設定靜態外部 IP 位址

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	"google.golang.org/api/iterator"

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

// listRegionalExternal retrieves list external IP addresses in Google Cloud Platform region.
func listRegionalExternal(w io.Writer, projectID, region string) ([]*computepb.Address, error) {
	// projectID := "your_project_id"
	// region := "europe-west3"

	ctx := context.Background()
	// Create the service client.
	addressesClient, err := compute.NewAddressesRESTClient(ctx)
	if err != nil {
		return nil, err
	}
	defer addressesClient.Close()

	// Build the request.
	req := &computepb.ListAddressesRequest{
		Project: projectID,
		Region:  region,
	}

	// List the addresses.
	it := addressesClient.List(ctx, req)

	// Iterate over the results.
	var addresses []*computepb.Address
	for {
		address, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return nil, err
		}
		addresses = append(addresses, address)
	}

	// Print the addresses.
	fmt.Fprint(w, "Fetched addresses: \n")
	for _, address := range addresses {
		fmt.Fprintf(w, "%s\n", *address.Name)
	}

	return addresses, nil
}

// listGlobalExternal retrieves list external global IP addresses in Google Cloud Platform.
func listGlobalExternal(w io.Writer, projectID string) ([]*computepb.Address, error) {
	// projectID := "your_project_id"

	ctx := context.Background()
	// Create the service client.
	addressesClient, err := compute.NewGlobalAddressesRESTClient(ctx)
	if err != nil {
		return nil, err
	}
	defer addressesClient.Close()

	// Build the request.
	req := &computepb.ListGlobalAddressesRequest{
		Project: projectID,
	}

	// List the addresses.
	it := addressesClient.List(ctx, req)

	// Iterate over the results.
	var addresses []*computepb.Address
	for {
		address, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return nil, err
		}
		addresses = append(addresses, address)
	}

	// Print the addresses.
	fmt.Fprint(w, "Fetched addresses: \n")
	for _, address := range addresses {
		fmt.Fprintf(w, "%s\n", *address.Name)
	}

	return addresses, nil
}

import com.google.cloud.compute.v1.Address;
import com.google.cloud.compute.v1.AddressesClient;
import com.google.cloud.compute.v1.GlobalAddressesClient;
import com.google.cloud.compute.v1.ListAddressesRequest;
import com.google.cloud.compute.v1.ListGlobalAddressesRequest;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeoutException;

public class ListStaticExternalIp {

  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 Google Cloud project you want to use.
    String projectId = "your-project-id";
    // Region where the VM and IP is located.
    String region = "your-region-id";

    listStaticExternalIp(projectId, region);
  }

  // Lists all static external IP addresses, either regional or global.
  public static List<Address> listStaticExternalIp(String projectId, String region)
          throws IOException {
    // Use regional client if a region is specified
    if (region != null) {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      try (AddressesClient client = AddressesClient.create()) {
        ListAddressesRequest request = ListAddressesRequest.newBuilder()
                .setProject(projectId)
                .setRegion(region)
                .build();

        return Lists.newArrayList(client.list(request).iterateAll());
      }
    } else {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      try (GlobalAddressesClient client = GlobalAddressesClient.create()) {
        ListGlobalAddressesRequest request = ListGlobalAddressesRequest.newBuilder()
                .setProject(projectId)
                .build();

        return Lists.newArrayList(client.list(request).iterateAll());
      }
    }
  }
}

from typing import List, Optional

from google.cloud.compute_v1.services.addresses.client import AddressesClient
from google.cloud.compute_v1.services.global_addresses import GlobalAddressesClient
from google.cloud.compute_v1.types import Address


def list_static_ip_addresses(
    project_id: str, region: Optional[str] = None
) -> List[Address]:
    """
    Lists all static external IP addresses, either regional or global.

    Args:
    project_id (str): project ID.
    region (Optional[str]): The region of the IP addresses if regional. None if global.

