Spostamento di un'istanza VM tra zone o regioni

Mantieni tutto organizzato con le raccolte Salva e classifica i contenuti in base alle tue preferenze.

Questo documento descrive come spostare un'istanza di macchina virtuale (VM) tra zone o aree geografiche.

Prima di iniziare

Requisiti

Questa sezione elenca i requisiti per lo spostamento di una VM tra zone e aree geografiche:

  • Quota del progetto. Il tuo progetto deve avere una quota sufficiente per:

    • Crea nuovi snapshot.
    • Promuovi qualsiasi indirizzo IP esterno temporaneo.

    • Crea nuove VM e nuovi dischi nell'area geografica di destinazione.

      Ad esempio, se hai tre dischi collegati alla VM che vuoi spostare, hai bisogno di una quota sufficiente per creare tre snapshot di dischi permanenti temporanei e tre nuovi dischi. Dopo aver creato i nuovi dischi, puoi eliminare gli snapshot temporanei.

    Consulta la pagina Quote per assicurarti di disporre di una quota sufficiente per le risorse precedenti. Per saperne di più, consulta Informazioni sulle quote.

  • Dischi permanenti. I dischi permanenti collegati alla VM che vuoi spostare non sono collegati ad altre VM.

  • SSD locali. Le unità SSD locali sono destinate all'archiviazione temporanea e i dati sulle unità SSD locali non vengono conservati tramite terminazioni VM manuali. Se devi conservare dati SSD locali, replicali utilizzando un'opzione di archiviazione durevole come i dischi permanenti.

  • GPU. Se la tua VM include GPU, verifica che le GPU che vuoi utilizzare siano disponibili nella zona di destinazione della VM. Per un elenco delle GPU e delle zone in cui sono disponibili, consulta la pagina relativa alle GPU su Compute Engine.

  • Subnet. Se vuoi spostare la VM tra regioni, ad esempio tra us-west1-a e asia-south1-b, e la tua VM appartiene a una subnet, devi selezionare una nuova subnet per la tua VM. Per istruzioni su come creare subnet, consulta la sezione Aggiungere subnet.

Limitazione

Se sposti una VM tra regioni diverse, non potrai conservare l'indirizzo IP interno o esterno della VM. Devi scegliere un nuovo indirizzo IP quando ricrei la VM.

Proprietà della risorsa

Per spostare la VM, devi arrestarla, spostarla nella zona o nell'area geografica di destinazione e riavviarla. Dopo aver spostato la VM, aggiorna eventuali riferimenti alla risorsa originale, ad esempio VM di destinazione o pool di destinazione che rimandano alla VM precedente.

Durante lo spostamento, alcune proprietà della VM e dei dischi generati dal server cambiano.

Proprietà che cambiano per le VM

La tabella seguente descrive le proprietà che cambiano per le VM:

Nome proprietà Modifiche
Indirizzo IP interno In genere viene assegnato un nuovo indirizzo IP interno, ma la VM potrebbe conservare l'indirizzo IP interno originale.
Indirizzo IP esterno Se la VM si sposta tra zone nella stessa area geografica, l'indirizzo IP esterno rimane invariato. In caso contrario, scegli un indirizzo IP esterno diverso per l'istanza VM.
Piattaforma CPU A seconda della piattaforma CPU disponibile nella zona di destinazione, la VM potrebbe avere una piattaforma CPU diversa dopo lo spostamento. Per un elenco completo delle piattaforme CPU in ogni zona, consulta Aree geografiche e zone disponibili.
Rete/subnet Se la VM appartiene a una subnet e stai spostando una VM in più aree geografiche, devi scegliere una nuova subnet per la VM. Le VM che si spostano tra zone nella stessa area geografica mantengono la stessa subnet.

Proprietà che cambiano per i dischi

La seguente tabella descrive le proprietà che cambiano per i dischi:

Nome proprietà Modifiche
Snapshot di origine Lo snapshot di origine del nuovo disco è impostato sullo snapshot temporaneo creato durante lo spostamento.
ID snapshot di origine L'ID snapshot di origine è impostato sull'ID dello snapshot temporaneo.
Immagine di origine Il campo dell'immagine di origine è vuoto.
ID immagine Il campo ID immagine è vuoto.
Timestamp ultimo scollegamento Il timestamp dell'ultimo scollegamento è vuoto.
Timestamp ultimo collegamento L'ultimo timestamp collegato cambia in timestamp quando il nuovo disco è stato collegato alla nuova istanza.

Proprietà che cambiano sia per le VM sia per i dischi

La tabella seguente descrive le proprietà che cambiano sia per le VM sia per i dischi:

Nome proprietà Modifiche
ID Viene generato un nuovo ID risorsa.
Timestamp creazione Viene generato un nuovo timestamp di creazione.
URL risorsa zona Tutti gli URL delle risorse di zona cambiano per riflettere la zona di destinazione. Il seguente elenco mostra gli URL delle risorse che cambiano:
  • URL del disco di origine di una VM
  • URL del tipo di macchina di una VM
  • URL collegati autonomamente
  • URL zona
  • URL tipo di disco
  • Tutti gli URL di VM elencate nell'elenco users[] di un disco

Spostamento di una VM tra zone o regioni

Per spostare una VM tra zone o aree geografiche:

  1. Crea un'immagine della macchina della tua VM di origine.
  2. Crea una VM dall'immagine della macchina in una zona o area geografica diversa.

I seguenti esempi mostrano come spostare una VM tra zone diverse.

gcloud

In questo esempio, sposti una VM denominata myinstance con due dischi permanenti denominati mybootdisk e mydatadisk, da europe-west1-c a us-west1-b.

  1. Identifica i dischi associati alla VM che vuoi spostare:

    gcloud compute instances describe myinstance --format="list(name,status,disks)"

    In questo esempio troverai i seguenti due dischi associati per la VM myinstance:

    • Un disco di avvio denominato mybootdisk
    • Un disco dati denominato mydatadisk

  2. Imposta lo stato di eliminazione automatica di mybootdisk e mydatadisk su false per assicurarti che i dischi non vengano eliminati automaticamente quando viene eliminata la VM.

    gcloud compute instances set-disk-auto-delete myinstance --zone europe-west1-c \
    --disk mybootdisk --no-auto-delete

    Se lo stato è stato aggiornato, gcloud compute restituisce la risposta Updated [...]. Se lo stato di eliminazione automatica era già impostato su false, gcloud compute restituisce:

    No change requested; skipping update for [myinstance].

  3. (Facoltativo) Salva i metadati della VM.

    Quando elimini la tua VM, vengono rimossi anche i metadati della VM. Puoi salvare queste informazioni in un file separato e poi applicare di nuovo i metadati della VM alla nuova VM.

    Descrivi i metadati della tua VM in questo modo:

    gcloud compute instances describe myinstance --zone europe-west1-c

    Salva il contenuto in un file separato.

  4. Crea backup dei dati utilizzando gli snapshot di dischi permanenti.

    Per precauzione, crea backup dei tuoi dati mentre i dischi permanenti sono ancora collegati alla VM tramite snapshot di dischi permanenti. Prima di acquisire uno snapshot, assicurati che sia coerente con lo stato del disco permanente rispettando le best practice relative agli snapshot.

    Dopo aver cancellato i buffer del disco, crea gli snapshot:

    gcloud compute disks snapshot mybootdisk mydatadisk \
    --snapshot-names backup-mybootsnapshot,backup-mydatasnapshot \
    --zone europe-west1-c

    Per verificare che lo snapshot sia stato creato, esegui gcloud compute snapshots list.

  5. (Facoltativo) Se stai spostando una VM tra zone all'interno della stessa regione e vuoi conservare il suo indirizzo IP interno o esterno temporaneo, promuovi l'indirizzo IP interno o esterno a un indirizzo IP statico, che puoi riutilizzare in un secondo momento.

  6. Elimina la VM.

    L'eliminazione della VM ne comporta la pulizia e lo scollegamento di qualsiasi disco permanente.

    gcloud compute instances delete myinstance --zone europe-west1-c

    gcloud ti chiede di confermare l'eliminazione:

    
The following VMs are deleted. Any attached disks configured to
be auto-deleted are deleted unless they are attached to any other
VMs or the `--keep-disks` flag is given and specifies them for keeping.
Deleting a disk is irreversible and any data on the disk is lost.
— [myinstance] in [europe-west1-c]

    Do you want to continue (Y/n)?

    Poiché hai disattivato lo stato di eliminazione automatica dei dischi in precedenza, inserisci Y per continuare e ignora l'avviso.

  7. Successivamente, crea un altro snapshot sia del disco di avvio sia del disco dati.

    gcloud compute disks snapshot mybootdisk mydatadisk \
    --snapshot-names mybootsnapshot,mydatasnapshot \
    --zone europe-west1-c 
    Created [.../mydatasnapshot].
Created [.../mybootsnapshot].

  8. (Facoltativo) Elimina i dischi permanenti.

