PCDOE Building and implementing CI/CD pipelines Practice Question
This PCDOE practice question tests your understanding of building and implementing ci/cd pipelines. 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.
During a Cloud Build execution, the step fails with 'Error: could not find a valid 'Dockerfile' in context '.''. The build configuration file is located in a subdirectory called 'build/' and the Dockerfile is in the root of the repository. How should the team fix this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Specify the 'dir' field in the build step to point to the root.
Option C is correct because the Cloud Build step's `dir` field explicitly sets the working directory for the step. By specifying `dir: '.'` (or the repository root), Cloud Build will look for the Dockerfile in the root context, even though the build configuration file (`cloudbuild.yaml`) resides in the `build/` subdirectory. This ensures the Docker build context points to the correct location where the Dockerfile exists.
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.
✗
Create a symbolic link.
Why it's wrong here
This is a hack and not a best practice.
✗
Move the Cloud Build configuration file to the root.
Why it's wrong here
Moving the config file is not required; the dir field is more convenient.
✓
Specify the 'dir' field in the build step to point to the root.
Why this is correct
Setting 'dir: '.' or 'dir: '/' will make Docker use the root context.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the 'substitutions' to change context.
Why it's wrong here
Substitutions replace variables, they do not change the context directory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that the build configuration file's location dictates the Docker build context, leading candidates to incorrectly choose moving the config file or using substitutions, when the `dir` field is the correct and intended mechanism to control the working directory for a step.
Detailed technical explanation
How to think about this question
The `dir` field in a Cloud Build step sets the working directory relative to the repository root, and it controls where the step's commands execute and where relative paths (like the Dockerfile path) are resolved. Under the hood, Cloud Build clones the entire repository into `/workspace`, and the `dir` field adjusts the current working directory within that clone. A common real-world scenario is a monorepo with multiple microservices, each with its own Dockerfile in a subdirectory; using `dir` per step allows building each service without moving files around.
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.
Building and implementing CI/CD pipelines — This question tests Building and implementing CI/CD pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Specify the 'dir' field in the build step to point to the root. — Option C is correct because the Cloud Build step's `dir` field explicitly sets the working directory for the step. By specifying `dir: '.'` (or the repository root), Cloud Build will look for the Dockerfile in the root context, even though the build configuration file (`cloudbuild.yaml`) resides in the `build/` subdirectory. This ensures the Docker build context points to the correct location where the Dockerfile exists.
What should I do if I get this PCDOE 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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