    Returns:
    List[Address]: A list of Address objects containing details about the requested IPs.
    """
    if region:
        # Use regional client if a region is specified
        client = AddressesClient()
        addresses_iterator = client.list(project=project_id, region=region)
    else:
        # Use global client if no region is specified
        client = GlobalAddressesClient()
        addresses_iterator = client.list(project=project_id)

    return list(addresses_iterator)  # Convert the iterator to a list to return

resource "google_compute_instance" "default" {
  name         = "dns-proxy-nfs"
  machine_type = "n1-standard-1"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "ubuntu-1404-trusty-v20160627"
    }
  }

  network_interface {
    network = "default"
    access_config {
      nat_ip = google_compute_address.default.address
    }
  }
}

// assignStaticExternalToNewVM creates a new VM instance and assigns a static external IP address to it.
// NOTE: ip address is expected to exist and be located in the same region as new VM
func assignStaticExternalToNewVM(w io.Writer, projectID, zone, instanceName, ipAddress string) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	// instanceName := "your_instance_name"
	// ipAddress := 301.222.11.123

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

	imagesClient, err := compute.NewImagesRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewImagesRESTClient: %w", err)
	}
	defer imagesClient.Close()

	// List of public operating system (OS) images: https://cloud.google.com/compute/docs/images/os-details.
	newestDebianReq := &computepb.GetFromFamilyImageRequest{
		Project: "debian-cloud",
		Family:  "debian-12",
	}
	newestDebian, err := imagesClient.GetFromFamily(ctx, newestDebianReq)
	if err != nil {
		return fmt.Errorf("unable to get image from family: %w", err)
	}

	req := &computepb.InsertInstanceRequest{
		Project: projectID,
		Zone:    zone,
		InstanceResource: &computepb.Instance{
			Name: proto.String(instanceName),
			Disks: []*computepb.AttachedDisk{
				{
					InitializeParams: &computepb.AttachedDiskInitializeParams{
						DiskSizeGb:  proto.Int64(10),
						SourceImage: newestDebian.SelfLink,
						DiskType:    proto.String(fmt.Sprintf("zones/%s/diskTypes/pd-standard", zone)),
					},
					AutoDelete: proto.Bool(true),
					Boot:       proto.Bool(true),
					Type:       proto.String(computepb.AttachedDisk_PERSISTENT.String()),
				},
			},
			MachineType: proto.String(fmt.Sprintf("zones/%s/machineTypes/n1-standard-1", zone)),
			NetworkInterfaces: []*computepb.NetworkInterface{
				{
					AccessConfigs: []*computepb.AccessConfig{
						{
							Type:        proto.String(computepb.AccessConfig_ONE_TO_ONE_NAT.String()),
							Name:        proto.String("External NAT"),
							NetworkTier: proto.String(computepb.AccessConfig_PREMIUM.String()),
							NatIP:       proto.String(ipAddress),
						},
					},
				},
			},
		},
	}

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

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

	fmt.Fprintf(w, "Static address %s assigned to new VM", ipAddress)

	return nil
}

import com.google.cloud.compute.v1.AccessConfig;
import com.google.cloud.compute.v1.AccessConfig.Type;
import com.google.cloud.compute.v1.Address.NetworkTier;
import com.google.cloud.compute.v1.AttachedDisk;
import com.google.cloud.compute.v1.AttachedDiskInitializeParams;
import com.google.cloud.compute.v1.GetInstanceRequest;
import com.google.cloud.compute.v1.ImagesClient;
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 java.io.IOException;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class AssignStaticExternalNewVmAddress {

  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 Google Cloud project you want to use.
    String projectId = "your-project-id";
    // Instance ID of the Google Cloud project you want to use.
    String instanceId = "your-instance-id";
    // Name of the zone to create the instance in. For example: "us-west3-b"
    String zone = "your-zone-id";
    // 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"
    String machineType = String.format("zones/%s/machineTypes/{your-machineType-id}", zone);
    // boolean flag indicating if the instance should have an external IPv4 address assigned.
    boolean externalAccess = true;
    // 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.
    String externalIpv4 = "your-externalIpv4-id";

    assignStaticExternalNewVmAddress(projectId, instanceId, zone,
            externalAccess, machineType, externalIpv4);
  }