    Se prevedi di riutilizzare i nomi dei dischi permanenti per i nuovi dischi, devi eliminare i dischi esistenti per rilasciarli. L'eliminazione dei dischi consente inoltre di risparmiare sui costi di archiviazione dei dischi permanenti.

    Se non prevedi di riutilizzare gli stessi nomi dei dischi, non è necessario eliminarli.

    gcloud compute disks delete mybootdisk mydatadisk --zone europe-west1-c

  9. Crea nuovi dischi permanenti in us-west1-b dagli snapshot che hai creato. Innanzitutto, crea il disco di avvio.

    gcloud compute disks create mybootdiskb --source-snapshot mybootsnapshot \
    --zone us-west1-b
    Created [.../mybootdiskb].
NAME        ZONE           SIZE_GB TYPE        STATUS
mybootdiskb us-west1-b     100     pd-standard READY

    quindi crea il disco dati.

    gcloud compute disks create mydatadiskb --source-snapshot mydatasnapshot \
    --zone us-west1-b
    Created [.../mydatadiskb].
NAME        ZONE           SIZE_GB TYPE        STATUS
mydatadiskb us-west1-b 4000    pd-standard READY

  10. Ricrea la VM in us-west1-b.

    • Se hai scelto di salvare i metadati della VM in un file, ad esempio myinstance.describe, puoi utilizzarla per impostare gli stessi metadati sulla VM.

    • Se la tua VM aveva un indirizzo IP esterno statico, puoi riassegnarlo alla nuova VM specificando l'opzione --address [ADDRESS]. Se stai spostando una VM tra regioni diverse, devi scegliere un indirizzo IP esterno diverso per la nuova istanza VM.

    • Se la tua VM aveva un indirizzo IP interno statico, puoi riassegnarlo alla nuova VM specificando l'opzione --private-network-ip ADDRESS. Se stai spostando una VM tra regioni diverse, devi scegliere un indirizzo IP interno diverso per la nuova istanza VM.

    • Se la tua VM includeva GPU, aggiungi GPU alla VM utilizzando l'opzione --accelerator.

    • Se la VM utilizza una subnet specifica, aggiungi il flag --subnet [SUBNET_NAME].

    Per un elenco completo dei flag aggiuntivi, vedi gcloud compute instances create.

    gcloud compute instances create myinstanceb --machine-type n1-standard-4 \
    --zone us-west1-b \
    --disk name=mybootdiskb,boot=yes,mode=rw \
    --disk name=mydatadiskb,mode=rw 
    Created [.../myinstanceb].
NAME        ZONE           MACHINE_TYPE  INTERNAL_IP    EXTERNAL_IP     STATUS
myinstanceb us-west1-b     n1-standard-4 10.240.173.229 146.148.112.106 RUNNING

  11. (Facoltativo) Elimina gli snapshot di disco permanente.

    Dopo aver confermato che le macchine virtuali sono state spostate, risparmia sui costi di archiviazione eliminando gli snapshot temporanei che hai creato.

    gcloud compute snapshots delete mybootsnapshot mydatasnapshot

    Se non ti servono più, elimina anche gli snapshot:

    gcloud compute snapshots delete backup-mybootsnapshot backup-mydatasnapshot

Go

  1. Ottieni i dettagli della VM e identifica i dischi collegati alla VM.

    compute/get_instance.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// getInstance prints a name of a VM instance in the given zone in the specified project.
func getInstance(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: %v", err)
	}
	defer instancesClient.Close()

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

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

	fmt.Fprintf(w, "Instance: %s\n", instance.GetName())

	return nil
}

  2. Imposta lo stato di eliminazione automatica del disco di avvio e del disco dati su false per assicurarti che i dischi non vengano eliminati automaticamente quando viene eliminata la VM.

    compute/disks/set_disk_autodelete.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// setDiskAutodelete sets the autodelete flag of a disk to given value as true.
func setDiskAutoDelete(
	w io.Writer,
	projectID, zone, instanceName, diskName string,
) error {
	// projectID := "your_project_id"
	// zone := "us-west3-b"
	// instanceName := "your_instance_name"
	// diskName := "your_disk_name"

	ctx := context.Background()
	instancesClient, err := compute.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)
	}

	diskExists := false

	for _, disk := range instance.GetDisks() {
		if disk.GetDeviceName() == diskName {
			diskExists = true
			break
		}
	}

	if !diskExists {
		return fmt.Errorf(
			"instance %s doesn't have a disk named %s attached",
			instanceName,
			diskName,
		)
	}

	req := &computepb.SetDiskAutoDeleteInstanceRequest{
		Project:    projectID,
		Zone:       zone,
		Instance:   instanceName,
		DeviceName: diskName,
		AutoDelete: true,
	}

	op, err := instancesClient.SetDiskAutoDelete(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to set disk autodelete field: %w", err)
	}

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

	fmt.Fprintf(w, "disk autoDelete field updated.\n")

	return nil
}

  3. Crea backup dei dati utilizzando gli snapshot di dischi permanenti.

    Per precauzione, crea backup dei tuoi dati mentre i dischi permanenti sono ancora collegati alla VM tramite snapshot di dischi permanenti. Prima di acquisire uno snapshot, assicurati che sia coerente con lo stato del disco permanente rispettando le best practice relative agli snapshot.

    Dopo aver cancellato i buffer del disco, crea gli snapshot:

    compute/snapshots/create_snapshot.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
	"google.golang.org/protobuf/proto"
)

// createSnapshot creates a snapshot of a disk.
func createSnapshot(
	w io.Writer,
	projectID, diskName, snapshotName, zone, region, location, diskProjectID string,
) error {
	// projectID := "your_project_id"
	// diskName := "your_disk_name"
	// snapshotName := "your_snapshot_name"
	// zone := "europe-central2-b"
	// region := "eupore-central2"
	// location = "eupore-central2"
	// diskProjectID = "YOUR_DISK_PROJECT_ID"

	ctx := context.Background()

	snapshotsClient, err := compute.NewSnapshotsRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewSnapshotsRESTClient: %v", err)
	}
	defer snapshotsClient.Close()

	if zone == "" && region == "" {
		return fmt.Errorf("you need to specify `zone` or `region` for this function to work")
	}

	if zone != "" && region != "" {
		return fmt.Errorf("you can't set both `zone` and `region` parameters")
	}

	if diskProjectID == "" {
		diskProjectID = projectID
	}

	disk := &computepb.Disk{}
	locations := []string{}
	if location != "" {
		locations = append(locations, location)
	}

	if zone != "" {
		disksClient, err := compute.NewDisksRESTClient(ctx)
		if err != nil {
			return fmt.Errorf("NewDisksRESTClient: %v", err)
		}
		defer disksClient.Close()

		getDiskReq := &computepb.GetDiskRequest{
			Project: projectID,
			Zone:    zone,
			Disk:    diskName,
		}

		disk, err = disksClient.Get(ctx, getDiskReq)
		if err != nil {
			return fmt.Errorf("unable to create disk: %v", err)
		}
	} else {
		regionDisksClient, err := compute.NewRegionDisksRESTClient(ctx)
		if err != nil {
			return fmt.Errorf("NewRegionDisksRESTClient: %v", err)
		}
		defer regionDisksClient.Close()

		getDiskReq := &computepb.GetRegionDiskRequest{
			Project: projectID,
			Region:  region,
			Disk:    diskName,
		}

		disk, err = regionDisksClient.Get(ctx, getDiskReq)
		if err != nil {
			return fmt.Errorf("unable to create disk: %v", err)
		}
	}

	req := &computepb.InsertSnapshotRequest{
		Project: projectID,
		SnapshotResource: &computepb.Snapshot{
			Name:             proto.String(snapshotName),
			SourceDisk:       proto.String(disk.GetSelfLink()),
			StorageLocations: locations,
		},
	}

	op, err := snapshotsClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create snapshot: %v", err)
	}

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

	fmt.Fprintf(w, "Snapshot created\n")

	return nil
}

  4. Elimina la VM dalla zona di origine.

    compute/delete_instance.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// deleteInstance sends a delete request to the Compute Engine API and waits for it to complete.
func deleteInstance(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: %v", err)
	}
	defer instancesClient.Close()

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

	op, err := instancesClient.Delete(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to delete instance: %v", err)
	}

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

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

	return nil
}

  5. Successivamente, crea un altro snapshot sia del disco di avvio sia dei dischi di dati.

    compute/snapshots/create_snapshot.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
	"google.golang.org/protobuf/proto"
)

