Create and deploy a Cloud Function (1st gen) by using the Google Cloud CLI

Create and deploy a Cloud Function (1st gen) by using the Google Cloud CLI

Note: This content applies only to Cloud Functions (1st gen). See Cloud Functions version comparison for more information.

For the 2nd gen version of this document, see Create and deploy a Cloud Function (2nd gen).

This page shows you how to create and deploy a 1st gen Cloud Function using the Google Cloud CLI.

Before you begin

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. Make sure that billing is enabled for your Cloud project. Learn how to check if billing is enabled on a project.

4. Enable the Cloud Functions and Cloud Build APIs.

   Enable the APIs

5. 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

6. Make sure that billing is enabled for your Cloud project. Learn how to check if billing is enabled on a project.

7. Enable the Cloud Functions and Cloud Build APIs.

   Enable the APIs

8. Install and initialize the gcloud CLI.
9. Update gcloud components:

   gcloud components update

Need a command prompt? You can use the Google Cloud Shell. The Google Cloud Shell is a command line environment that already includes the Google Cloud CLI, so you don't need to install it. The Google Cloud CLI also comes preinstalled on Google Compute Engine Virtual Machines.

10. Prepare your development environment.

    Node.js

    Go to the Node.js setup guide

    Python

    Go to the Python setup guide

    Go

    Go to the Go setup guide

    Java

    Go to the Java setup guide

    C#

    Go to the .NET setup guide

    Ruby

    Go to the Ruby setup guide

    PHP

    Go to Using PHP on Google Cloud

Get the sample code

1. Clone the sample repository to your local machine:

   Node.js

   git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   Python

   git clone https://github.com/GoogleCloudPlatform/python-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   Go

   git clone https://github.com/GoogleCloudPlatform/golang-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   Java

   git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   C#

   git clone https://github.com/GoogleCloudPlatform/dotnet-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   Ruby

   git clone https://github.com/GoogleCloudPlatform/ruby-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

   PHP

   git clone https://github.com/GoogleCloudPlatform/php-docs-samples.git

   Alternatively, you can download the sample as a zip file and extract it.

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

   Node.js

   cd nodejs-docs-samples/functions/helloworld/

   Python

   cd python-docs-samples/functions/helloworld/

   Go

   cd golang-samples/functions/helloworld/

   Java

   cd java-docs-samples/functions/helloworld/helloworld/

   C#

   cd dotnet-docs-samples/functions/helloworld/HelloWorld/

   Ruby

   cd ruby-docs-samples/functions/helloworld/get/

   PHP

   cd php-docs-samples/functions/helloworld_get/

3. Take a look at the sample code:

   Node.js

   functions/helloworld/helloworldGet/index.js

   View on GitHub Feedback

   const functions = require('@google-cloud/functions-framework');
   
   // Register an HTTP function with the Functions Framework that will be executed
   // when you make an HTTP request to the deployed function's endpoint.
   functions.http('helloGET', (req, res) => {
     res.send('Hello World!');
   });

   Python

   functions/helloworld/main.py

   View on GitHub Feedback

   import functions_framework
   
   @functions_framework.http
   def hello_get(request):
       """HTTP Cloud Function.
       Args:
           request (flask.Request): The request object.
           <https://flask.palletsprojects.com/en/1.1.x/api/#incoming-request-data>
       Returns:
           The response text, or any set of values that can be turned into a
           Response object using `make_response`
           <https://flask.palletsprojects.com/en/1.1.x/api/#flask.make_response>.
       Note:
           For more information on how Flask integrates with Cloud
           Functions, see the `Writing HTTP functions` page.
           <https://cloud.google.com/functions/docs/writing/http#http_frameworks>
       """
       return 'Hello World!'

   Go

   functions/helloworld/hello_world.go

   View on GitHub Feedback

   
   // Package helloworld provides a set of Cloud Functions samples.
   package helloworld
   
   import (
   	"fmt"
   	"net/http"
   )
   
   // HelloGet is an HTTP Cloud Function.
   func HelloGet(w http.ResponseWriter, r *http.Request) {
   	fmt.Fprint(w, "Hello, World!")
   }
   

   Java

   functions/helloworld/helloworld/src/main/java/functions/HelloWorld.java

   View on GitHub Feedback

   
   package functions;
   
   import com.google.cloud.functions.HttpFunction;
   import com.google.cloud.functions.HttpRequest;
   import com.google.cloud.functions.HttpResponse;
   import java.io.BufferedWriter;
   import java.io.IOException;
   
   public class HelloWorld implements HttpFunction {
     // Simple function to return "Hello World"
     @Override
     public void service(HttpRequest request, HttpResponse response)
         throws IOException {
       BufferedWriter writer = response.getWriter();
       writer.write("Hello World!");
     }
   }

