Lister l'historique de préemption d'une instance Google Compute Engine

Cet exemple liste toutes les opérations de préemption qui se sont produites dans une zone donnée d'un projet. Vous pouvez éventuellement filtrer les résultats pour n'inclure que les opérations d'une instance spécifique.

Exemple de code

Go

Avant d'essayer cet exemple, suivez les instructions de configuration pour Go décrites dans le Guide de démarrage rapide de Compute Engine à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Go Compute Engine.

Pour vous authentifier auprès de Compute Engine, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

import (
	"context"
	"fmt"
	"io"
	"strings"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
	"google.golang.org/api/iterator"
	"google.golang.org/protobuf/proto"
)

// preemptionHisory gets a list of preemption operations from given zone in a project.
// Optionally limit the results to instance name.
func preemptionHisory(w io.Writer, projectID, zone, instanceName, customFilter string) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	// instanceName := "your_instance_name"
	// customFilter := "operationType=\"compute.instances.preempted\""

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

	filter := ""

	if customFilter != "" {
		filter = customFilter
	} else {
		filter = "operationType=\"compute.instances.preempted\""

		if instanceName != "" {
			filter += fmt.Sprintf(
				` AND targetLink="https://www.googleapis.com/compute/v1/projects/%s/zones/%s/instances/%s"`,
				projectID, zone, instanceName,
			)
		}
	}

	req := &computepb.ListZoneOperationsRequest{
		Project: projectID,
		Zone:    zone,
		Filter:  proto.String(filter),
	}

	it := operationsClient.List(ctx, req)
	for {
		operation, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}

		ss := strings.Split(operation.GetTargetLink(), "/")
		curInstName := ss[len(ss)-1]
		if curInstName == instanceName {
			// The filter used is not 100% accurate, it's `contains` not `equals`
			// So we need to check the name to make sure it's the one we want.
			fmt.Fprintf(w, "- %s %s\n", instanceName, operation.GetInsertTime())
		}
	}

	return nil
}

Java

Avant d'essayer cet exemple, suivez les instructions de configuration pour Java décrites dans le Guide de démarrage rapide de Compute Engine à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Java Compute Engine.

Pour vous authentifier auprès de Compute Engine, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

import com.google.cloud.compute.v1.ListZoneOperationsRequest;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.ZoneOperationsClient;
import com.google.cloud.compute.v1.ZoneOperationsClient.ListPagedResponse;
import java.io.IOException;
import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ListZoneOperations {

  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 look for.
    String projectId = "your-project-id-or-number";
    String zone = "zone-name";
    String instanceName = "instance-name";

    preemptionHistory(projectId, zone, instanceName);
  }


  // List all recent operations that happened in given zone in a project. Optionally filter those
  // operations by providing a filter. More about using the filter can be found here:
  // https://cloud.google.com/compute/docs/reference/rest/v1/zoneOperations/list
  public static ListPagedResponse listZoneOperations(String projectId, String zone, String filter)
      throws IOException {

    try (ZoneOperationsClient zoneOperationsClient = ZoneOperationsClient.create()) {
      ListZoneOperationsRequest request = ListZoneOperationsRequest.newBuilder()
          .setProject(projectId)
          .setZone(zone)
          .setFilter(filter)
          .build();

      return zoneOperationsClient.list(request);
    }
  }


  // Get a list of preemption operations from given zone in a project. Optionally limit
  // the results to instance name.
  private static void preemptionHistory(String projectId, String zone, String instanceName)
      throws IOException {

    String filter;
    String thisInstanceName;
    String targetLink;
    List<List<String>> history = new ArrayList<>();

    if (instanceName != null && instanceName.length() != 0) {
      filter = String.format(
          "operationType=\"compute.instances.preempted\" AND targetLink:instances/%s",
          instanceName);
    } else {
      filter = "operationType=\"compute.instances.preempted\"";
    }

    for (Operation operation : listZoneOperations(projectId, zone, filter).iterateAll()) {
      targetLink = operation.getTargetLink();
      thisInstanceName = targetLink.substring(targetLink.lastIndexOf("/") + 1);