// createSnapshot creates a snapshot of a disk.
func createSnapshot(
	w io.Writer,
	projectID, diskName, snapshotName, zone, region, location, diskProjectID string,
) error {
	// projectID := "your_project_id"
	// diskName := "your_disk_name"
	// snapshotName := "your_snapshot_name"
	// zone := "europe-central2-b"
	// region := "eupore-central2"
	// location = "eupore-central2"
	// diskProjectID = "YOUR_DISK_PROJECT_ID"

	ctx := context.Background()

	snapshotsClient, err := compute.NewSnapshotsRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewSnapshotsRESTClient: %v", err)
	}
	defer snapshotsClient.Close()

	if zone == "" && region == "" {
		return fmt.Errorf("you need to specify `zone` or `region` for this function to work")
	}

	if zone != "" && region != "" {
		return fmt.Errorf("you can't set both `zone` and `region` parameters")
	}

	if diskProjectID == "" {
		diskProjectID = projectID
	}

	disk := &computepb.Disk{}
	locations := []string{}
	if location != "" {
		locations = append(locations, location)
	}

	if zone != "" {
		disksClient, err := compute.NewDisksRESTClient(ctx)
		if err != nil {
			return fmt.Errorf("NewDisksRESTClient: %v", err)
		}
		defer disksClient.Close()

		getDiskReq := &computepb.GetDiskRequest{
			Project: projectID,
			Zone:    zone,
			Disk:    diskName,
		}

		disk, err = disksClient.Get(ctx, getDiskReq)
		if err != nil {
			return fmt.Errorf("unable to create disk: %v", err)
		}
	} else {
		regionDisksClient, err := compute.NewRegionDisksRESTClient(ctx)
		if err != nil {
			return fmt.Errorf("NewRegionDisksRESTClient: %v", err)
		}
		defer regionDisksClient.Close()

		getDiskReq := &computepb.GetRegionDiskRequest{
			Project: projectID,
			Region:  region,
			Disk:    diskName,
		}

		disk, err = regionDisksClient.Get(ctx, getDiskReq)
		if err != nil {
			return fmt.Errorf("unable to create disk: %v", err)
		}
	}

	req := &computepb.InsertSnapshotRequest{
		Project: projectID,
		SnapshotResource: &computepb.Snapshot{
			Name:             proto.String(snapshotName),
			SourceDisk:       proto.String(disk.GetSelfLink()),
			StorageLocations: locations,
		},
	}

	op, err := snapshotsClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create snapshot: %v", err)
	}

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

	fmt.Fprintf(w, "Snapshot created\n")

	return nil
}

  6. (Facoltativo) Elimina i dischi permanenti.

    Se prevedi di riutilizzare i nomi dei dischi permanenti per i nuovi dischi, devi eliminare i dischi esistenti per rilasciarli. L'eliminazione dei dischi consente inoltre di risparmiare sui costi di archiviazione dei dischi permanenti.

    Se non prevedi di riutilizzare gli stessi nomi dei dischi, non è necessario eliminarli.

    compute/disks/delete_disk.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// deleteDisk deletes a disk from a project.
func deleteDisk(w io.Writer, projectID, zone, diskName string) error {
	// projectID := "your_project_id"
	// zone := "us-west3-b"
	// diskName := "your_disk_name"

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

	req := &computepb.DeleteDiskRequest{
		Project: projectID,
		Zone:    zone,
		Disk:    diskName,
	}

	op, err := disksClient.Delete(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to delete disk: %w", err)
	}

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

	fmt.Fprintf(w, "Disk deleted\n")

	return nil
}

  7. Crea nuovi dischi permanenti nella zona di destinazione dagli snapshot che hai creato. Prima crea il disco di avvio, poi i dischi dati.

    compute/disks/create_disk_from_snapshot.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
	"google.golang.org/protobuf/proto"
)

// createDiskFromSnapshot creates a new disk in a project in given zone.
func createDiskFromSnapshot(
	w io.Writer,
	projectID, zone, diskName, diskType, snapshotLink string,
	diskSizeGb int64,
) error {
	// projectID := "your_project_id"
	// zone := "us-west3-b" // should match diskType below
	// diskName := "your_disk_name"
	// diskType := "zones/us-west3-b/diskTypes/pd-ssd"
	// snapshotLink := "projects/your_project_id/global/snapshots/snapshot_name"
	// diskSizeGb := 120

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

	req := &computepb.InsertDiskRequest{
		Project: projectID,
		Zone:    zone,
		DiskResource: &computepb.Disk{
			Name:           proto.String(diskName),
			Zone:           proto.String(zone),
			Type:           proto.String(diskType),
			SourceSnapshot: proto.String(snapshotLink),
			SizeGb:         proto.Int64(diskSizeGb),
		},
	}

	op, err := disksClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create disk: %w", err)
	}

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

	fmt.Fprintf(w, "Disk created\n")

	return nil
}

  8. Ricrea la VM con i nuovi dischi nella zona di destinazione.

    compute/instances/create-start-instance/create_instance_with_existing_disks.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
	"google.golang.org/protobuf/proto"
)

// createWithExistingDisks create a new VM instance using selected disks.
// The first disk in diskNames will be used as boot disk.
func createWithExistingDisks(
	w io.Writer,
	projectID, zone, instanceName string,
	diskNames []string,
) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	// instanceName := "your_instance_name"
	// diskNames := []string{"boot_disk", "disk1", "disk2"}

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

	disksClient, err := compute.NewDisksRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewDisksRESTClient: %v", err)
	}
	defer disksClient.Close()

	disks := [](*computepb.Disk){}

	for _, diskName := range diskNames {
		reqDisk := &computepb.GetDiskRequest{
			Project: projectID,
			Zone:    zone,
			Disk:    diskName,
		}

		disk, err := disksClient.Get(ctx, reqDisk)
		if err != nil {
			return fmt.Errorf("unable to get disk: %v", err)
		}

		disks = append(disks, disk)
	}

	attachedDisks := [](*computepb.AttachedDisk){}

	for _, disk := range disks {
		attachedDisk := &computepb.AttachedDisk{
			Source: proto.String(disk.GetSelfLink()),
		}
		attachedDisks = append(attachedDisks, attachedDisk)
	}

	attachedDisks[0].Boot = proto.Bool(true)

	instanceResource := &computepb.Instance{
		Name:        proto.String(instanceName),
		Disks:       attachedDisks,
		MachineType: proto.String(fmt.Sprintf("zones/%s/machineTypes/n1-standard-1", zone)),
		NetworkInterfaces: []*computepb.NetworkInterface{
			{
				Name: proto.String("global/networks/default"),
			},
		},
	}

	req := &computepb.InsertInstanceRequest{
		Project:          projectID,
		Zone:             zone,
		InstanceResource: instanceResource,
	}

	op, err := instancesClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create instance: %v", err)
	}

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

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

	return nil
}

  9. (Facoltativo) Elimina gli snapshot temporanei del disco. Dopo aver confermato che le macchine virtuali sono state spostate, risparmia sui costi di archiviazione eliminando gli snapshot temporanei che hai creato.

    compute/snapshots/delete_snapshot.go 
    import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// deleteSnapshot deletes a snapshot of a disk.
func deleteSnapshot(w io.Writer, projectID, snapshotName string) error {
	// projectID := "your_project_id"
	// snapshotName := "your_snapshot_name"

	ctx := context.Background()
	snapshotsClient, err := compute.NewSnapshotsRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewSnapshotsRESTClient: %v", err)
	}
	defer snapshotsClient.Close()

	req := &computepb.DeleteSnapshotRequest{
		Project:  projectID,
		Snapshot: snapshotName,
	}

	op, err := snapshotsClient.Delete(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to delete snapshot: %v", err)
	}

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

	fmt.Fprintf(w, "Snapshot deleted\n")

	return nil
}

Java

  1. Ottieni i dettagli della VM e identifica i dischi collegati alla VM.

    compute/cloud-client/src/main/java/compute/GetInstance.java 
    
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import java.io.IOException;

public class GetInstance {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the zone you want to use. For example: 'us-west3-b'.
    String zone = "europe-central2-b";

    // Name of the VM instance you want to query.
    String instanceName = "YOUR_INSTANCE_NAME";

    getInstance(projectId, zone, instanceName);
  }

  // Prints information about a VM instance in the given zone in the specified project.
  public static void getInstance(String projectId, String zone, String instanceName)
      throws IOException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `instancesClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (InstancesClient instancesClient = InstancesClient.create()) {

      Instance instance = instancesClient.get(projectId, zone, instanceName);

      System.out.printf("Retrieved the instance %s", instance.toString());
    }
  }
}

  2. Imposta lo stato di eliminazione automatica del disco di avvio e del disco dati su false per assicurarti che i dischi non vengano eliminati automaticamente quando viene eliminata la VM.

    compute/cloud-client/src/main/java/compute/disks/SetDiskAutodelete.java 
    
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.SetDiskAutoDeleteInstanceRequest;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class SetDiskAutodelete {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // The zone of the disk that you want to modify.
    String zone = "europe-central2-b";

    // Name of the instance the disk is attached to.
    String instanceName = "YOUR_INSTANCE_NAME";

    // The name of the disk for which you want to modify the autodelete flag.
    String diskName = "YOUR_DISK_NAME";

