Resume a suspended VM in the specified project and zone.

## Explore further


For detailed documentation that includes this code sample, see the following:

- [Suspend or resume a Compute Engine instance](https://docs.cloud.google.com/compute/docs/instances/suspend-resume-instance)

## Code sample

### Go


Before trying this sample, follow the Go setup instructions in the
[Compute Engine quickstart using
client libraries](https://docs.cloud.google.com/compute/docs/api/using-libraries).


For more information, see the
[Compute Engine Go API
reference documentation](https://docs.cloud.google.com/go/docs/reference/cloud.google.com/go/compute/latest/apiv1).


To authenticate to Compute Engine, set up Application Default Credentials.
For more information, see

[Set up authentication for a local development environment](https://docs.cloud.google.com/docs/authentication/set-up-adc-local-dev-environment).

    import (
    	"context"
    	"fmt"
    	"io"

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

    // resumeInstance resumes a suspended Google Compute Engine instance
    // (with unencrypted disks).
    func resumeInstance(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.https://docs.cloud.google.com/go/docs/reference/cloud.google.com/go/compute/latest/apiv1.html#cloud_google_com_go_compute_apiv1_InstancesClient_NewInstancesRESTClient(ctx)
    	if err != nil {
    		return fmt.Errorf("NewInstancesRESTClient: %w", err)
    	}
    	defer instancesClient.Close()

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

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

    	if instance.GetStatus() != "SUSPENDED" {
    		return fmt.Errorf(
    			"only suspended instances can be resumed, instance %s is in %s state",
    			instanceName,
    			instance.GetStatus(),
    		)
    	}

    	resumeInstanceReq := &computepb.ResumeInstanceRequest{
    		Project:  projectID,
    		Zone:     zone,
    		Instance: instanceName,
    	}

    	op, err := instancesClient.Resume(ctx, resumeInstanceReq)
    	if err != nil {
    		return fmt.Errorf("unable to resume instance: %w", err)
    	}

    	if err = op.Wait(ctx); err != nil {
    		return fmt.Errorf("unable to wait for the operation: %w", err)
    	}

    	fmt.Fprintf(w, "Instance resumed\n")

    	return nil
    }

### Java


Before trying this sample, follow the Java setup instructions in the
[Compute Engine quickstart using
client libraries](https://docs.cloud.google.com/compute/docs/api/using-libraries).


For more information, see the
[Compute Engine Java API
reference documentation](https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/overview).


To authenticate to Compute Engine, set up Application Default Credentials.
For more information, see

[Set up authentication for a local development environment](https://docs.cloud.google.com/docs/authentication/set-up-adc-local-dev-environment).


    import com.google.cloud.compute.v1.https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Instance.html.https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Status.html;
    import com.google.cloud.compute.v1.https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.InstancesClient.html;
    import com.google.cloud.compute.v1.https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Operation.html;
    import java.io.IOException;
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.TimeUnit;
    import java.util.concurrent.TimeoutException;

    public class ResumeInstance {

      public static void main(String[] args)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
        // TODO(developer): Replace these variables before running the sample.
        // project: project ID or project number of the Cloud project your instance belongs to.
        // zone: name of the zone your instance belongs to.
        // instanceName: name of the instance your want to resume.

        String project = "your-project-id";
        String zone = "zone-name";
        String instanceName = "instance-name";

        resumeInstance(project, zone, instanceName);
      }

      // Resume a suspended Google Compute Engine instance (with unencrypted disks).
      // Instance state changes to RUNNING, if successfully resumed.
      public static void resumeInstance(String project, String zone, String instanceName)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
        // Instantiates a client.
        try (https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.InstancesClient.html instancesClient = https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.InstancesClient.html.create()) {

          String currentInstanceState = instancesClient.get(project, zone, instanceName).getStatus();