      // The filter used above performs a 'contains' operation instead of 'equals'
      // So, the result (thisInstanceName) might not be tightly coupled with instanceName.
      // Hence, we need to check the name to make sure it's the one we want.
      if (thisInstanceName.equalsIgnoreCase(instanceName)) {
        Instant instant = Instant.from(
            DateTimeFormatter.ISO_INSTANT.parse(operation.getInsertTime()));
        history.add(new ArrayList<>(Arrays.asList(instanceName, instant.toString())));
      }
    }

    System.out.println("Retrieved preemption history: " + history);
  }
}

Node.js

Avant d'essayer cet exemple, suivez les instructions de configuration pour Node.js décrites dans le Guide de démarrage rapide de Compute Engine à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Node.js Compute Engine.

Pour vous authentifier auprès de Compute Engine, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

/**
 * 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 customFilter = 'operationType="compute.instances.preempted"';

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

async function preemptionHistory() {
  const zoneOperationsClient = new compute.ZoneOperationsClient();

  let filter;

  if (customFilter !== '') {
    filter = customFilter;
  } else {
    filter = 'operationType="compute.instances.preempted"';

    if (instanceName !== '') {
      filter += ` AND targetLink="https://www.googleapis.com/compute/v1/projects/${projectId}/zones/${zone}/instances/${instanceName}"`;
    }
  }

  const [operationsList] = await zoneOperationsClient.list({
    project: projectId,
    zone,
    filter,
  });

  for (const operation of operationsList) {
    const thisInstanceName = operation.targetLink.split('/').pop();
    if (thisInstanceName === instanceName) {
      // The filter used is not 100% accurate, it's `contains` not `equals`
      // So we need to check the name to make sure it's the one we want.
      console.log(`- ${instanceName} ${operation.insertTime}`);
    }
  }
}

preemptionHistory();

Python

Avant d'essayer cet exemple, suivez les instructions de configuration pour Python décrites dans le Guide de démarrage rapide de Compute Engine à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Python Compute Engine.

Pour vous authentifier auprès de Compute Engine, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

from __future__ import annotations

import datetime

from google.cloud import compute_v1
from google.cloud.compute_v1.services.zone_operations import pagers


def list_zone_operations(
    project_id: str, zone: str, filter: str = ""
) -> pagers.ListPager:
    """
    List all recent operations the happened in given zone in a project. Optionally filter those
    operations by providing a filter. More about using the filter can be found here:
    https://cloud.google.com/compute/docs/reference/rest/v1/zoneOperations/list
    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"
        filter: filter string to be used for this listing operation.
    Returns:
        List of preemption operations in given zone.
    """
    operation_client = compute_v1.ZoneOperationsClient()
    request = compute_v1.ListZoneOperationsRequest()
    request.project = project_id
    request.zone = zone
    request.filter = filter

    return operation_client.list(request)


def preemption_history(
    project_id: str, zone: str, instance_name: str = None
) -> list[tuple[str, datetime.datetime]]:
    """
    Get a list of preemption operations from given zone in a project. Optionally limit
    the results to instance name.
    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 look for.
    Returns:
        List of preemption operations in given zone.
    """
    if instance_name:
        filter = (
            f'operationType="compute.instances.preempted" '
            f"AND targetLink:instances/{instance_name}"
        )
    else:
        filter = 'operationType="compute.instances.preempted"'

    history = []

    for operation in list_zone_operations(project_id, zone, filter):
        this_instance_name = operation.target_link.rsplit("/", maxsplit=1)[1]
        if instance_name and this_instance_name == instance_name:
            # The filter used is not 100% accurate, it's `contains` not `equals`
            # So we need to check the name to make sure it's the one we want.
            moment = datetime.datetime.fromisoformat(operation.insert_time)
            history.append((instance_name, moment))

    return history

Étapes suivantes

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