    // The new value of the autodelete flag.
    boolean autoDelete = true;

    setDiskAutodelete(projectId, zone, instanceName, diskName, autoDelete);
  }

  // Sets the autodelete flag of a disk to given value.
  public static void setDiskAutodelete(String projectId, String zone, String instanceName,
      String diskName, boolean autoDelete)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `instancesClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (InstancesClient instancesClient = InstancesClient.create()) {

      // Retrieve the instance given by the instanceName.
      Instance instance = instancesClient.get(projectId, zone, instanceName);

      // Check if the instance contains a disk that matches the given diskName.
      boolean diskNameMatch = instance.getDisksList()
          .stream()
          .anyMatch(disk -> disk.getDeviceName().equals(diskName));

      if (!diskNameMatch) {
        throw new Error(
            String.format("Instance %s doesn't have a disk named %s attached", instanceName,
                diskName));
      }

      // Create the request object.
      SetDiskAutoDeleteInstanceRequest request = SetDiskAutoDeleteInstanceRequest.newBuilder()
          .setProject(projectId)
          .setZone(zone)
          .setInstance(instanceName)
          .setDeviceName(diskName)
          // Update the autodelete property.
          .setAutoDelete(autoDelete)
          .build();

      // Wait for the update instance operation to complete.
      Operation response = instancesClient.setDiskAutoDeleteAsync(request)
          .get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        System.out.println("Failed to update Disk autodelete field!" + response);
        return;
      }
      System.out.println(
          "Disk autodelete field updated. Operation Status: " + response.getStatus());
    }
  }
}

  3. Crea backup dei dati utilizzando gli snapshot di dischi permanenti.

    Per precauzione, crea backup dei tuoi dati mentre i dischi permanenti sono ancora collegati alla VM tramite snapshot di dischi permanenti. Prima di acquisire uno snapshot, assicurati che sia coerente con lo stato del disco permanente rispettando le best practice relative agli snapshot.

    Dopo aver cancellato i buffer del disco, crea gli snapshot:

    compute/cloud-client/src/main/java/compute/disks/CreateSnapshot.java 
    
import com.google.cloud.compute.v1.Disk;
import com.google.cloud.compute.v1.DisksClient;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.RegionDisksClient;
import com.google.cloud.compute.v1.Snapshot;
import com.google.cloud.compute.v1.SnapshotsClient;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateSnapshot {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // You need to pass `zone` or `region` parameter relevant to the disk you want to
    // snapshot, but not both. Pass `zone` parameter for zonal disks and `region` for
    // regional disks.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the disk you want to create.
    String diskName = "YOUR_DISK_NAME";

    // Name of the snapshot that you want to create.
    String snapshotName = "YOUR_SNAPSHOT_NAME";

    // The zone of the source disk from which you create the snapshot (for zonal disks).
    String zone = "europe-central2-b";

    // The region of the source disk from which you create the snapshot (for regional disks).
    String region = "your-disk-region";

    // The Cloud Storage multi-region or the Cloud Storage region where you
    // want to store your snapshot.
    // You can specify only one storage location. Available locations:
    // https://cloud.google.com/storage/docs/locations#available-locations
    String location = "europe-central2";

    // Project ID or project number of the Cloud project that
    // hosts the disk you want to snapshot. If not provided, the value will be defaulted
    // to 'projectId' value.
    String diskProjectId = "YOUR_DISK_PROJECT_ID";

    createSnapshot(projectId, diskName, snapshotName, zone, region, location, diskProjectId);
  }

  // Creates a snapshot of a disk.
  public static void createSnapshot(String projectId, String diskName, String snapshotName,
      String zone, String region, String location, String diskProjectId)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `snapshotsClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (SnapshotsClient snapshotsClient = SnapshotsClient.create()) {

      if (zone.isEmpty() && region.isEmpty()) {
        throw new Error("You need to specify 'zone' or 'region' for this function to work");
      }

      if (!zone.isEmpty() && !region.isEmpty()) {
        throw new Error("You can't set both 'zone' and 'region' parameters");
      }

      // If Disk's project id is not specified, then the projectId parameter will be used.
      if (diskProjectId.isEmpty()) {
        diskProjectId = projectId;
      }

      // If zone is not empty, use the DisksClient to create a disk.
      // Else, use the RegionDisksClient.
      Disk disk;
      if (!zone.isEmpty()) {
        DisksClient disksClient = DisksClient.create();
        disk = disksClient.get(projectId, zone, diskName);
      } else {
        RegionDisksClient regionDisksClient = RegionDisksClient.create();
        disk = regionDisksClient.get(diskProjectId, region, diskName);
      }

      // Set the snapshot properties.
      Snapshot snapshotResource;
      if (!location.isEmpty()) {
        snapshotResource = Snapshot.newBuilder()
            .setName(snapshotName)
            .setSourceDisk(disk.getSelfLink())
            .addStorageLocations(location)
            .build();
      } else {
        snapshotResource = Snapshot.newBuilder()
            .setName(snapshotName)
            .setSourceDisk(disk.getSelfLink())
            .build();
      }

      // Wait for the operation to complete.
      Operation operation = snapshotsClient.insertAsync(projectId, snapshotResource)
          .get(3, TimeUnit.MINUTES);

      if (operation.hasError()) {
        System.out.println("Snapshot creation failed!" + operation);
        return;
      }

      // Retrieve the created snapshot.
      Snapshot snapshot = snapshotsClient.get(projectId, snapshotName);
      System.out.printf("Snapshot created: %s", snapshot.getName());

    }
  }
}

  4. Elimina la VM dalla zona di origine.

    compute/cloud-client/src/main/java/compute/DeleteInstance.java 
    
import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.compute.v1.DeleteInstanceRequest;
import com.google.cloud.compute.v1.InstancesClient;
import com.google.cloud.compute.v1.Operation;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class DeleteInstance {

  public static void main(String[] args)
      throws IOException, InterruptedException, ExecutionException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    String project = "your-project-id";
    String zone = "zone-name";
    String instanceName = "instance-name";
    deleteInstance(project, zone, instanceName);
  }

  // Delete the instance specified by `instanceName`
  // if it's present in the given project and zone.
  public static void deleteInstance(String project, String zone, String instanceName)
      throws IOException, InterruptedException, ExecutionException, TimeoutException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `instancesClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (InstancesClient instancesClient = InstancesClient.create()) {

      System.out.printf("Deleting instance: %s ", instanceName);

      // Describe which instance is to be deleted.
      DeleteInstanceRequest deleteInstanceRequest = DeleteInstanceRequest.newBuilder()
          .setProject(project)
          .setZone(zone)
          .setInstance(instanceName).build();

      OperationFuture<Operation, Operation> operation = instancesClient.deleteAsync(
          deleteInstanceRequest);
      // Wait for the operation to complete.
      Operation response = operation.get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        System.out.println("Instance deletion failed ! ! " + response);
        return;
      }
      System.out.println("Operation Status: " + response.getStatus());
    }
  }
}

  5. Successivamente, crea un altro snapshot sia del disco di avvio sia dei dischi di dati.

    compute/cloud-client/src/main/java/compute/disks/CreateSnapshot.java 
    
import com.google.cloud.compute.v1.Disk;
import com.google.cloud.compute.v1.DisksClient;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.RegionDisksClient;
import com.google.cloud.compute.v1.Snapshot;
import com.google.cloud.compute.v1.SnapshotsClient;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateSnapshot {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // You need to pass `zone` or `region` parameter relevant to the disk you want to
    // snapshot, but not both. Pass `zone` parameter for zonal disks and `region` for
    // regional disks.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the disk you want to create.
    String diskName = "YOUR_DISK_NAME";

    // Name of the snapshot that you want to create.
    String snapshotName = "YOUR_SNAPSHOT_NAME";

    // The zone of the source disk from which you create the snapshot (for zonal disks).
    String zone = "europe-central2-b";

    // The region of the source disk from which you create the snapshot (for regional disks).
    String region = "your-disk-region";

    // The Cloud Storage multi-region or the Cloud Storage region where you
    // want to store your snapshot.
    // You can specify only one storage location. Available locations:
    // https://cloud.google.com/storage/docs/locations#available-locations
    String location = "europe-central2";

    // Project ID or project number of the Cloud project that
    // hosts the disk you want to snapshot. If not provided, the value will be defaulted
    // to 'projectId' value.
    String diskProjectId = "YOUR_DISK_PROJECT_ID";

    createSnapshot(projectId, diskName, snapshotName, zone, region, location, diskProjectId);
  }

  // Creates a snapshot of a disk.
  public static void createSnapshot(String projectId, String diskName, String snapshotName,
      String zone, String region, String location, String diskProjectId)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `snapshotsClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (SnapshotsClient snapshotsClient = SnapshotsClient.create()) {

      if (zone.isEmpty() && region.isEmpty()) {
        throw new Error("You need to specify 'zone' or 'region' for this function to work");
      }

      if (!zone.isEmpty() && !region.isEmpty()) {
        throw new Error("You can't set both 'zone' and 'region' parameters");
      }

