Check if a Compute Engine instance is preemptible

This sample checks if a given Compute Engine instance is preemptible or not.

Code sample

Go

Before trying this sample, follow the Go setup instructions in the Compute Engine quickstart using client libraries. For more information, see the Compute Engine Go API reference documentation.

To authenticate to Compute Engine, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
)

// printPreemtible prints if a given instance is preemptible or not.
func printPreemtible(w io.Writer, projectID, zone, instanceName string) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	// instanceName := "your_instance_name"

	ctx := context.Background()
	instancesClient, err := compute.NewInstancesRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewInstancesRESTClient: %w", err)
	}
	defer instancesClient.Close()

	req := &computepb.GetInstanceRequest{
		Project:  projectID,
		Zone:     zone,
		Instance: instanceName,
	}

	instance, err := instancesClient.Get(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to get instance: %w", err)
	}

	fmt.Fprintf(w, "Is instance preemptible: %v\n", instance.GetScheduling().GetPreemptible())

	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the Compute Engine quickstart using client libraries. For more information, see the Compute Engine Java API reference documentation.

To authenticate to Compute Engine, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import java.io.IOException;

public class IsPreemptible {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    // projectId: project ID or project number of the Cloud project you want to use.
    // zone: name of the zone you want to use. For example: “us-west3-b”
    // instanceName: name of the virtual machine to check.
    String projectId = "your-project-id-or-number";
    String zone = "zone-name";
    String instanceName = "instance-name";

    isPreemptible(projectId, zone, instanceName);
  }

  // Check if a given instance is preemptible or not.
  public static void isPreemptible(String projectId, String zone, String instanceName)
      throws IOException {

    try (InstancesClient instancesClient = InstancesClient.create()) {
      Instance instance = instancesClient.get(projectId, zone, instanceName);
      boolean isPreemptible = instance.getScheduling().getPreemptible();

      System.out.printf("Preemptible status: %s", isPreemptible);
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the Compute Engine quickstart using client libraries. For more information, see the Compute Engine Node.js API reference documentation.

To authenticate to Compute Engine, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const zone = 'europe-central2-b';
// const instanceName = 'YOUR_INSTANCE_NAME';

const compute = require('@google-cloud/compute');

async function printPreemptible() {
  const instancesClient = new compute.InstancesClient();

  const [instance] = await instancesClient.get({
    project: projectId,
    zone,
    instance: instanceName,
  });

  console.log(`Is instance preemptible: ${instance.scheduling.preemptible}`);
}

printPreemptible();

Python

Before trying this sample, follow the Python setup instructions in the Compute Engine quickstart using client libraries. For more information, see the Compute Engine Python API reference documentation.

To authenticate to Compute Engine, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google.cloud import compute_v1


def is_preemptible(project_id: str, zone: str, instance_name: str) -> bool:
    """
    Check if a given instance is preemptible or not.
    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone you want to use. For example: "us-west3-b"
        instance_name: name of the virtual machine to check.
    Returns:
        The preemptible status of the instance.
    """
    instance_client = compute_v1.InstancesClient()
    instance = instance_client.get(
        project=project_id, zone=zone, instance=instance_name
    )
    return instance.scheduling.preemptible

What's next

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