resolves the 'No space left on device' error because AWS CodeBuild's build environments have a fixed ephemeral storage limit, and when unit tests or compilation generate large temporary artifacts, the disk fills up. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of build environment resource management, specifically that disk space is a separate concern from compute or memory. A common trap is assuming a larger instance type (like general1.large) automatically provides more disk space, but instance size primarily affects vCPU and RAM, not the underlying EBS volume. Instead, you must either increase the file system size via the build environment configuration or add cleanup commands—such as `rm -rf /tmp/*` or `docker system prune`—in the pre_build or post_build phases. Memory tip: "Disk is not instance size"—always check storage configuration, not just compute tier, when troubleshooting disk errors.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 CodeBuild to compile and test Java code. The buildspec.yml file includes a 'pre_build' phase that runs unit tests. The build occasionally fails with the error 'No space left on device.' The build environment is a general1.medium EC2 instance with 160 GB of disk space. What is the MOST effective solution to resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the file system size or add commands to clean up temporary files in the buildspec.
Option C is correct because increasing the file system size or cleaning up disk space addresses the 'No space left' error. Option A is incorrect because using a larger instance type may not increase disk space. Option B is incorrect because the error is disk-related, not memory. Option D is incorrect because the error is not related to dependencies not being cached.
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.
✓
Increase the file system size or add commands to clean up temporary files in the buildspec.
Why this is correct
Cleaning up disk space or using a larger file system resolves the 'No space left' error.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the build to use an Amazon EFS file system to offload data.
Why it's wrong here
EFS provides shared storage but does not increase the local build disk; the build may still use local storage.
✗
Switch the build environment to a compute type with more memory, such as general1.large.
Why it's wrong here
More memory does not increase disk space; the error is about disk space.
✗
Enable the 'cache' feature in CodeBuild to reuse dependencies and reduce disk usage.
Why it's wrong here
Caching dependencies may reduce download time but does not free up disk space if already filled.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the file system size or add commands to clean up temporary files in the buildspec. — Option C is correct because increasing the file system size or cleaning up disk space addresses the 'No space left' error. Option A is incorrect because using a larger instance type may not increase disk space. Option B is incorrect because the error is disk-related, not memory. Option D is incorrect because the error is not related to dependencies not being cached.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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