Create a Cloud Function on GCP Console and Make an HTTP Request to a VM

Create a Cloud Function in GCP Console to Make an HTTP Request to a VM

Google Cloud Platform (GCP) offers a variety of services to help developers build, deploy, and manage applications in the cloud. One such service is Cloud Functions, which allows you to run small pieces of code in response to events. In this article, we will show you how to create a Cloud Function in the GCP Console that makes an HTTP request to a virtual machine (VM).

What is a Cloud Function?

A Cloud Function is a small, single-purpose function that is executed in response to an event. Events can come from a variety of sources, such as changes to data in Cloud Storage, messages in Cloud Pub/Sub, or HTTP requests. Cloud Functions are designed to be short-lived and stateless, making them an ideal choice for tasks such as data processing, automation, and integrating with other services.

Why Make an HTTP Request to a VM?

There are many reasons why you might want to make an HTTP request to a VM from a Cloud Function. For example, you might want to:

• Trigger a script or application running on the VM
• Retrieve data from the VM
• Invoke a service running on the VM

Creating a Cloud Function in the GCP Console

To create a Cloud Function in the GCP Console, follow these steps:

1. Go to the Cloud Functions page in the GCP Console.
2. Click the Create function button.
3. Enter a name for your function, such as vm-http-request.
4. Select a region and runtime for your function. For this example, we will use the us-central1 region and the Node.js 10 runtime.
5. In the Trigger section, select HTTP as the trigger type.
6. In the Source code section, select Inline editor as the source code type.
7. In the inline editor, enter the following code:
   exports.vmHttpRequest = (req, res) => { const https = require('https'); const options = { host: 'YOUR_VM_IP_ADDRESS', path: '/', method: 'GET' }; const req = https.request(options, (res) => { console.log(`statusCode: ${res.statusCode}`); res.on('data', (d) => { process.stdout.write(d); }); }); req.on('error', (error) => { console.error(error); }); req.end(); res.status(200).send('Request sent to VM'); };

   Replace YOUR_VM_IP_ADDRESS with the IP address of your VM.

8. Click the Create button to create your Cloud Function.

Testing the Cloud Function

To test the Cloud Function, follow these steps:

1. Go to the Cloud Functions page in the GCP Console.
2. Click on the name of your Cloud Function.
3. Click the Test function button.
4. In the Request body field, enter an empty JSON object:
   {}

5. Click the Test button.
6. After the Cloud Function has finished executing, you should see a message in the Response body field indicating that the request was sent to the VM:
   Request sent to VM

7. You can also check the logs for your Cloud Function to see the status code of the HTTP request:
   gcloud functions logs read vm-http-request

   In this article, we have shown you how to create a Cloud Function in the GCP Console that makes an HTTP request to a virtual machine. Cloud Functions are a powerful tool for automating tasks, integrating with other services, and processing data in the cloud. By making HTTP requests to VMs, you can extend the functionality of your Cloud Functions and build more complex applications in the cloud.

   References

   • Cloud Functions
   • What are Cloud Functions?
   • Calling Cloud Functions with HTTP
   • HTTPS module