Google Cloud Run Deployment

D.

The recommended approach to deploying an application on Cloud Run that processes messages from a Cloud Pub/Sub topic is to use a combination of Cloud Run and Cloud Pub/Sub. Specifically, the recommended approach involves creating a Cloud Pub/Sub subscription for the topic and configuring your application on Cloud Run to pull messages from that subscription. Here are the steps involved:

Option B is the correct answer: B. 1. Grant the Pub/Sub Subscriber role to the service account used by Cloud Run. 2. Create a Cloud Pub/Sub subscription for that topic. 3. Make your application pull messages from that subscription.

Step 1: Grant the Pub/Sub Subscriber role to the service account used by Cloud Run

To give your Cloud Run service permission to read messages from a Cloud Pub/Sub topic, you need to grant the appropriate role to the service account that Cloud Run uses. This role is the Pub/Sub Subscriber role. To do this, follow these steps:

• Go to the Cloud Run service in the Cloud Console.
• Click on the "Edit and Deploy New Revision" button.
• Under the "Service Account" section, click on the "Show Info Panel" button.
• In the "Identity and API Access" section, click on the "Open the service account IAM page" button.
• In the IAM console, find the service account that is associated with your Cloud Run service and add the Pub/Sub Subscriber role to it.

Step 2: Create a Cloud Pub/Sub subscription for that topic

After you have granted the Pub/Sub Subscriber role to the service account, you need to create a Cloud Pub/Sub subscription for the topic that your application will be processing messages from. To do this, follow these steps:

• Go to the Cloud Pub/Sub console in the Cloud Console.
• Find the topic that you want to subscribe to and click on it.
• Click on the "Create Subscription" button.
• In the "Create Subscription" dialog box, give your subscription a name and configure any other options that you need. Make sure to select the correct topic in the "Topic" field.
• Click on the "Create" button to create the subscription.

Step 3: Make your application pull messages from that subscription

Once you have created the subscription, you need to configure your Cloud Run service to pull messages from it. To do this, you will need to modify your application code to use the Cloud Pub/Sub client library to pull messages from the subscription. Here are the general steps:

• In your application code, use the Cloud Pub/Sub client library to create a subscriber object for the subscription that you created in Step 2.
• Use the subscriber object to start listening for messages on the subscription.
• When a message is received, process it in your application code.

By following these steps, you can deploy an application on Cloud Run that processes messages from a Cloud Pub/Sub topic in a way that follows Google-recommended practices.