GCP Associate Cloud Engineer Practice Question

Your Cloud Run service "payment-api" runs in the us-central1 region on the fully managed platform. It currently routes 100 % of traffic to revision "payment-api-00009-abc". After deploying a new revision "payment-api-00010-def" with the --no-traffic flag, you decide to start a canary release that sends 15 % of requests to the new revision and keeps the remaining traffic on the existing one. Which gcloud command meets the requirement without causing downtime?

gcloud run services update-traffic payment-api --platform managed --region us-central1 --to-revisions payment-api-00010-def=15,payment-api-00009-abc=85
gcloud run deploy payment-api --image gcr.io/myproj/payment:v2 --traffic 15 --region us-central1 --platform managed
gcloud run services update-traffic payment-api --platform managed --region us-central1 --to-latest --traffic-percent 15
gcloud run services update-traffic payment-api --platform managed --region us-central1 --to-revisions payment-api-00010-def=0.15,payment-api-00009-abc=0.85

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Answer Description

To split traffic between existing revisions you use gcloud run services update-traffic SERVICE --to-revisions and list each revision with the integer percentage of traffic it should receive. The percentages must be whole numbers that add up to 100. The correct command therefore specifies both revision IDs and their desired shares (15 and 85) and includes the --platform and --region flags for a fully managed service in us-central1.

The second choice redeploys an image and uses the --traffic flag without specifying the target revision, which would instead split traffic to a newly deployed revision-not the one that was already created with --no-traffic. The third choice tries to combine --to-latest with an invalid --traffic-percent flag and cannot set a partial split. The fourth choice provides fractional values (0.15 and 0.85); Cloud Run's CLI requires integer percentages, so the command will be rejected. Hence, only the first command accomplishes the requested 15 %/85 % split safely.

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