Fix GCP Cloud Storage Pubsub Notif Errors

Q: How do I debug pubsub notif issues in GCP Cloud Storage?

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 `gcloud compute firewall-rules list` and 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.

Q: What are the best practices for pubsub notif in GCP Cloud Storage?

Use infrastructure-as-code ( Terraform , Deployment Manager) for all configurations. Test changes in a non-production project first. Set up billing alerts to catch unexpected cost increases. Enable Cloud Audit Logs for all admin activities. Follow the principle of least privilege for IAM. Regularly review and update your configurations. Document all manual changes for compliance audits.

DodaTech Updated 2026-06-26 2 min read

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

A Common Mistake

Creating a Pub/Sub notification on a bucket but using a topic in a different project without granting publish permissions, causing notifications to be silently dropped.

The incorrect command:

gsutil notification create -t my-topic -f json gs://my-bucket

Error output:

Created notification config for gs://my-bucket.
But when objects are uploaded, no messages appear in the topic. The bucket's service agent does not have permission to publish to the topic because the topic is in a different project. GCS silently drops notifications it cannot deliver.

The Correct Approach

The right way to configure pubsub notif in GCP Cloud Storage:

gcloud projects add-iam-policy-binding topic-project --member=serviceAccount:project-1234567890@gs-project-accounts.iam.gserviceaccount.com --role=roles/pubsub.publisher && gsutil notification create -t my-topic -f json gs://my-bucket

Successful result:

Created notification config for gs://my-bucket.
Now every object creation/deletion/archive event in the bucket generates a Pub/Sub message. The storage service account has the pubsub.publisher role on the topic.

How to Prevent This

The GCS service account format is: project-{PROJECT_NUMBER}@gs-project-accounts.iam.gserviceaccount.com. Grant it roles/pubsub.publisher on the topic. Use --object-prefix to filter notifications. Use -f json for structured events. Monitor notification delivery with gcloud Pub/Sub subscriptions pull on a test subscription. Notification events include object ID, size, content type, and event type.

FAQ

Why does my pubsub notif configuration fail in GCP Cloud Storage?

Configuration failures in GCP Cloud Storage usually stem from one of these causes: 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 pubsub notif issues in GCP Cloud Storage?

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 gcloud compute firewall-rules list and 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 pubsub notif in GCP Cloud Storage?

Use infrastructure-as-code (Terraform, Deployment Manager) for all configurations. Test changes in a non-production project first. Set up billing alerts to catch unexpected cost increases. Enable Cloud Audit Logs for all admin activities. Follow the principle of least privilege for IAM. Regularly review and update your configurations. Document all manual changes for compliance audits.

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