  // Create a new VM instance with assigned static external IP address.
  public static Instance assignStaticExternalNewVmAddress(String projectId, String instanceName,
                                                          String zone, boolean externalAccess,
                                                          String machineType, String externalIpv4)
          throws IOException, ExecutionException, InterruptedException, TimeoutException {
    String sourceImage;
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (ImagesClient imagesClient = ImagesClient.create()) {
      sourceImage = imagesClient.getFromFamily("debian-cloud", "debian-11").getSelfLink();
    }
    AttachedDisk attachedDisk = buildAttachedDisk(sourceImage, zone);

    return createInstance(projectId, instanceName, zone,
            attachedDisk, machineType, externalAccess, externalIpv4);
  }

  private static AttachedDisk buildAttachedDisk(String sourceImage, String zone) {
    AttachedDiskInitializeParams initializeParams = AttachedDiskInitializeParams.newBuilder()
            .setSourceImage(sourceImage)
            .setDiskSizeGb(10)
            .setDiskType(String.format("zones/%s/diskTypes/pd-standard", zone))
            .build();

    return AttachedDisk.newBuilder()
            .setInitializeParams(initializeParams)
            // Remember to set auto_delete to True if you want the disk to be deleted
            // when you delete your VM instance.
            .setAutoDelete(true)
            .setBoot(true)
            .build();
  }

  // Send an instance creation request to the Compute Engine API and wait for it to complete.
  private static Instance createInstance(String projectId, String instanceName,
                                         String zone, AttachedDisk disks,
                                         String machineType, boolean externalAccess,
                                         String externalIpv4)
          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.
    try (InstancesClient client = InstancesClient.create()) {
      Instance instanceResource =
              buildInstanceResource(instanceName, disks, machineType, externalAccess, externalIpv4);

      InsertInstanceRequest build = InsertInstanceRequest.newBuilder()
              .setProject(projectId)
              .setRequestId(UUID.randomUUID().toString())
              .setZone(zone)
              .setInstanceResource(instanceResource)
              .build();
      client.insertCallable().futureCall(build).get(60, TimeUnit.SECONDS);

      GetInstanceRequest getInstanceRequest = GetInstanceRequest.newBuilder()
              .setInstance(instanceName)
              .setProject(projectId)
              .setZone(zone)
              .build();

      return client.get(getInstanceRequest);
    }
  }

  private static Instance buildInstanceResource(String instanceName, AttachedDisk disk,
                                                String machineType, boolean externalAccess,
                                                String externalIpv4) {
    NetworkInterface networkInterface =
            networkInterface(externalAccess, externalIpv4);

    return Instance.newBuilder()
            .setName(instanceName)
            .addDisks(disk)
            .setMachineType(machineType)
            .addNetworkInterfaces(networkInterface)
            .build();
  }

  private static NetworkInterface networkInterface(boolean externalAccess, String externalIpv4) {
    NetworkInterface.Builder build = NetworkInterface.newBuilder()
            .setNetwork("global/networks/default");
    if (externalAccess) {
      AccessConfig.Builder accessConfig = AccessConfig.newBuilder()
              .setType(Type.ONE_TO_ONE_NAT.name())
              .setName("External NAT")
              .setNetworkTier(NetworkTier.PREMIUM.name());
      if (externalIpv4 != null) {
        accessConfig.setNatIP(externalIpv4);
      }
      build.addAccessConfigs(accessConfig.build());
    }

    return build.build();
  }
}

from __future__ import annotations

import re
import sys
from typing import Any
import warnings

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


def get_image_from_family(project: str, family: str) -> compute_v1.Image:
    """
    Retrieve the newest image that is part of a given family in a project.

    Args:
        project: project ID or project number of the Cloud project you want to get image from.
        family: name of the image family you want to get image from.

    Returns:
        An Image object.
    """
    image_client = compute_v1.ImagesClient()
    # List of public operating system (OS) images: https://cloud.google.com/compute/docs/images/os-details
    newest_image = image_client.get_from_family(project=project, family=family)
    return newest_image


def disk_from_image(
    disk_type: str,
    disk_size_gb: int,
    boot: bool,
    source_image: str,
    auto_delete: bool = True,
) -> compute_v1.AttachedDisk:
    """
    Create an AttachedDisk object to be used in VM instance creation. Uses an image as the
    source for the new disk.