          // Check if the instance is currently suspended.
          if (!currentInstanceState.equalsIgnoreCase(https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Status.html.SUSPENDED.toString())) {
            throw new RuntimeException(
                String.format("Only suspended instances can be resumed. Instance %s is in %s state.",
                    instanceName, currentInstanceState));
          }

          https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Operation.html operation = instancesClient.resumeAsync(project, zone, instanceName)
              .get(300, TimeUnit.SECONDS);

          if (operation.https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Operation.html#com_google_cloud_compute_v1_Operation_hasError__() || !instancesClient.get(project, zone, instanceName).getStatus()
              .equalsIgnoreCase(
                  https://docs.cloud.google.com/java/docs/reference/google-cloud-compute/latest/com.google.cloud.compute.v1.Status.html.RUNNING.toString())) {
            System.out.println("Cannot resume instance. Try again!");
            return;
          }

          System.out.printf("Instance resumed successfully ! %s", instanceName);
        }
      }
    }

### Node.js


Before trying this sample, follow the Node.js setup instructions in the
[Compute Engine quickstart using
client libraries](https://docs.cloud.google.com/compute/docs/api/using-libraries).


For more information, see the
[Compute Engine Node.js API
reference documentation](https://docs.cloud.google.com/nodejs/docs/reference/compute/latest).


To authenticate to Compute Engine, set up Application Default Credentials.
For more information, see

[Set up authentication for a local development environment](https://docs.cloud.google.com/docs/authentication/set-up-adc-local-dev-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('https://docs.cloud.google.com/nodejs/docs/reference/compute/latest/overview.html');

    // Resumes a suspended Google Compute Engine instance (with unencrypted disks).
    async function resumeInstance() {
      const instancesClient = new compute.https://docs.cloud.google.com/nodejs/docs/reference/compute/latest/overview.html();

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

      if (instance.status !== 'SUSPENDED') {
        throw new Error(
          'Only suspended instances can be resumed.' +
            `Instance ${instanceName} is in ${instance.status} state.`
        );
      }

      const [response] = await instancesClient.resume({
        project: projectId,
        zone,
        instance: instanceName,
      });
      let operation = response.latestResponse;
      const operationsClient = new compute.https://docs.cloud.google.com/nodejs/docs/reference/compute/latest/overview.html();

      // Wait for the create operation to complete.
      while (operation.status !== 'DONE') {
        [operation] = await operationsClient.wait({
          operation: operation.name,
          project: projectId,
          zone: operation.zone.split('/').pop(),
        });
      }

      console.log('Instance resumed.');
    }

    resumeInstance();

### PHP


Before trying this sample, follow the PHP setup instructions in the
[Compute Engine quickstart using
client libraries](https://docs.cloud.google.com/compute/docs/api/using-libraries).


For more information, see the
[Compute Engine PHP API
reference documentation](https://docs.cloud.google.com/php/docs/reference/cloud-compute/latest).


To authenticate to Compute Engine, set up Application Default Credentials.
For more information, see

[Set up authentication for a local development environment](https://docs.cloud.google.com/docs/authentication/set-up-adc-local-dev-environment).

    use Google\Cloud\Compute\V1\Client\InstancesClient;
    use Google\Cloud\Compute\V1\ResumeInstanceRequest;

    /**
     * Resume a suspended Google Compute Engine instance (with unencrypted disks).
     *
     * @param string $projectId Project ID or project number of the Cloud project your instance belongs to.
     * @param string $zone Name of the zone your instance belongs to.
     * @param string $instanceName Name of the instance you want to resume.
      *
     * @throws \Google\ApiCore\ApiException if the remote call fails.
     * @throws \Google\ApiCore\ValidationException if local error occurs before remote call.
     */
    function resume_instance(
        string $projectId,
        string $zone,
        string $instanceName
    ) {
        // Resume the suspended Compute Engine instance using InstancesClient.
        $instancesClient = new InstancesClient();
        $request = (new ResumeInstanceRequest())
            ->setInstance($instanceName)
            ->setProject($projectId)
            ->setZone($zone);
        $operation = $instancesClient->resume($request);

        // Wait for the operation to complete.
        $operation->pollUntilComplete();
        if ($operation->operationSucceeded()) {
            printf('Instance %s resumed successfully' . PHP_EOL, $instanceName);
        } else {
            $error = $operation->getError();
            printf('Failed to resume instance: %s' . PHP_EOL, $error?->getMessage());
        }
    }

### Python


Before trying this sample, follow the Python setup instructions in the
[Compute Engine quickstart using
client libraries](https://docs.cloud.google.com/compute/docs/api/using-libraries).


