Introduction Cloud Build fails with QuotaExceeded when the number of concurrent builds exceeds the project quota. This blocks CI/CD pipelines and delays deployments.

Symptoms - Build status: "QuotaExceeded" or "Failed to allocate build resource" - Error: "The project does not have enough quota remaining to create this build" - Builds queued but never start - Pipeline stuck at Cloud Build step

Common Causes - Concurrent build limit reached (default varies by project) - Too many triggered builds from multiple PRs - Build timeout too long, holding quota for extended periods - Quota not requested for the region

Step-by-Step Fix 1. **Check current quota limits**: ```bash gcloud services quotas list --service=cloudbuild.googleapis.com ```

  1. 1.Request quota increase:
  2. 2.```bash
  3. 3.gcloud services quotas create --service=cloudbuild.googleapis.com --metric=cloudbuild.googleapis.com/concurrent_builds --value=50 --region=us-central1
  4. 4.`
  5. 5.Or via Cloud Console: IAM & Admin > Quotas > Cloud Build API.
  6. 6.Check running builds:
  7. 7.```bash
  8. 8.gcloud builds list --filter="status=WORKING" --limit=20
  9. 9.`
  10. 10.Cancel stuck builds to free quota:
  11. 11.```bash
  12. 12.gcloud builds list --filter="status=WORKING" --format="value(id)" | xargs -I {} gcloud builds cancel {}
  13. 13.`

Prevention - Request higher concurrency quotas before scaling CI/CD - Set appropriate build timeouts to prevent quota hoarding - Use build triggers with concurrency limits - Monitor build queue length with Cloud Monitoring - Use worker pools for dedicated build capacity