    Args:
         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
        boot: boolean flag indicating whether this disk should be used as a boot disk of an instance
        source_image: source image to use when creating this disk. You must have read access to this disk. This can be one
            of the publicly available images or an image from one of your projects.
            This value uses the following format: "projects/{project_name}/global/images/{image_name}"
        auto_delete: boolean flag indicating whether this disk should be deleted with the VM that uses it

    Returns:
        AttachedDisk object configured to be created using the specified image.
    """
    boot_disk = compute_v1.AttachedDisk()
    initialize_params = compute_v1.AttachedDiskInitializeParams()
    initialize_params.source_image = source_image
    initialize_params.disk_size_gb = disk_size_gb
    initialize_params.disk_type = disk_type
    boot_disk.initialize_params = initialize_params
    # Remember to set auto_delete to True if you want the disk to be deleted when you delete
    # your VM instance.
    boot_disk.auto_delete = auto_delete
    boot_disk.boot = boot
    return boot_disk


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.network = 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}"

    instance.scheduling = compute_v1.Scheduling()
    if accelerators:
        instance.guest_accelerators = accelerators
        instance.scheduling.on_host_maintenance = (
            compute_v1.Scheduling.OnHostMaintenance.TERMINATE.name
        )

    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.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 assign_static_external_ip_to_new_vm(
    project_id: str, zone: str, instance_name: str, ip_address: str
) -> compute_v1.Instance:
    """
    Create a new VM instance with assigned static external IP address.

    Args:
        project_id (str): project ID or project number of the Cloud project you want to use.
        zone (str): name of the zone to create the instance in. For example: "us-west3-b"
        instance_name (str): name of the new virtual machine (VM) instance.
        ip_address(str): external address to be assigned to this instance. It must live in the same
        region as the zone of the instance and be precreated before function called.

    Returns:
        Instance object.
    """
    newest_debian = get_image_from_family(project="debian-cloud", family="debian-12")
    disk_type = f"zones/{zone}/diskTypes/pd-standard"
    disks = [disk_from_image(disk_type, 10, True, newest_debian.self_link, True)]
    instance = create_instance(
        project_id,
        zone,
        instance_name,
        disks,
        external_ipv4=ip_address,
        external_access=True,
    )
    return instance

import (
	"context"
	"fmt"
	"io"

	"google.golang.org/protobuf/proto"

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

// assignStaticAddressToExistingVM assigns a static external IP address to an existing VM instance.
// Note: VM and assigned IP must be in the same region.
func assignStaticAddressToExistingVM(w io.Writer, projectID, zone, instanceName, IPAddress, networkInterfaceName string) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	// instanceName := "your_instance_name"
	// IPAddress := "34.111.222.333"
	// networkInterfaceName := "nic0"

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

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

	instance, err := instancesClient.Get(ctx, reqGet)
	if err != nil {
		return fmt.Errorf("could not get instance: %w", err)
	}

	var networkInterface *computepb.NetworkInterface
	for _, ni := range instance.NetworkInterfaces {
		if *ni.Name == networkInterfaceName {
			networkInterface = ni
			break
		}
	}

	if networkInterface == nil {
		return fmt.Errorf("No network interface named '%s' found on instance %s", networkInterfaceName, instanceName)
	}

	var accessConfig *computepb.AccessConfig
	for _, ac := range networkInterface.AccessConfigs {
		if *ac.Type == computepb.AccessConfig_ONE_TO_ONE_NAT.String() {
			accessConfig = ac
			break
		}
	}

	if accessConfig != nil {
		// network interface is immutable - deletion stage is required in case of any assigned ip (static or ephemeral).
		reqDelete := &computepb.DeleteAccessConfigInstanceRequest{
			Project:          projectID,
			Zone:             zone,
			Instance:         instanceName,
			AccessConfig:     *accessConfig.Name,
			NetworkInterface: networkInterfaceName,
		}

		opDelete, err := instancesClient.DeleteAccessConfig(ctx, reqDelete)
		if err != nil {
			return fmt.Errorf("unable to delete access config: %w", err)
		}

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

	reqAdd := &computepb.AddAccessConfigInstanceRequest{
		Project:  projectID,
		Zone:     zone,
		Instance: instanceName,
		AccessConfigResource: &computepb.AccessConfig{
			NatIP: &IPAddress,
			Type:  proto.String(computepb.AccessConfig_ONE_TO_ONE_NAT.String()),
		},
		NetworkInterface: networkInterfaceName,
	}

	opAdd, err := instancesClient.AddAccessConfig(ctx, reqAdd)
	if err != nil {
		return fmt.Errorf("unable to add access config: %w", err)
	}

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

	fmt.Fprintf(w, "Static address %s assigned to the instance %s\n", IPAddress, instanceName)

	return nil
}

import com.google.cloud.compute.v1.AccessConfig;
import com.google.cloud.compute.v1.AccessConfig.Type;
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import com.google.cloud.compute.v1.NetworkInterface;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class AssignStaticExistingVm {

