The correct answer is that the build environment image does not have the Go runtime installed. This error occurs because AWS CodeBuild executes build commands within a specific container image, and if that image lacks the Go binary, the shell cannot resolve the 'go' command from the system PATH. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how CodeBuild environments are provisioned—a common trap is assuming the error stems from a missing buildspec or incorrect IAM permissions, when the root cause is simply an incompatible runtime image. To fix 'go: command not found' in AWS CodeBuild, you must either select a managed image that includes Go (like the standard Ubuntu or Amazon Linux 2 images with Go pre-installed) or explicitly install Go during the install phase of your buildspec. Remember the memory tip: "Image first, install second"—always verify the environment image before troubleshooting other build failures.
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 developer is setting up AWS CodeBuild to compile a Go application. The build fails with the error: 'go: command not found'. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The build environment image does not have the Go runtime installed
The error 'go: command not found' indicates that the Go executable is not available in the build environment's PATH. CodeBuild uses a managed or custom build environment image (e.g., Ubuntu, Amazon Linux 2) to run build commands. If the image does not include the Go runtime, the shell cannot locate the 'go' binary, causing the build to fail. The most direct fix is to select a build environment image that has Go pre-installed or to install Go in the install phase of the buildspec.
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.
✗
The environment variables in buildspec.yml are incorrectly set
Why it's wrong here
Environment variables do not affect command existence.
✗
The build project does not have enough memory to compile Go code
Why it's wrong here
Insufficient memory would cause out-of-memory errors, not command not found.
✓
The build environment image does not have the Go runtime installed
Why this is correct
CodeBuild images are version-specific; e.g., aws/codebuild/amazonlinux2-x86_64-standard:3.0 does not include Go by default.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CodeBuild service role does not have permission to access the S3 bucket for artifacts
Why it's wrong here
Permission issues would result in access denied, not command not found.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often blame environment variables (Option A) or permissions (Option D) because they are common build failures, but the root cause is the missing runtime in the build environment image — a fundamental prerequisite that CodeBuild does not automatically provide.
Trap categories for this question
Command / output trap
Environment variables do not affect command existence.
Detailed technical explanation
How to think about this question
CodeBuild supports managed images (e.g., aws/codebuild/amazonlinux2-x86_64-standard:4.0) that include specific runtimes. For Go, you must use an image like 'aws/codebuild/standard:7.0' (which includes Go 1.x) or a custom image with Go installed. The buildspec's 'install' phase can also install Go via commands like 'curl -OL https://go.dev/dl/go1.21.0.linux-amd64.tar.gz && tar -C /usr/local -xzf go1.21.0.linux-amd64.tar.gz && export PATH=$PATH:/usr/local/go/bin', but if the base image lacks curl or tar, even that fails. Under the hood, CodeBuild runs commands in a non-interactive shell, so PATH is derived from the image's default environment.
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.
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: The build environment image does not have the Go runtime installed — The error 'go: command not found' indicates that the Go executable is not available in the build environment's PATH. CodeBuild uses a managed or custom build environment image (e.g., Ubuntu, Amazon Linux 2) to run build commands. If the image does not include the Go runtime, the shell cannot locate the 'go' binary, causing the build to fail. The most direct fix is to select a build environment image that has Go pre-installed or to install Go in the install phase of the buildspec.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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