      // If Disk's project id is not specified, then the projectId parameter will be used.
      if (diskProjectId.isEmpty()) {
        diskProjectId = projectId;
      }

      // If zone is not empty, use the DisksClient to create a disk.
      // Else, use the RegionDisksClient.
      Disk disk;
      if (!zone.isEmpty()) {
        DisksClient disksClient = DisksClient.create();
        disk = disksClient.get(projectId, zone, diskName);
      } else {
        RegionDisksClient regionDisksClient = RegionDisksClient.create();
        disk = regionDisksClient.get(diskProjectId, region, diskName);
      }

      // Set the snapshot properties.
      Snapshot snapshotResource;
      if (!location.isEmpty()) {
        snapshotResource = Snapshot.newBuilder()
            .setName(snapshotName)
            .setSourceDisk(disk.getSelfLink())
            .addStorageLocations(location)
            .build();
      } else {
        snapshotResource = Snapshot.newBuilder()
            .setName(snapshotName)
            .setSourceDisk(disk.getSelfLink())
            .build();
      }

      // Wait for the operation to complete.
      Operation operation = snapshotsClient.insertAsync(projectId, snapshotResource)
          .get(3, TimeUnit.MINUTES);

      if (operation.hasError()) {
        System.out.println("Snapshot creation failed!" + operation);
        return;
      }

      // Retrieve the created snapshot.
      Snapshot snapshot = snapshotsClient.get(projectId, snapshotName);
      System.out.printf("Snapshot created: %s", snapshot.getName());

    }
  }
}

  6. (Facoltativo) Elimina i dischi permanenti.

    Se prevedi di riutilizzare i nomi dei dischi permanenti per i nuovi dischi, devi eliminare i dischi esistenti per rilasciarli. L'eliminazione dei dischi consente inoltre di risparmiare sui costi di archiviazione dei dischi permanenti.

    Se non prevedi di riutilizzare gli stessi nomi dei dischi, non è necessario eliminarli.

    compute/cloud-client/src/main/java/compute/disks/DeleteDisk.java 
    
import com.google.cloud.compute.v1.DeleteDiskRequest;
import com.google.cloud.compute.v1.DisksClient;
import com.google.cloud.compute.v1.Operation;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class DeleteDisk {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // The zone from where you want to delete the disk.
    String zone = "europe-central2-b";

    // Name of the disk you want to delete.
    String diskName = "YOUR_DISK_NAME";

    deleteDisk(projectId, zone, diskName);
  }

  // Deletes a disk from a project.
  public static void deleteDisk(String projectId, String zone, String diskName)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `disksClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (DisksClient disksClient = DisksClient.create()) {

      // Create the request object.
      DeleteDiskRequest deleteDiskRequest = DeleteDiskRequest.newBuilder()
          .setProject(projectId)
          .setZone(zone)
          .setDisk(diskName)
          .build();

      // Wait for the delete disk operation to complete.
      Operation response = disksClient.deleteAsync(deleteDiskRequest)
          .get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        System.out.println("Disk deletion failed!" + response);
        return;
      }
      System.out.println("Operation Status: " + response.getStatus());
    }
  }
}

  7. Crea nuovi dischi permanenti nella zona di destinazione dagli snapshot che hai creato. Prima crea il disco di avvio, poi i dischi dati.

    compute/cloud-client/src/main/java/compute/disks/CreateDiskFromSnapshot.java 
    
import com.google.cloud.compute.v1.Disk;
import com.google.cloud.compute.v1.DisksClient;
import com.google.cloud.compute.v1.InsertDiskRequest;
import com.google.cloud.compute.v1.Operation;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateDiskFromSnapshot {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the zone in which you want to create the disk.
    String zone = "europe-central2-b";

    // Name of the disk you want to create.
    String diskName = "YOUR_DISK_NAME";

    // The type of disk you want to create. This value uses the following format:
    // "zones/{zone}/diskTypes/(pd-standard|pd-ssd|pd-balanced|pd-extreme)".
    // For example: "zones/us-west3-b/diskTypes/pd-ssd"
    String diskType = String.format("zones/%s/diskTypes/pd-ssd", zone);

    // Size of the new disk in gigabytes.
    long diskSizeGb = 10;

    // The full path and name of the snapshot that you want to use as the source for the new disk.
    // This value uses the following format:
    // "projects/{projectName}/global/snapshots/{snapshotName}"
    String snapshotLink = String.format("projects/%s/global/snapshots/%s", projectId,
        "SNAPSHOT_NAME");

    createDiskFromSnapshot(projectId, zone, diskName, diskType, diskSizeGb, snapshotLink);
  }

  // Creates a new disk in a project in given zone, using a snapshot.
  public static void createDiskFromSnapshot(String projectId, String zone, String diskName,
      String diskType, long diskSizeGb, String snapshotLink)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `disksClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (DisksClient disksClient = DisksClient.create()) {

      // Set the disk properties and the source snapshot.
      Disk disk = Disk.newBuilder()
          .setName(diskName)
          .setZone(zone)
          .setSizeGb(diskSizeGb)
          .setType(diskType)
          .setSourceSnapshot(snapshotLink)
          .build();

      // Create the insert disk request.
      InsertDiskRequest insertDiskRequest = InsertDiskRequest.newBuilder()
          .setProject(projectId)
          .setZone(zone)
          .setDiskResource(disk)
          .build();

      // Wait for the create disk operation to complete.
      Operation response = disksClient.insertAsync(insertDiskRequest)
          .get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        System.out.println("Disk creation failed!" + response);
        return;
      }
      System.out.println("Disk created. Operation Status: " + response.getStatus());
    }
  }
}

  8. Ricrea la VM con i nuovi dischi nella zona di destinazione.

    compute/cloud-client/src/main/java/compute/CreateInstanceWithExistingDisks.java 
    
import com.google.cloud.compute.v1.AttachedDisk;
import com.google.cloud.compute.v1.Disk;
import com.google.cloud.compute.v1.DisksClient;
import com.google.cloud.compute.v1.InsertInstanceRequest;
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import com.google.cloud.compute.v1.NetworkInterface;
import com.google.cloud.compute.v1.Operation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateInstanceWithExistingDisks {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the zone to create the instance in. For example: "us-west3-b"
    String zone = "europe-central2-b";

    // Name of the new virtual machine (VM) instance.
    String instanceName = "YOUR_INSTANCE_NAME";

    // Array of disk names to be attached to the new virtual machine.
    // First disk in this list will be used as the boot disk.
    List<String> diskNames = List.of("your-boot-disk", "another-disk1", "another-disk2");

    createInstanceWithExistingDisks(projectId, zone, instanceName, diskNames);
  }

  // Create a new VM instance using the selected disks.
  // The first disk in diskNames will be used as the boot disk.
  public static void createInstanceWithExistingDisks(String projectId, String zone,
      String instanceName, List<String> diskNames)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `instancesClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (InstancesClient instancesClient = InstancesClient.create();
        DisksClient disksClient = DisksClient.create()) {

      if (diskNames.size() == 0) {
        throw new Error("At least one disk should be provided");
      }

      // Create the list of attached disks to be used in instance creation.
      List<AttachedDisk> attachedDisks = new ArrayList<>();
      for (int i = 0; i < diskNames.size(); i++) {
        String diskName = diskNames.get(i);
        Disk disk = disksClient.get(projectId, zone, diskName);
        AttachedDisk attDisk = null;

        if (i == 0) {
          // Make the first disk in the list as the boot disk.
          attDisk = AttachedDisk.newBuilder()
              .setSource(disk.getSelfLink())
              .setBoot(true)
              .build();
        } else {
          attDisk = AttachedDisk.newBuilder()
              .setSource(disk.getSelfLink())
              .build();
        }
        attachedDisks.add(attDisk);
      }

      // Create the instance.
      Instance instance = Instance.newBuilder()
          .setName(instanceName)
          // Add the attached disks to the instance.
          .addAllDisks(attachedDisks)
          .setMachineType(String.format("zones/%s/machineTypes/n1-standard-1", zone))
          .addNetworkInterfaces(
              NetworkInterface.newBuilder().setName("global/networks/default").build())
          .build();

      // Create the insert instance request.
      InsertInstanceRequest insertInstanceRequest = InsertInstanceRequest.newBuilder()
          .setProject(projectId)
          .setZone(zone)
          .setInstanceResource(instance)
          .build();

      // Wait for the create operation to complete.
      Operation response = instancesClient.insertAsync(insertInstanceRequest)
          .get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        System.out.println("Instance creation failed!" + response);
        return;
      }
      System.out.println("Operation Status: " + response.getStatus());

    }
  }
}

  9. (Facoltativo) Elimina gli snapshot temporanei del disco. Dopo aver confermato che le macchine virtuali sono state spostate, risparmia sui costi di archiviazione eliminando gli snapshot temporanei che hai creato.

    compute/cloud-client/src/main/java/compute/disks/DeleteSnapshot.java 
    
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.SnapshotsClient;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class DeleteSnapshot {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.