  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 Google Cloud project you want to use.
    String projectId = "your-project-id";
    // Instance ID of the Google Cloud project you want to use.
    String instanceId = "your-instance-id";
    // Name of the zone to create the instance in. For example: "us-west3-b"
    String zone = "your-zone-id";
    // Name of the network interface to assign.
    String netInterfaceName = "your-netInterfaceName-id";

    assignStaticExistingVmAddress(projectId, instanceId, zone, netInterfaceName);
  }

  // Updates or creates an access configuration for a VM instance to assign a static external IP.
  // As network interface is immutable - deletion stage is required
  // in case of any assigned ip (static or ephemeral).
  // VM and ip address must be created before calling this function.
  // IMPORTANT: VM and assigned IP must be in the same region.
  public static Instance assignStaticExistingVmAddress(String projectId, String instanceId,
                                                       String zone, String netInterfaceName)
          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.
    try (InstancesClient client = InstancesClient.create()) {
      Instance instance = client.get(projectId, zone, instanceId);

      NetworkInterface networkInterface = null;
      for (NetworkInterface netInterface : instance.getNetworkInterfacesList()) {
        if (netInterface.getName().equals(netInterfaceName)) {
          networkInterface = netInterface;
          break;
        }
      }

      if (networkInterface == null) {
        throw new IllegalArgumentException(
                String.format(
                        "No '{network_interface_name}' variable found on instance %s.",
                        instanceId)
        );
      }
      AccessConfig accessConfig = null;
      for (AccessConfig config : networkInterface.getAccessConfigsList()) {
        if (config.getType().equals(Type.ONE_TO_ONE_NAT.name())) {
          accessConfig = config;
          break;
        }
      }

      if (accessConfig != null) {
        // Delete the existing access configuration first
        client.deleteAccessConfigAsync(projectId, zone, instanceId,
                        accessConfig.getName(), netInterfaceName)
                .get(30, TimeUnit.SECONDS);
      }

      // Add a new access configuration with the new IP
      AccessConfig newAccessConfig = AccessConfig.newBuilder()
              // Leave this field undefined to use an IP from a shared ephemeral IP address pool
              // .setNatIP(ipAddress)
              .setType(Type.ONE_TO_ONE_NAT.name())
              .setName("external-nat")
              .build();

      client.addAccessConfigAsync(projectId, zone, instanceId, netInterfaceName, newAccessConfig)
              .get(30, TimeUnit.SECONDS);

      // return updated instance
      return client.get(projectId, zone, instanceId);
    }
  }
}

import uuid

from google.cloud.compute_v1 import InstancesClient
from google.cloud.compute_v1.types import AccessConfig
from google.cloud.compute_v1.types import AddAccessConfigInstanceRequest
from google.cloud.compute_v1.types import DeleteAccessConfigInstanceRequest


def assign_static_ip_to_existing_vm(
    project_id: str,
    zone: str,
    instance_name: str,
    ip_address: str,
    network_interface_name: str = "nic0",
):
    """
    Updates or creates an access configuration for a VM instance to assign a static external IP.
    As network interface is immutable - deletion stage is required in case of any assigned ip (static or ephemeral).
    VM and ip address must be created before calling this function.
    IMPORTANT: VM and assigned IP must be in the same region.

    Args:
        project_id (str): Project ID.
        zone (str): Zone where the VM is located.
        instance_name (str): Name of the VM instance.
        ip_address (str): New static external IP address to assign to the VM.
        network_interface_name (str): Name of the network interface to assign.

    Returns:
        google.cloud.compute_v1.types.Instance: Updated instance object.
    """
    client = InstancesClient()
    instance = client.get(project=project_id, zone=zone, instance=instance_name)
    network_interface = next(
        (ni for ni in instance.network_interfaces if ni.name == network_interface_name),
        None,
    )

    if network_interface is None:
        raise ValueError(
            f"No network interface named '{network_interface_name}' found on instance {instance_name}."
        )

    access_config = next(
        (ac for ac in network_interface.access_configs if ac.type_ == "ONE_TO_ONE_NAT"),
        None,
    )

    if access_config:
        # Delete the existing access configuration first
        delete_request = DeleteAccessConfigInstanceRequest(
            project=project_id,
            zone=zone,
            instance=instance_name,
            access_config=access_config.name,
            network_interface=network_interface_name,
            request_id=str(uuid.uuid4()),
        )
        delete_operation = client.delete_access_config(delete_request)
        delete_operation.result()

