- A
gcloud run revisions update-traffic ... --to-revisions=NEW=10
Why wrong: Use 'gcloud run services update-traffic' not 'revisions update-traffic'.
- B
gcloud run deploy --image ... --to-revisions=NEW=10
Why wrong: This sets traffic during deployment but the correct syntax is --to-revisions=NEW=10.
- C
gcloud run deploy --image ... --no-traffic; then gcloud run services update-traffic ... --to-revisions=NEW=10,OLD=90
This two-step approach first deploys without traffic, then adjusts traffic percentages.
- D
gcloud run deploy --image ... --traffic=10
Why wrong: There is no --traffic flag; use --to-revisions.
Question 418 of 1,000
PCDE Practice Question: Building and Implementing CI/CD Pipelines for a Service
This PCDE practice question tests your understanding of building and implementing ci/cd pipelines for a service. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 wants to deploy a containerized application to Cloud Run and gradually shift traffic from the current revision to a new revision. They want to send 10% of traffic to the new revision initially. Which command should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
✓
gcloud run deploy --image ... --no-traffic; then gcloud run services update-traffic ... --to-revisions=NEW=10,OLD=90
Option C is correct because it first deploys the new revision without any traffic using `--no-traffic`, then uses `gcloud run services update-traffic` to explicitly set 10% traffic to the new revision and 90% to the old revision. This two-step approach is required when you want to gradually shift traffic to a new revision without immediately serving any traffic to it, as Cloud Run does not support setting a specific traffic percentage directly in the `gcloud run deploy` command.
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.
- ✗
gcloud run revisions update-traffic ... --to-revisions=NEW=10
Why it's wrong here
Use 'gcloud run services update-traffic' not 'revisions update-traffic'.
- ✗
gcloud run deploy --image ... --to-revisions=NEW=10
Why it's wrong here
This sets traffic during deployment but the correct syntax is --to-revisions=NEW=10.
- ✓
gcloud run deploy --image ... --no-traffic; then gcloud run services update-traffic ... --to-revisions=NEW=10,OLD=90
Why this is correct
This two-step approach first deploys without traffic, then adjusts traffic percentages.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
gcloud run deploy --image ... --traffic=10
Why it's wrong here
There is no --traffic flag; use --to-revisions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `gcloud run deploy` can directly set a traffic percentage via a `--traffic` or `--to-revisions` flag, but Cloud Run requires a separate traffic update command after a no-traffic deployment to achieve gradual traffic shifting.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Run uses revisions as immutable snapshots of a deployment, and traffic is managed at the service level via a traffic configuration that maps percentages to revision tags or revision names. The `gcloud run deploy --no-traffic` command creates a new revision but leaves the existing traffic configuration unchanged, allowing you to later use `gcloud run services update-traffic` to gradually shift traffic using the `--to-revisions` flag, which accepts a comma-separated list of revision=percentage pairs. This pattern is essential for canary deployments or blue/green strategies where you want to validate a new revision before routing production traffic to it.
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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Building and Implementing CI/CD Pipelines for a Service — study guide chapter
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FAQ
Questions learners often ask
What does this PCDE question test?
Building and Implementing CI/CD Pipelines for a Service — This question tests Building and Implementing CI/CD Pipelines for a Service — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: gcloud run deploy --image ... --no-traffic; then gcloud run services update-traffic ... --to-revisions=NEW=10,OLD=90 — Option C is correct because it first deploys the new revision without any traffic using `--no-traffic`, then uses `gcloud run services update-traffic` to explicitly set 10% traffic to the new revision and 90% to the old revision. This two-step approach is required when you want to gradually shift traffic to a new revision without immediately serving any traffic to it, as Cloud Run does not support setting a specific traffic percentage directly in the `gcloud run deploy` command.
What should I do if I get this PCDE 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDE practice question is part of Courseiva's free Google Cloud 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 PCDE exam.
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