    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";

    // Name of the snapshot to be deleted.
    String snapshotName = "YOUR_SNAPSHOT_NAME";

    deleteSnapshot(projectId, snapshotName);
  }

  // Delete a snapshot of a disk.
  public static void deleteSnapshot(String projectId, String snapshotName)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {

    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `snapshotsClient.close()` method on the client to safely
    // clean up any remaining background resources.
    try (SnapshotsClient snapshotsClient = SnapshotsClient.create()) {

      Operation operation = snapshotsClient.deleteAsync(projectId, snapshotName)
          .get(3, TimeUnit.MINUTES);

      if (operation.hasError()) {
        System.out.println("Snapshot deletion failed!" + operation);
        return;
      }

      System.out.println("Snapshot deleted!");
    }
  }
}

Node.js

  1. Ottieni i dettagli della VM e identifica i dischi collegati alla VM.

    compute/getInstance.js 
    /**
 * 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 getInstance() {
  const instancesClient = new compute.InstancesClient();

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

  console.log(
    `Instance ${instanceName} data:\n${JSON.stringify(instance, null, 4)}`
  );
}
getInstance();

  2. Imposta lo stato di eliminazione automatica del disco di avvio e del disco dati su false per assicurarti che i dischi non vengano eliminati automaticamente quando viene eliminata la VM.

    compute/disks/setDiskAutodelete.js 
    /**
 * 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 diskName = 'YOUR_DISK_NAME';
// const autoDelete = true;

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

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

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

  if (!instance.disks.some(disk => disk.deviceName === diskName)) {
    throw new Error(
      `Instance ${instanceName} doesn't have a disk named ${diskName} attached.`
    );
  }

  const [response] = await instancesClient.setDiskAutoDelete({
    project: projectId,
    zone,
    instance: instanceName,
    deviceName: diskName,
    autoDelete,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.ZoneOperationsClient();

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

  console.log('Disk autoDelete field updated.');
}

setDiskAutodelete();

  3. Crea backup dei dati utilizzando gli snapshot di dischi permanenti.

    Per precauzione, crea backup dei tuoi dati mentre i dischi permanenti sono ancora collegati alla VM tramite snapshot di dischi permanenti. Prima di acquisire uno snapshot, assicurati che sia coerente con lo stato del disco permanente rispettando le best practice relative agli snapshot.

    Dopo aver cancellato i buffer del disco, crea gli snapshot:

    compute/snapshots/createSnapshot.js 
    /**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const diskName = 'YOUR_DISK_NAME';
// const snapshotName = 'YOUR_SNAPSHOT_NAME';
// const zone = 'europe-central2-b';
// const region = '';
// const location = 'europe-central2';
// let diskProjectId = 'YOUR_DISK_PROJECT_ID';

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

async function createSnapshot() {
  const snapshotsClient = new compute.SnapshotsClient();

  let disk;

  if (!zone && !region) {
    throw new Error(
      'You need to specify `zone` or `region` for this function to work.'
    );
  }

  if (zone && region) {
    throw new Error("You can't set both `zone` and `region` parameters");
  }

  if (!diskProjectId) {
    diskProjectId = projectId;
  }

  if (zone) {
    const disksClient = new compute.DisksClient();
    [disk] = await disksClient.get({
      project: diskProjectId,
      zone,
      disk: diskName,
    });
  } else {
    const regionDisksClient = new compute.RegionDisksClient();
    [disk] = await regionDisksClient.get({
      project: diskProjectId,
      region,
      disk: diskName,
    });
  }

  const snapshotResource = {
    name: snapshotName,
    sourceDisk: disk.selfLink,
  };

  if (location) {
    snapshotResource.storageLocations = [location];
  }

  const [response] = await snapshotsClient.insert({
    project: projectId,
    snapshotResource,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.GlobalOperationsClient();

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

  console.log('Snapshot created.');
}

createSnapshot();

  4. Elimina la VM dalla zona di origine.

    compute/deleteInstance.js 
    /**
 * TODO(developer): Uncomment 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');

// Delete the instance specified by `instanceName` if it's present in the given project and zone.
async function deleteInstance() {
  const instancesClient = new compute.InstancesClient();

  console.log(`Deleting ${instanceName} from ${zone}...`);

  const [response] = await instancesClient.delete({
    project: projectId,
    zone,
    instance: instanceName,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.ZoneOperationsClient();

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

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

deleteInstance();

  5. Successivamente, crea un altro snapshot sia del disco di avvio sia dei dischi di dati.

    compute/snapshots/createSnapshot.js 
    /**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const diskName = 'YOUR_DISK_NAME';
// const snapshotName = 'YOUR_SNAPSHOT_NAME';
// const zone = 'europe-central2-b';
// const region = '';
// const location = 'europe-central2';
// let diskProjectId = 'YOUR_DISK_PROJECT_ID';

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

async function createSnapshot() {
  const snapshotsClient = new compute.SnapshotsClient();

  let disk;

  if (!zone && !region) {
    throw new Error(
      'You need to specify `zone` or `region` for this function to work.'
    );
  }

  if (zone && region) {
    throw new Error("You can't set both `zone` and `region` parameters");
  }

  if (!diskProjectId) {
    diskProjectId = projectId;
  }

  if (zone) {
    const disksClient = new compute.DisksClient();
    [disk] = await disksClient.get({
      project: diskProjectId,
      zone,
      disk: diskName,
    });
  } else {
    const regionDisksClient = new compute.RegionDisksClient();
    [disk] = await regionDisksClient.get({
      project: diskProjectId,
      region,
      disk: diskName,
    });
  }

  const snapshotResource = {
    name: snapshotName,
    sourceDisk: disk.selfLink,
  };

  if (location) {
    snapshotResource.storageLocations = [location];
  }

  const [response] = await snapshotsClient.insert({
    project: projectId,
    snapshotResource,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.GlobalOperationsClient();

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

  console.log('Snapshot created.');
}

createSnapshot();

  6. (Facoltativo) Elimina i dischi permanenti.

    Se prevedi di riutilizzare i nomi dei dischi permanenti per i nuovi dischi, devi eliminare i dischi esistenti per rilasciarli. L'eliminazione dei dischi consente inoltre di risparmiare sui costi di archiviazione dei dischi permanenti.

    Se non prevedi di riutilizzare gli stessi nomi dei dischi, non è necessario eliminarli.

    compute/disks/deleteDisk.js 
    /**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const zone = 'europe-central2-b';
// const diskName = 'YOUR_DISK_NAME';

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

async function deleteDisk() {
  const disksClient = new compute.DisksClient();

  const [response] = await disksClient.delete({
    project: projectId,
    zone,
    disk: diskName,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.ZoneOperationsClient();

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

  console.log('Disk deleted.');
}

deleteDisk();

  7. Crea nuovi dischi permanenti nella zona di destinazione dagli snapshot che hai creato. Prima crea il disco di avvio, poi i dischi dati.

    compute/disks/createDiskFromSnapshot.js 
    /**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const zone = 'europe-central2-b';
// const diskName = 'YOUR_DISK_NAME';
// const diskType = 'zones/us-west3-b/diskTypes/pd-ssd';
// const diskSizeGb = 10;
// const snapshotLink = 'projects/project_name/global/snapshots/snapshot_name';

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

async function createDiskFromSnapshot() {
  const disksClient = new compute.DisksClient();

  const [response] = await disksClient.insert({
    project: projectId,
    zone,
    diskResource: {
      sizeGb: diskSizeGb,
      name: diskName,
      zone,
      type: diskType,
      sourceSnapshot: snapshotLink,
    },
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.ZoneOperationsClient();

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

  console.log('Disk created.');
}

createDiskFromSnapshot();

  8. Ricrea la VM con i nuovi dischi nella zona di destinazione.

    compute/instances/create-start-instance/createInstanceWithExistingDisks.js 
    /**
 * 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 diskNames = ['boot_disk', 'disk1', 'disk2'];

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

async function createWithExistingDisks() {
  const instancesClient = new compute.InstancesClient();
  const disksClient = new compute.DisksClient();

  if (diskNames.length < 1) {
    throw new Error('At least one disk should be provided');
  }

  const disks = [];
  for (const diskName of diskNames) {
    const [disk] = await disksClient.get({
      project: projectId,
      zone,
      disk: diskName,
    });
    disks.push(disk);
  }

  const attachedDisks = [];

  for (const disk of disks) {
    attachedDisks.push({
      source: disk.selfLink,
    });
  }

  attachedDisks[0].boot = true;

  const [response] = await instancesClient.insert({
    project: projectId,
    zone,
    instanceResource: {
      name: instanceName,
      disks: attachedDisks,
      machineType: `zones/${zone}/machineTypes/n1-standard-1`,
      networkInterfaces: [
        {
          name: 'global/networks/default',
        },
      ],
    },
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.ZoneOperationsClient();

  // 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 created.');
}

createWithExistingDisks();

  9. (Facoltativo) Elimina gli snapshot temporanei del disco. Dopo aver confermato che le macchine virtuali sono state spostate, risparmia sui costi di archiviazione eliminando gli snapshot temporanei che hai creato.

    compute/snapshots/deleteSnapshot.js 
    /**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const snapshotName = 'YOUR_SNAPSHOT_NAME';

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

async function deleteSnapshot() {
  const snapshotsClient = new compute.SnapshotsClient();

  const [response] = await snapshotsClient.delete({
    project: projectId,
    snapshot: snapshotName,
  });
  let operation = response.latestResponse;
  const operationsClient = new compute.GlobalOperationsClient();

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

  console.log('Snapshot deleted.');
}

deleteSnapshot();

Python

  1. Ottieni i dettagli della VM e identifica i dischi collegati alla VM.

    compute/client_library/snippets/instances/get.py 
    from google.cloud import compute_v1

def get_instance(project_id: str, zone: str, instance_name: str) -> compute_v1.Instance:
    """
    Get information about a VM instance in the given zone in the specified project.

