The answer is that the Cloud Build service account lacks the Kubernetes Engine Developer IAM role. This is the most likely cause of a cloud build gke deployment authorization error because Cloud Build uses its default service account to execute build steps, and deploying to GKE requires authenticating to the cluster’s Kubernetes API. Without the roles/container.developer permission, the service account cannot create or manage workloads, triggering a failed deployment step. On the Google Professional Cloud DevOps Engineer exam, this scenario tests your understanding of IAM role scoping and the principle of least privilege—a common trap is assuming the default Compute Engine service account is used, or that the error stems from a misconfigured cluster. Remember that Cloud Build’s service account must be explicitly granted container.developer, not just storage or compute roles. Memory tip: think “Build needs Developer” to recall that Cloud Build requires the Kubernetes Engine Developer role for GKE deployments.
PCDOE Practice Question: Bootstrapping a Google Cloud organization for DevOps
This PCDOE practice question tests your understanding of bootstrapping a google cloud organization for devops. 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 DevOps team wants to automate the deployment of a microservice application to Google Kubernetes Engine (GKE) using Cloud Build. They have a Cloud Build configuration file that builds a container image and deploys it to GKE. However, the deployment step fails with an authorization error. 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 Cloud Build service account does not have the Kubernetes Engine Developer IAM role.
Cloud Build uses a default service account (the Cloud Build service account) to execute build steps, including deploying to GKE. The Kubernetes Engine Developer IAM role (roles/container.developer) grants the necessary permissions to deploy and manage workloads on GKE clusters. Without this role, the Cloud Build service account cannot authenticate to the GKE cluster's Kubernetes API, resulting in an authorization error during the deployment step.
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 Cloud Build service account does not have the Kubernetes Engine Developer IAM role.
Why this is correct
To deploy to GKE, the service account needs roles/container.developer or roles/container.clusterAdmin.
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 user triggering the build does not have IAM permissions to deploy to GKE.
Why it's wrong here
Cloud Build uses its own service account, not the user's identity.
✗
Cloud Build does not have permission to access the source code repository.
Why it's wrong here
The build step succeeded, so source access is fine.
✗
The Docker image build step failed due to missing dependencies.
Why it's wrong here
The error occurs in the deployment step, not the build step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between the identity that triggers a build (user) and the identity that executes build steps (Cloud Build service account), leading candidates to incorrectly blame user permissions when the service account lacks the necessary Kubernetes Engine IAM role.
Detailed technical explanation
How to think about this question
Cloud Build's default service account is `[PROJECT_NUMBER]@cloudbuild.gserviceaccount.com` and must be granted the `container.developer` role on the GKE cluster or at the project level to interact with the Kubernetes API. Under the hood, Cloud Build uses `kubectl` or `gcloud container clusters get-credentials` to authenticate, which relies on the service account's IAM permissions to generate a kubeconfig token. In real-world scenarios, teams often forget to grant this role after creating a new GKE cluster or when using a custom Cloud Build service account, leading to cryptic authorization errors.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Bootstrapping a Google Cloud organization for DevOps — This question tests Bootstrapping a Google Cloud organization for DevOps — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Cloud Build service account does not have the Kubernetes Engine Developer IAM role. — Cloud Build uses a default service account (the Cloud Build service account) to execute build steps, including deploying to GKE. The Kubernetes Engine Developer IAM role (roles/container.developer) grants the necessary permissions to deploy and manage workloads on GKE clusters. Without this role, the Cloud Build service account cannot authenticate to the GKE cluster's Kubernetes API, resulting in an authorization error during the deployment step.
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.
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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