   C#

   functions/helloworld/HelloWorld/Function.cs

   View on GitHub Feedback

   using Google.Cloud.Functions.Framework;
   using Microsoft.AspNetCore.Http;
   using System.Threading.Tasks;
   
   namespace HelloWorld;
   
   public class Function : IHttpFunction
   {
       public async Task HandleAsync(HttpContext context)
       {
           await context.Response.WriteAsync("Hello World!");
       }
   }

   Ruby

   functions/helloworld/get/app.rb

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   require "functions_framework"
   
   FunctionsFramework.http "hello_get" do |_request|
     # The request parameter is a Rack::Request object.
     # See https://www.rubydoc.info/gems/rack/Rack/Request
   
     # Return the response body as a string.
     # You can also return a Rack::Response object, a Rack response array, or
     # a hash which will be JSON-encoded into a response.
     "Hello World!"
   end

   PHP

   functions/helloworld_get/index.php

   View on GitHub Feedback

   
   use Psr\Http\Message\ServerRequestInterface;
   
   function helloGet(ServerRequestInterface $request): string
   {
       return 'Hello, World!' . PHP_EOL;
   }
   

Deploy a function

To deploy the function with an HTTP trigger, run the following command in the directory containing your function:

Node.js

gcloud functions deploy helloGET \
--runtime nodejs18 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred Node.js version:

• nodejs18 (recommended)
• nodejs16
• nodejs14
• nodejs12
• nodejs10

Python

gcloud functions deploy hello_get \
--runtime python311 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred Python version:

• python311 (recommended)
• python310
• python39
• python38
• python37

Go

gcloud functions deploy HelloGet \
--runtime go120 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred Go version:

• go120 (recommended)
• go119
• go118
• go116
• go113

Java

gcloud functions deploy java-helloworld \
--entry-point functions.HelloWorld \
--runtime java17 \
--memory 512MB --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred Java version:

• java17 (recommended)
• java11

C#

gcloud functions deploy csharp-helloworld \
--entry-point HelloWorld.Function \
--runtime dotnet6 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred .NET version:

• dotnet6 (recommended)
• dotnet3

Ruby

gcloud functions deploy hello_get --runtime ruby30 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred Ruby version:

• ruby30 (recommended)
• ruby32 (preview)
• ruby27
• ruby26

PHP

gcloud functions deploy helloGet --runtime php81 --trigger-http --allow-unauthenticated

You can use the following values for the --runtime flag to specify your preferred PHP version:

• php81 (recommended)
• php74

The --allow-unauthenticated flag lets you reach the function without authentication. To require authentication, omit the flag.

Test the function

1. When the function finishes deploying, take note of the httpsTrigger's url property or find it using the following command:

   Node.js

   gcloud functions describe helloGET

   Python

   gcloud functions describe hello_get

   Go

   gcloud functions describe HelloGet

   Java

   gcloud functions describe java-helloworld

   C#

   gcloud functions describe csharp-helloworld

   Ruby

   gcloud functions describe hello_get

   PHP

   gcloud functions describe helloGet

   It should look like this:

   Node.js

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/helloGET

   Python

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/hello_get

   Go

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/HelloGet

   Java

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/java-helloworld

   C#

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/csharp-helloworld

   Ruby

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/hello_get

   PHP

   https://GCP_REGION-PROJECT_ID.cloudfunctions.net/helloGet

2. Visit this URL in your browser. You should see a Hello World! message.

Delete the function

To delete the function, run the following command:

Node.js

gcloud functions delete helloGET 

Python

gcloud functions delete hello_get 

Go

gcloud functions delete HelloGet 

Java

gcloud functions delete java-helloworld 

C#

gcloud functions delete csharp-helloworld 

Ruby

gcloud functions delete hello_get 

PHP

gcloud functions delete helloGet 

What's next

See the relevant Your First Function guide for the runtime of your choice to learn how to set up your development environment, create a new function from scratch, specify dependencies, deploy your function, test your function, and view logs. Note that these guides are for Cloud Functions (1st gen) only:

• Your First Function: Node.js
• Your First Function: Python
• Your First Function: Go
• Your First Function: Java
• Your First Function: .NET
• Your First Function: Ruby
• Your First Function: PHP