    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 VM instance you want to query.
    Returns:
        An Instance object.
    """
    instance_client = compute_v1.InstancesClient()
    instance = instance_client.get(
        project=project_id, zone=zone, instance=instance_name
    )

    return instance

  2. Imposta lo stato di eliminazione automatica del disco di avvio e del disco dati su false per assicurarti che i dischi non vengano eliminati automaticamente quando viene eliminata la VM.

    compute/client_library/snippets/disks/autodelete_change.py 
    import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 set_disk_autodelete(
    project_id: str, zone: str, instance_name: str, disk_name: str, autodelete: bool
) -> None:
    """
    Set the autodelete flag of a disk to given value.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone in which is the disk you want to modify.
        instance_name: name of the instance the disk is attached to.
        disk_name: the name of the disk which flag you want to modify.
        autodelete: the new value of the autodelete flag.
    """
    instance_client = compute_v1.InstancesClient()
    instance = instance_client.get(
        project=project_id, zone=zone, instance=instance_name
    )

    for disk in instance.disks:
        if disk.device_name == disk_name:
            break
    else:
        raise RuntimeError(
            f"Instance {instance_name} doesn't have a disk named {disk_name} attached."
        )

    disk.auto_delete = autodelete

    operation = instance_client.update(
        project=project_id,
        zone=zone,
        instance=instance_name,
        instance_resource=instance,
    )

    wait_for_extended_operation(operation, "disk update")

  3. Crea backup dei dati utilizzando gli snapshot di dischi permanenti.

    Per precauzione, crea backup dei tuoi dati mentre i dischi permanenti sono ancora collegati alla VM tramite snapshot di dischi permanenti. Prima di acquisire uno snapshot, assicurati che sia coerente con lo stato del disco permanente rispettando le best practice relative agli snapshot.

    Dopo aver cancellato i buffer del disco, crea gli snapshot:

    compute/client_library/snippets/snapshots/create.py 
    import sys
from typing import Any, Optional

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 create_snapshot(
    project_id: str,
    disk_name: str,
    snapshot_name: str,
    *,
    zone: Optional[str] = None,
    region: Optional[str] = None,
    location: Optional[str] = None,
    disk_project_id: Optional[str] = None,
) -> compute_v1.Snapshot:
    """
    Create a snapshot of a disk.

    You need to pass `zone` or `region` parameter relevant to the disk you want to
    snapshot, but not both. Pass `zone` parameter for zonal disks and `region` for
    regional disks.

    Args:
        project_id: project ID or project number of the Cloud project you want
            to use to store the snapshot.
        disk_name: name of the disk you want to snapshot.
        snapshot_name: name of the snapshot to be created.
        zone: name of the zone in which is the disk you want to snapshot (for zonal disks).
        region: name of the region in which is the disk you want to snapshot (for regional disks).
        location: The Cloud Storage multi-region or the Cloud Storage region where you
            want to store your snapshot.
            You can specify only one storage location. Available locations:
            https://cloud.google.com/storage/docs/locations#available-locations
        disk_project_id: project ID or project number of the Cloud project that
            hosts the disk you want to snapshot. If not provided, will look for
            the disk in the `project_id` project.

    Returns:
        The new snapshot instance.
    """
    if zone is None and region is None:
        raise RuntimeError(
            "You need to specify `zone` or `region` for this function to work."
        )
    if zone is not None and region is not None:
        raise RuntimeError("You can't set both `zone` and `region` parameters.")

    if disk_project_id is None:
        disk_project_id = project_id

    if zone is not None:
        disk_client = compute_v1.DisksClient()
        disk = disk_client.get(project=disk_project_id, zone=zone, disk=disk_name)
    else:
        regio_disk_client = compute_v1.RegionDisksClient()
        disk = regio_disk_client.get(
            project=disk_project_id, region=region, disk=disk_name
        )

    snapshot = compute_v1.Snapshot()
    snapshot.source_disk = disk.self_link
    snapshot.name = snapshot_name
    if location:
        snapshot.storage_locations = [location]

    snapshot_client = compute_v1.SnapshotsClient()
    operation = snapshot_client.insert(project=project_id, snapshot_resource=snapshot)

    wait_for_extended_operation(operation, "snapshot creation")

    return snapshot_client.get(project=project_id, snapshot=snapshot_name)

  4. Elimina la VM dalla zona di origine.

    compute/client_library/snippets/instances/delete.py 
    import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 delete_instance(project_id: str, zone: str, machine_name: str) -> None:
    """
    Send an instance deletion request to the Compute Engine API and wait for it to complete.

    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”
        machine_name: name of the machine you want to delete.
    """
    instance_client = compute_v1.InstancesClient()

    print(f"Deleting {machine_name} from {zone}...")
    operation = instance_client.delete(
        project=project_id, zone=zone, instance=machine_name
    )
    wait_for_extended_operation(operation, "instance deletion")
    print(f"Instance {machine_name} deleted.")

  5. Successivamente, crea un altro snapshot sia del disco di avvio sia dei dischi di dati.

    compute/client_library/snippets/snapshots/create.py 
    import sys
from typing import Any, Optional

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 create_snapshot(
    project_id: str,
    disk_name: str,
    snapshot_name: str,
    *,
    zone: Optional[str] = None,
    region: Optional[str] = None,
    location: Optional[str] = None,
    disk_project_id: Optional[str] = None,
) -> compute_v1.Snapshot:
    """
    Create a snapshot of a disk.

    You need to pass `zone` or `region` parameter relevant to the disk you want to
    snapshot, but not both. Pass `zone` parameter for zonal disks and `region` for
    regional disks.

    Args:
        project_id: project ID or project number of the Cloud project you want
            to use to store the snapshot.
        disk_name: name of the disk you want to snapshot.
        snapshot_name: name of the snapshot to be created.
        zone: name of the zone in which is the disk you want to snapshot (for zonal disks).
        region: name of the region in which is the disk you want to snapshot (for regional disks).
        location: The Cloud Storage multi-region or the Cloud Storage region where you
            want to store your snapshot.
            You can specify only one storage location. Available locations:
            https://cloud.google.com/storage/docs/locations#available-locations
        disk_project_id: project ID or project number of the Cloud project that
            hosts the disk you want to snapshot. If not provided, will look for
            the disk in the `project_id` project.

    Returns:
        The new snapshot instance.
    """
    if zone is None and region is None:
        raise RuntimeError(
            "You need to specify `zone` or `region` for this function to work."
        )
    if zone is not None and region is not None:
        raise RuntimeError("You can't set both `zone` and `region` parameters.")

    if disk_project_id is None:
        disk_project_id = project_id

    if zone is not None:
        disk_client = compute_v1.DisksClient()
        disk = disk_client.get(project=disk_project_id, zone=zone, disk=disk_name)
    else:
        regio_disk_client = compute_v1.RegionDisksClient()
        disk = regio_disk_client.get(
            project=disk_project_id, region=region, disk=disk_name
        )

    snapshot = compute_v1.Snapshot()
    snapshot.source_disk = disk.self_link
    snapshot.name = snapshot_name
    if location:
        snapshot.storage_locations = [location]

    snapshot_client = compute_v1.SnapshotsClient()
    operation = snapshot_client.insert(project=project_id, snapshot_resource=snapshot)

    wait_for_extended_operation(operation, "snapshot creation")

    return snapshot_client.get(project=project_id, snapshot=snapshot_name)

  6. (Facoltativo) Elimina i dischi permanenti.

    Se prevedi di riutilizzare i nomi dei dischi permanenti per i nuovi dischi, devi eliminare i dischi esistenti per rilasciarli. L'eliminazione dei dischi consente inoltre di risparmiare sui costi di archiviazione dei dischi permanenti.

