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Terraform Pub/Sub Tutorial | Cloud Run functions Documentation

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This tutorial demonstrates how to deploy a Pub/Sub function by uploading a function source code zip file to a Cloud Storage bucket, using Terraform to provision the resources. Terraform is an open source tool that lets you provision Google Cloud resources with declarative configuration files

This tutorial uses a Node.js function as an example, but it also works with Python, Go, and Java functions. The instructions are the same regardless of which of these runtimes you are using. See Hashicorp's reference pages for details on using Terraform with the Cloud Functions v2 API.

• Learn how to use Terraform to deploy a Pub/Sub function.

In this document, you use the following billable components of Google Cloud:

• Cloud Run functions
• Cloud Build
• Cloud Storage
• Artifact Registry

For details, see Cloud Run functions pricing.

To generate a cost estimate based on your projected usage, use the pricing calculator.

New Google Cloud users might be eligible for a

.

1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

3. Verify that billing is enabled for your Google Cloud project.

4. Enable the Cloud Functions, Cloud Build, Artifact Registry, and Cloud Storage APIs.

   Enable the APIs

5. Install the Google Cloud CLI.

6. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

7. To initialize the gcloud CLI, run the following command:

   gcloud init

8. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

9. Verify that billing is enabled for your Google Cloud project.

10. Enable the Cloud Functions, Cloud Build, Artifact Registry, and Cloud Storage APIs.

    Enable the APIs

11. Install the Google Cloud CLI.

12. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

13. To initialize the gcloud CLI, run the following command:

    gcloud init

If you already have the gcloud CLI installed, update it by running the following command:

gcloud components update

14. Grant roles/run.invoker and the roles/cloudbuild.builds.builder to the default compute service account.
15. Prepare your development environment.

    Go to the Node.js setup guide

In this tutorial, you run commands in Cloud Shell. Cloud Shell is a shell environment with the Google Cloud CLI already installed, including the Google Cloud CLI, and with values already set for your current project. Cloud Shell can take several minutes to initialize:

Open Cloud Shell

In Cloud Shell, perform the following steps:

1. Clone the sample app repository to your Cloud Shell instance:

   git clone https://github.com/terraform-google-modules/terraform-docs-samples.git

2. Change to the directory that contains the Cloud Run functions sample code:

   cd terraform-docs-samples/functions/pubsub

   The Node.js sample used in this tutorial is a basic "Hello World" Pub/Sub function. Here is the main.tf file:

In the terraform-docs-samples/functions/pubsub directory containing the main.tf file, run this command to add the necessary plugins and build the .terraform directory:

terraform init

Preview the Terraform configuration. This step is optional, but it lets you verify that the syntax of main.tf is correct. This command shows a preview of the resources that will be created:

terraform plan

Deploy the function by applying the configuration. When prompted, enter yes:

terraform apply

To test the Pub/Sub function:

1. Publish a message to the topic (in this example, the topic name is functions2-topic):

   gcloud pubsub topics publish TOPIC_NAME --message="Friend"

2. Read the function logs to see the result, where FUNCTION_NAME is the name of your function (in this example, the function name is function):

   gcloud functions logs read FUNCTION_NAME

   You should see logging output that includes your new "Friend" message.

   Note: Logs might take a few moments to appear. If you don't see them immediately, check again in a minute or two.

After completing the tutorial, you can delete everything that you created so that you don't incur any further costs.

Terraform lets you remove all the resources defined in the configuration file by running the terraform destroy command:

terraform destroy

Enter yes to allow Terraform to delete your resources.

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 2025-08-07 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["This tutorial guides you through deploying a Pub/Sub function using Terraform, which involves uploading a function's source code zip file to a Cloud Storage bucket."],["The process works for Node.js, Python, Go, and Java functions, with the instructions remaining consistent across these different runtimes."],["You will need to set up your environment using Cloud Shell, prepare your function application by cloning the sample and creating a zip file of its source code, create a main.tf file to configure terraform, and apply the configuration."],["The deployed Pub/Sub function can be tested by publishing a message to the specified topic, and then reading the function logs to verify the function's response to the message."],["You can remove all the resources created during the tutorial using the `terraform destroy` command to avoid incurring further costs."]]],[]]

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