Fix GCP Cloud Run Run Pubsub Errors

Q: How do I debug run pubsub issues in GCP Cloud Run?

Start by enabling Cloud Logging for your service. Use `gcloud logging read` to query error logs. For IAM issues, use the Policy Analyzer tool. For networking issues, use VPC flow logs. For function/run issues, check the container logs with `gcloud logging tail`. Always validate your configuration with dry-run flags before applying to production.

DodaTech Updated 2026-06-26 2 min read

When working with GCP Cloud Run, you may encounter a configuration error that prevents your deployment from working. This guide explains the most common mistake with run pubsub and shows the exact fix.

A Common Mistake

Creating a Pub/Sub push subscription pointing to a Cloud Run service but failing to configure authentication, causing push deliveries to fail with 401 errors.

The incorrect command:

gcloud pubsub subscriptions create my-sub --topic=my-topic --push-endpoint=https://my-service-xxxxx-uc.a.run.app/push

Error output:

Created subscription.
When messages are published:
Push delivery fails: 401 Unauthorized.
The Pub/Sub service cannot authenticate to the Cloud Run service. Messages are not delivered.

The Correct Approach

The right way to configure run pubsub in GCP Cloud Run:

gcloud run services add-iam-policy-binding my-service --member=serviceAccount:service-PROJECT_NUMBER@gcp-sa-pubsub.iam.gserviceaccount.com --role=roles/run.invoker --region=us-central1 && gcloud pubsub subscriptions create my-sub --topic=my-topic --push-endpoint=https://my-service-xxxxx-uc.a.run.app/push --push-auth-service-account=my-project@appspot.gserviceaccount.com

Successful result:

Created subscription with auth.
Pub/Sub push deliveries succeed. The service receives POST requests with Pub/Sub message envelopes.

How to Prevent This

Grant the Pub/Sub SA roles/run.invoker on the Cloud Run service. Use --push-auth-service-account for OIDC token authentication. The push endpoint must return 200 within 60s. Use ack-deadline for retries. Monitor undelivered messages with dead letter topics.

FAQ

Why does my run pubsub configuration fail in GCP Cloud Run?

Configuration failures in GCP Cloud Run usually stem from missing IAM permissions, incorrect parameter syntax, unfulfilled prerequisites, or incorrect API versions. Always run commands with --help first to verify parameter names and formats. Check Cloud Audit Logs for detailed error traces. The error message typically contains a link to the relevant documentation section.

How do I debug run pubsub issues in GCP Cloud Run?

Start by enabling Cloud Logging for your service. Use gcloud logging read to query error logs. For IAM issues, use the Policy Analyzer tool. For networking issues, use VPC flow logs. For function/run issues, check the container logs with gcloud logging tail. Always validate your configuration with dry-run flags before applying to production.

What are the best practices for run pubsub in GCP Cloud Run?

Use infrastructure-as-code for all configurations. Test changes in a non-production project first. Set up billing alerts. Enable Cloud Audit Logs. Follow least privilege for IAM. Review and update configurations regularly. Document manual changes for compliance audits. Monitor with dashboards and alerts.

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