    # Add a new access configuration with the new IP
    add_request = AddAccessConfigInstanceRequest(
        project=project_id,
        zone=zone,
        instance=instance_name,
        network_interface="nic0",
        access_config_resource=AccessConfig(
            nat_i_p=ip_address, type_="ONE_TO_ONE_NAT", name="external-nat"
        ),
        request_id=str(uuid.uuid4()),
    )
    add_operation = client.add_access_config(add_request)
    add_operation.result()

    updated_instance = client.get(project=project_id, zone=zone, instance=instance_name)
    return updated_instance

import com.google.cloud.compute.v1.AccessConfig;
import com.google.cloud.compute.v1.AccessConfig.Type;
import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import com.google.cloud.compute.v1.NetworkInterface;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class UnassignStaticIpAddress {

  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 Google Cloud project you want to use.
    String projectId = "your-project-id";
    // Instance ID of the Google Cloud project you want to use.
    String instanceId = "your-instance-id";
    // Name of the zone to create the instance in. For example: "us-west3-b"
    String zone = "your-zone";
    // Name of the network interface to assign.
    String netInterfaceName = "your-netInterfaceName";

    unassignStaticIpAddress(projectId, instanceId, zone, netInterfaceName);
  }

  public static Instance unassignStaticIpAddress(String projectId, String instanceId,
                                                 String zone, String netInterfaceName)
          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.
    try (InstancesClient client = InstancesClient.create()) {
      Instance instance = client.get(projectId, zone, instanceId);
      NetworkInterface networkInterface = null;
      for (NetworkInterface netIterface : instance.getNetworkInterfacesList()) {
        if (netIterface.getName().equals(netInterfaceName)) {
          networkInterface = netIterface;
          break;
        }
      }

      if (networkInterface == null) {
        throw new IllegalArgumentException(
                String.format(
                        "No '{network_interface_name}' variable found on instance %s.",
                        instanceId)
        );
      }

      AccessConfig accessConfig = null;
      for (AccessConfig config : networkInterface.getAccessConfigsList()) {
        if (config.getType().equals(Type.ONE_TO_ONE_NAT.name())) {
          accessConfig = config;
          break;
        }
      }

      if (accessConfig != null) {
        // Delete the existing access configuration first
        client.deleteAccessConfigAsync(projectId, zone, instanceId,
                        accessConfig.getName(), netInterfaceName).get(30, TimeUnit.SECONDS);
      }

      // return updated instance
      return client.get(projectId, zone, instanceId);
    }
  }
}

import uuid

from google.cloud.compute_v1 import InstancesClient
from google.cloud.compute_v1.types import DeleteAccessConfigInstanceRequest


def unassign_static_ip_from_existing_vm(
    project_id: str,
    zone: str,
    instance_name: str,
    network_interface_name: str = "nic0",
):
    """
    Updates access configuration for a VM instance to unassign a static external IP.
    VM (and IP address in case of static IP assigned) must be created before calling this function.

    Args:
        project_id (str): Project ID.
        zone (str): Zone where the VM is located.
        instance_name (str): Name of the VM instance.
        network_interface_name (str): Name of the network interface to unassign.
    """
    client = InstancesClient()
    instance = client.get(project=project_id, zone=zone, instance=instance_name)
    network_interface = next(
        (ni for ni in instance.network_interfaces if ni.name == network_interface_name),
        None,
    )

    if network_interface is None:
        raise ValueError(
            f"No network interface named '{network_interface_name}' found on instance {instance_name}."
        )

    access_config = next(
        (ac for ac in network_interface.access_configs if ac.type_ == "ONE_TO_ONE_NAT"),
        None,
    )

    if access_config:
        # Delete the existing access configuration
        delete_request = DeleteAccessConfigInstanceRequest(
            project=project_id,
            zone=zone,
            instance=instance_name,
            access_config=access_config.name,
            network_interface=network_interface_name,
            request_id=str(uuid.uuid4()),
        )
        delete_operation = client.delete_access_config(delete_request)
        delete_operation.result()

    updated_instance = client.get(project=project_id, zone=zone, instance=instance_name)
    return updated_instance