Careeroza

Real World Example

Zero-downtime Release at a Startup

A typical release of the ShopEase API on Google Cloud Run or Kubernetes, as done by many Indian startups:

  1. PR merged to main: CI runs lint, unit and e2e tests against a Postgres service container.
  2. CI builds the Docker image tagged with the commit SHA and pushes it to Artifact Registry (Mumbai region asia-south1).
  3. A migration job runs prisma migrate deploy. Migrations are written to be backward compatible (add a column first, remove the old one in a later release), so old and new versions can run together.
  4. The platform starts new containers; traffic shifts only after /api/health returns 200.
  5. Old containers get SIGTERM; enableShutdownHooks() lets them finish in-flight requests and close DB pools.
  6. If error rates rise, roll back to the previous image tag in one command.

Example

gcloud run deploy shopease-api --image asia-south1-docker.pkg.dev/shopease/api/api:3f9c2a7 --region asia-south1

Example output

Deploying container to Cloud Run service [shopease-api] in project [shopease] region [asia-south1]
✓ Deploying... Done.
  ✓ Creating Revision...
  ✓ Routing traffic...
Service [shopease-api] revision [shopease-api-00042-kib] has been deployed and is serving 100 percent of traffic.
Service URL: https://shopease-api-xxxxx-el.a.run.app