    Se non prevedi di riutilizzare gli stessi nomi dei dischi, non è necessario eliminarli.

    compute/client_library/snippets/disks/delete.py 
    import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 delete_disk(project_id: str, zone: str, disk_name: str) -> None:
    """
    Deletes a disk from a project.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone in which is the disk you want to delete.
        disk_name: name of the disk you want to delete.
    """
    disk_client = compute_v1.DisksClient()
    operation = disk_client.delete(project=project_id, zone=zone, disk=disk_name)
    wait_for_extended_operation(operation, "disk deletion")

  7. Crea nuovi dischi permanenti nella zona di destinazione dagli snapshot che hai creato. Prima crea il disco di avvio, poi i dischi dati.

    compute/client_library/snippets/disks/create_from_snapshot.py 
    import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 create_disk_from_snapshot(
    project_id: str,
    zone: str,
    disk_name: str,
    disk_type: str,
    disk_size_gb: int,
    snapshot_link: str,
) -> compute_v1.Disk:
    """
    Creates a new disk in a project in given zone.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone in which you want to create the disk.
        disk_name: name of the disk you want to create.
        disk_type: the type of disk you want to create. This value uses the following format:
            "zones/{zone}/diskTypes/(pd-standard|pd-ssd|pd-balanced|pd-extreme)".
            For example: "zones/us-west3-b/diskTypes/pd-ssd"
        disk_size_gb: size of the new disk in gigabytes
        snapshot_link: a link to the snapshot you want to use as a source for the new disk.
            This value uses the following format: "projects/{project_name}/global/snapshots/{snapshot_name}"

    Returns:
        An unattached Disk instance.
    """
    disk_client = compute_v1.DisksClient()
    disk = compute_v1.Disk()
    disk.zone = zone
    disk.size_gb = disk_size_gb
    disk.source_snapshot = snapshot_link
    disk.type_ = disk_type
    disk.name = disk_name
    operation = disk_client.insert(project=project_id, zone=zone, disk_resource=disk)

    wait_for_extended_operation(operation, "disk creation")

    return disk_client.get(project=project_id, zone=zone, disk=disk_name)

  8. Ricrea la VM con i nuovi dischi nella zona di destinazione.

    compute/client_library/snippets/instances/create_start_instance/create_with_existing_disks.py 
    import re
import sys
from typing import Any, List
import warnings

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

def get_disk(project_id: str, zone: str, disk_name: str) -> compute_v1.Disk:
    """
    Gets a disk from a project.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone where the disk exists.
        disk_name: name of the disk you want to retrieve.
    """
    disk_client = compute_v1.DisksClient()
    return disk_client.get(project=project_id, zone=zone, disk=disk_name)

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 create_instance(
    project_id: str,
    zone: str,
    instance_name: str,
    disks: List[compute_v1.AttachedDisk],
    machine_type: str = "n1-standard-1",
    network_link: str = "global/networks/default",
    subnetwork_link: str = None,
    internal_ip: str = None,
    external_access: bool = False,
    external_ipv4: str = None,
    accelerators: List[compute_v1.AcceleratorConfig] = None,
    preemptible: bool = False,
    spot: bool = False,
    instance_termination_action: str = "STOP",
    custom_hostname: str = None,
    delete_protection: bool = False,
) -> compute_v1.Instance:
    """
    Send an instance creation request to the Compute Engine API and wait for it to complete.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone to create the instance in. For example: "us-west3-b"
        instance_name: name of the new virtual machine (VM) instance.
        disks: a list of compute_v1.AttachedDisk objects describing the disks
            you want to attach to your new instance.
        machine_type: machine type of the VM being created. This value uses the
            following format: "zones/{zone}/machineTypes/{type_name}".
            For example: "zones/europe-west3-c/machineTypes/f1-micro"
        network_link: name of the network you want the new instance to use.
            For example: "global/networks/default" represents the network
            named "default", which is created automatically for each project.
        subnetwork_link: name of the subnetwork you want the new instance to use.
            This value uses the following format:
            "regions/{region}/subnetworks/{subnetwork_name}"
        internal_ip: internal IP address you want to assign to the new instance.
            By default, a free address from the pool of available internal IP addresses of
            used subnet will be used.
        external_access: boolean flag indicating if the instance should have an external IPv4
            address assigned.
        external_ipv4: external IPv4 address to be assigned to this instance. If you specify
            an external IP address, it must live in the same region as the zone of the instance.
            This setting requires `external_access` to be set to True to work.
        accelerators: a list of AcceleratorConfig objects describing the accelerators that will
            be attached to the new instance.
        preemptible: boolean value indicating if the new instance should be preemptible
            or not. Preemptible VMs have been deprecated and you should now use Spot VMs.
        spot: boolean value indicating if the new instance should be a Spot VM or not.
        instance_termination_action: What action should be taken once a Spot VM is terminated.
            Possible values: "STOP", "DELETE"
        custom_hostname: Custom hostname of the new VM instance.
            Custom hostnames must conform to RFC 1035 requirements for valid hostnames.
        delete_protection: boolean value indicating if the new virtual machine should be
            protected against deletion or not.
    Returns:
        Instance object.
    """
    instance_client = compute_v1.InstancesClient()

    # Use the network interface provided in the network_link argument.
    network_interface = compute_v1.NetworkInterface()
    network_interface.name = network_link
    if subnetwork_link:
        network_interface.subnetwork = subnetwork_link

    if internal_ip:
        network_interface.network_i_p = internal_ip

    if external_access:
        access = compute_v1.AccessConfig()
        access.type_ = compute_v1.AccessConfig.Type.ONE_TO_ONE_NAT.name
        access.name = "External NAT"
        access.network_tier = access.NetworkTier.PREMIUM.name
        if external_ipv4:
            access.nat_i_p = external_ipv4
        network_interface.access_configs = [access]

    # Collect information into the Instance object.
    instance = compute_v1.Instance()
    instance.network_interfaces = [network_interface]
    instance.name = instance_name
    instance.disks = disks
    if re.match(r"^zones/[a-z\d\-]+/machineTypes/[a-z\d\-]+$", machine_type):
        instance.machine_type = machine_type
    else:
        instance.machine_type = f"zones/{zone}/machineTypes/{machine_type}"

    if accelerators:
        instance.guest_accelerators = accelerators

    if preemptible:
        # Set the preemptible setting
        warnings.warn(
            "Preemptible VMs are being replaced by Spot VMs.", DeprecationWarning
        )
        instance.scheduling = compute_v1.Scheduling()
        instance.scheduling.preemptible = True

    if spot:
        # Set the Spot VM setting
        instance.scheduling = compute_v1.Scheduling()
        instance.scheduling.provisioning_model = (
            compute_v1.Scheduling.ProvisioningModel.SPOT.name
        )
        instance.scheduling.instance_termination_action = instance_termination_action

    if custom_hostname is not None:
        # Set the custom hostname for the instance
        instance.hostname = custom_hostname

    if delete_protection:
        # Set the delete protection bit
        instance.deletion_protection = True

    # Prepare the request to insert an instance.
    request = compute_v1.InsertInstanceRequest()
    request.zone = zone
    request.project = project_id
    request.instance_resource = instance

    # Wait for the create operation to complete.
    print(f"Creating the {instance_name} instance in {zone}...")

    operation = instance_client.insert(request=request)

    wait_for_extended_operation(operation, "instance creation")

    print(f"Instance {instance_name} created.")
    return instance_client.get(project=project_id, zone=zone, instance=instance_name)

def create_with_existing_disks(
    project_id: str, zone: str, instance_name: str, disk_names: List[str]
) -> compute_v1.Instance:
    """
    Create a new VM instance using selected disks. The first disk in disk_names will
    be used as boot disk.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone to create the instance in. For example: "us-west3-b"
        instance_name: name of the new virtual machine (VM) instance.
        disk_names: list of disk names to be attached to the new virtual machine.
            First disk in this list will be used as the boot device.

    Returns:
        Instance object.
    """
    assert len(disk_names) >= 1
    disks = [get_disk(project_id, zone, disk_name) for disk_name in disk_names]
    attached_disks = []
    for disk in disks:
        adisk = compute_v1.AttachedDisk()
        adisk.source = disk.self_link
        attached_disks.append(adisk)
    attached_disks[0].boot = True
    instance = create_instance(project_id, zone, instance_name, attached_disks)
    return instance

  9. (Facoltativo) Elimina gli snapshot temporanei del disco. Dopo aver confermato che le macchine virtuali sono state spostate, risparmia sui costi di archiviazione eliminando gli snapshot temporanei che hai creato.

    compute/client_library/snippets/snapshots/delete.py 
    import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1

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 delete_snapshot(project_id: str, snapshot_name: str) -> None:
    """
    Delete a snapshot of a disk.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        snapshot_name: name of the snapshot to delete.
    """

    snapshot_client = compute_v1.SnapshotsClient()
    operation = snapshot_client.delete(project=project_id, snapshot=snapshot_name)

    wait_for_extended_operation(operation, "snapshot deletion")

Passaggi successivi