For more information, see the
[Compute Engine Python API
reference documentation](https://docs.cloud.google.com/python/docs/reference/compute/latest).


To authenticate to Compute Engine, set up Application Default Credentials.
For more information, see

[Set up authentication for a local development environment](https://docs.cloud.google.com/docs/authentication/set-up-adc-local-dev-environment).

    from __future__ import annotations

    import sys
    from typing import Any

    from google.api_core.extended_operation import ExtendedOperation
    from google.cloud import https://docs.cloud.google.com/python/docs/reference/compute/latest


    def wait_for_extended_operation(
        operation: ExtendedOperation, verbose_name: str = "operation", timeout: int = 300
    ) -> Any:
        """
        Waits for the extended (long-running) operation to complete.

        If the operation is successful, it will return its result.
        If the operation ends with an error, an exception will be raised.
        If there were any warnings during the execution of the operation
        they will be printed to sys.stderr.

        Args:
            operation: a long-running operation you want to wait on.
            verbose_name: (optional) a more verbose name of the operation,
                used only during error and warning reporting.
            timeout: how long (in seconds) to wait for operation to finish.
                If None, wait indefinitely.

        Returns:
            Whatever the operation.result() returns.

        Raises:
            This method will raise the exception received from `operation.exception()`
            or RuntimeError if there is no exception set, but there is an `error_code`
            set for the `operation`.

            In case of an operation taking longer than `timeout` seconds to complete,
            a `concurrent.futures.TimeoutError` will be raised.
        """
        result = operation.result(timeout=timeout)

        if operation.error_code:
            print(
                f"Error during {verbose_name}: [Code: {operation.error_code}]: {operation.error_message}",
                file=sys.stderr,
                flush=True,
            )
            print(f"Operation ID: {operation.name}", file=sys.stderr, flush=True)
            raise operation.exception() or RuntimeError(operation.error_message)

        if operation.warnings:
            print(f"Warnings during {verbose_name}:\n", file=sys.stderr, flush=True)
            for warning in operation.warnings:
                print(f" - {warning.code}: {warning.message}", file=sys.stderr, flush=True)

        return result


    def resume_instance(project_id: str, zone: str, instance_name: str) -> None:
        """
        Resume a suspended Google Compute Engine instance (with unencrypted disks).
        Args:
            project_id: project ID or project number of the Cloud project your instance belongs to.
            zone: name of the zone your instance belongs to.
            instance_name: name of the instance you want to resume.
        """
        instance_client = https://docs.cloud.google.com/python/docs/reference/compute/latest.https://docs.cloud.google.com/python/docs/reference/compute/latest/google.cloud.compute_v1.services.instances.InstancesClient.html()

        instance = instance_client.https://docs.cloud.google.com/python/docs/reference/compute/latest/google.cloud.compute_v1.services.instances.InstancesClient.html#google_cloud_compute_v1_services_instances_InstancesClient_get(
            project=project_id, zone=zone, instance=instance_name
        )
        if instance.status != https://docs.cloud.google.com/python/docs/reference/compute/latest.https://docs.cloud.google.com/python/docs/reference/compute/latest/google.cloud.compute_v1.types.Instance.html.Status.SUSPENDED.name:
            raise RuntimeError(
                f"Only suspended instances can be resumed. "
                f"Instance {instance_name} is in {instance.status} state."
            )

        operation = instance_client.https://docs.cloud.google.com/python/docs/reference/compute/latest/google.cloud.compute_v1.services.instances.InstancesClient.html#google_cloud_compute_v1_services_instances_InstancesClient_resume(
            project=project_id, zone=zone, instance=instance_name
        )

        wait_for_extended_operation(operation, "instance resumption")

## What's next


To search and filter code samples for other Google Cloud products, see the
[Google Cloud sample browser](https://docs.cloud.google.com/docs/samples?product=computeengine).