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Configure Pub/Sub notifications for Cloud Storage

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Overview

This page describes how to configure your bucket to send notifications about object changes to a Pub/Sub topic. For information on subscribing to a Pub/Sub topic that receives notifications, see Choose a subscription type.

Before using this feature, complete the following instructions.

Enable the Pub/Sub API for the project that will receive notifications.

Enable the API

To get the permissions that you need to configure and view Pub/Sub notifications for a bucket, ask your administrator to grant you the following roles. These predefined roles contain the permissions required to configure and view Pub/Sub notifications.

• Storage Admin (roles/storage.admin) role on the bucket for which you want to configure Pub/Sub notifications

• Pub/Sub Admin (roles/pubsub.admin) role on the project in which you want to receive Pub/Sub notifications

You might be able to get these permissions with other predefined roles or custom roles.

See Set and manage IAM policies on buckets for instructions on granting roles on buckets. See Controlling access for instructions on granting roles on projects and setting access controls for topics and subscriptions.

If you haven't already, create a Pub/Sub topic to which you want to send notifications. This step is not necessary if you plan on using the Google Cloud CLI or Terraform to perform the instructions on this page.

The following steps are not necessary if you plan on using the Google Cloud CLI or Terraform to perform the instructions on this page.

1. Get the email address of the service agent associated with the project that contains your Cloud Storage bucket.

2. Grant the service agent the Pub/Sub Publisher (roles/pubsub.publisher) role for the relevant Pub/Sub topic. See Controlling access for instructions on granting roles for topics.

   Note: There might be a delay of several seconds between assigning the role and having it applied to your service agent. If you grant this permission programmatically, wait 30 seconds before configuring Cloud Storage.

The following steps add a notification configuration to your bucket that sends notifications for all supported events.

You cannot manage Pub/Sub notifications with the Google Cloud console. Use the gcloud CLI or one of the available client libraries instead.

Use the gcloud storage buckets notifications create command:

gcloud storage buckets notifications create gs://BUCKET_NAME --topic=TOPIC_NAME

Where:

• BUCKET_NAME is the name of the relevant bucket. For example, my-bucket.

• TOPIC_NAME is the Pub/Sub topic to send notifications to. If you specify a topic that doesn't exist in your project, the command creates one for you.

To send notifications for a subset of events, include the --event-types flag.

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

You can use a Terraform resource to add a notification configuration to a bucket.

To get a specific notification configuration that's associated with your bucket, complete the following steps:

You cannot manage Pub/Sub notifications with the Google Cloud console. Use the Google Cloud CLI or one of the available client libraries instead.

Use the gcloud storage buckets notifications describe command:

gcloud storage buckets notifications describe projects/_/buckets/BUCKET_NAME/notificationConfigs/NOTIFICATION_ID

Where:

• BUCKET_NAME is the name of the bucket whose notification configuration you want to retrieve For example, my-bucket.

• NOTIFICATION_ID is the ID number of the relevant configuration. For example, 5.

If successful, the response looks similar to the following example:

etag: '132'
id: '132'
kind: storage#notification
payload_format: JSON_API_V1
selfLink: https://www.googleapis.com/storage/v1/b/my-bucket/notificationConfigs/132
topic: //pubsub.googleapis.com/projects/my-project/topics/my-bucket

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To list all the notification configurations associated with a particular bucket:

You cannot manage Pub/Sub notifications with the Google Cloud console. Use the gcloud CLI or one of the available client libraries instead.

Use the gcloud storage buckets notifications list command:

gcloud storage buckets notifications list gs://BUCKET_NAME

Where BUCKET_NAME is the name of the bucket whose notification configurations you want to list. For example, my-bucket.

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To remove an existing notification configuration from your bucket:

You cannot manage Pub/Sub notifications with the Google Cloud console. Use the gcloud CLI or one of the available client libraries instead.

Use the gcloud storage buckets notifications delete command:

gcloud storage buckets notifications delete projects/_/buckets/BUCKET_NAME/notificationConfigs/NOTIFICATION_ID

Where:

• BUCKET_NAME is the name of the bucket whose notification configuration you want to delete. For example, my-bucket.

• NOTIFICATION_ID is the ID number of the configuration you want to delete. For example, 5.

If successful, the response looks similar to the following example:

Completed 1

Once sent, it might take up to 30 seconds for all notifications triggered by the notification configuration to stop.

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

To remove the notification configuration you created, run terraform destroy from the folder containing your Terraform file.

1. Have gcloud CLI installed and initialized, which lets you generate an access token for the Authorization header.

2. Use cURL to call the JSON API with a DELETE notificationConfigs request:

   curl -X DELETE \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     "https://storage.googleapis.com/storage/v1/b/BUCKET_NAME/notificationConfigs/NOTIFICATION_ID"

   Where:

   • BUCKET_NAME is the name of the bucket whose notification configuration you want to delete. For example, my-bucket.

   • NOTIFICATION_ID is the ID number of the notification configuration you want to delete. For example, 5.

Once sent, it may take up to 30 seconds for all notifications triggered by the notification configuration to stop.

You cannot manage Pub/Sub notifications with the XML API.

• Learn more about Pub/Sub notifications for Cloud Storage.

• Create a subscription in Pub/Sub to view notifications sent by Cloud Storage.

• See a Python example app that polls for notifications on GitHub.

• Use Cloud Run functions to deliver events with a Cloud Storage trigger.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-10-02 UTC.

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