- A
gcloud run deploy --image ... --canary-percent=5
Why wrong: There is no `--canary-percent` flag; traffic splitting is done via `--to-revisions`.
- B
gcloud run deploy --image ... --traffic=5
Why wrong: `--traffic` flag does not exist; use `--to-revisions`.
- C
gcloud run deploy --image ... --to-revisions=REVISION_1=95,REVISION_2=5
Correct: uses `--to-revisions` to split traffic.
- D
gcloud run deploy --image ... --min-instances=1 --max-instances=10
Why wrong: These flags control scaling, not traffic splitting.
Question 219 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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Cloud Run and wants to deploy a new revision that initially receives 5% of traffic, and only if it's healthy, gradually increase to 100%. Which gcloud command should they use?
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 ... --to-revisions=REVISION_1=95,REVISION_2=5
Option C is correct because the `gcloud run deploy` command with the `--to-revisions` flag allows you to specify the exact traffic split between existing revisions and the new revision. By setting `REVISION_1=95,REVISION_2=5`, the new revision (REVISION_2) initially receives 5% of traffic, and Cloud Run's built-in gradual rollout mechanism will automatically increase its traffic share to 100% only if it remains healthy, based on the configured health checks.
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 deploy --image ... --canary-percent=5
Why it's wrong here
There is no `--canary-percent` flag; traffic splitting is done via `--to-revisions`.
- ✗
gcloud run deploy --image ... --traffic=5
Why it's wrong here
`--traffic` flag does not exist; use `--to-revisions`.
- ✓
gcloud run deploy --image ... --to-revisions=REVISION_1=95,REVISION_2=5
Why this is correct
Correct: uses `--to-revisions` to split traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
gcloud run deploy --image ... --min-instances=1 --max-instances=10
Why it's wrong here
These flags control scaling, not traffic splitting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the `--traffic` flag (which sets the overall traffic percentage for the service, not per-revision) with the `--to-revisions` flag (which is the correct way to specify per-revision traffic splits for canary deployments). Additionally, note that the command only sets the initial traffic split; the gradual increase to 100% must be managed separately by updating the traffic configuration over time.
Detailed technical explanation
How to think about this question
Cloud Run uses a traffic management system based on revision-level routing, where each revision can be assigned a percentage of traffic via the `--to-revisions` flag. The gradual rollout is achieved by Cloud Run's internal health-checking mechanism: if the new revision fails health checks (e.g., HTTP 500 errors or timeout), the rollout automatically stops and rolls back to the previous revision. This is distinct from a simple static traffic split, as the platform monitors the revision's readiness and liveness probes to determine if the traffic increase should proceed.
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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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 ... --to-revisions=REVISION_1=95,REVISION_2=5 — Option C is correct because the `gcloud run deploy` command with the `--to-revisions` flag allows you to specify the exact traffic split between existing revisions and the new revision. By setting `REVISION_1=95,REVISION_2=5`, the new revision (REVISION_2) initially receives 5% of traffic, and Cloud Run's built-in gradual rollout mechanism will automatically increase its traffic share to 100% only if it remains healthy, based on the configured health checks.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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