Method: instances.attachDisk

Attaches an existing Disk resource to an instance. You must first create the disk before you can attach it. It is not possible to create and attach a disk at the same time. For more information, read Adding a persistent disk to your instance.

HTTP request

POST https://www.googleapis.com/compute/beta/projects/{project}/zones/{zone}/instances/{resourceId}/attachDisk

The URL uses Google API HTTP annotation syntax.

Path parameters

Parameters
project

string

Project ID for this request.

zone

string

The name of the zone for this request.

resourceId

string

The instance name for this request.

Query parameters

Parameters
requestId

string

An optional request ID to identify requests. Specify a unique request ID so that if you must retry your request, the server will know to ignore the request if it has already been completed.

For example, consider a situation where you make an initial request and the request times out. If you make the request again with the same request ID, the server can check if original operation with the same request ID was received, and if so, will ignore the second request. This prevents clients from accidentally creating duplicate commitments.

The request ID must be a valid UUID with the exception that zero UUID is not supported (00000000-0000-0000-0000-000000000000).

forceAttach

boolean

Whether to force attach the disk even if it's currently attached to another instance. This is only available for regional disks.

Request body

The request body contains data with the following structure:

JSON representation
{
  "type": enum,
  "mode": enum,
  "source": string,
  "deviceName": string,
  "index": number,
  "boot": boolean,
  "initializeParams": {
    "diskName": string,
    "sourceImage": string,
    "diskSizeGb": string,
    "diskType": string,
    "sourceImageEncryptionKey": {

      

      
    },
    "labels": {
      object
    },
    "description": string
  },
  "autoDelete": boolean,
  "licenses": [
    string
  ],
  "interface": enum,
  "guestOsFeatures": [
    {
      "type": enum
    }
  ],
  "diskEncryptionKey": {
    "rawKey": string,
    "rsaEncryptedKey": string,
    "kmsKeyName": string,
    "sha256": string
  },
  "kind": string
}
Fields
type

enum

Specifies the type of the disk, either SCRATCH or PERSISTENT. If not specified, the default is PERSISTENT.

mode

enum

The mode in which to attach this disk, either READ_WRITE or READ_ONLY. If not specified, the default is to attach the disk in READ_WRITE mode.

source

string

Specifies a valid partial or full URL to an existing Persistent Disk resource. When creating a new instance, one of initializeParams.sourceImage or disks.source is required except for local SSD.

If desired, you can also attach existing non-root persistent disks using this property. This field is only applicable for persistent disks.

Note that for InstanceTemplate, specify the disk name, not the URL for the disk.

Authorization requires one or more of the following Google IAM permissions on the specified resource source:

  • compute.disks.use
  • compute.disks.useReadOnly

deviceName

string

Specifies a unique device name of your choice that is reflected into the /dev/disk/by-id/google-* tree of a Linux operating system running within the instance. This name can be used to reference the device for mounting, resizing, and so on, from within the instance.

If not specified, the server chooses a default device name to apply to this disk, in the form persistent-disks-x, where x is a number assigned by Google Compute Engine. This field is only applicable for persistent disks.

index

number

[Output Only] A zero-based index to this disk, where 0 is reserved for the boot disk. If you have many disks attached to an instance, each disk would have a unique index number.

boot

boolean

Indicates that this is a boot disk. The virtual machine will use the first partition of the disk for its root filesystem.

initializeParams

object

[Input Only] Specifies the parameters for a new disk that will be created alongside the new instance. Use initialization parameters to create boot disks or local SSDs attached to the new instance.

This property is mutually exclusive with the source property; you can only define one or the other, but not both.

initializeParams.diskName

string

Specifies the disk name. If not specified, the default is to use the name of the instance. If the disk with the instance name exists already in the given zone/region, a new name will be automatically generated.

initializeParams.sourceImage

string

The source image to create this disk. When creating a new instance, one of initializeParams.sourceImage or disks.source is required except for local SSD.

To create a disk with one of the public operating system images, specify the image by its family name. For example, specify family/debian-9 to use the latest Debian 9 image:

projects/debian-cloud/global/images/family/debian-9

Alternatively, use a specific version of a public operating system image:

projects/debian-cloud/global/images/debian-9-stretch-vYYYYMMDD

To create a disk with a custom image that you created, specify the image name in the following format:

global/images/my-custom-image

You can also specify a custom image by its image family, which returns the latest version of the image in that family. Replace the image name with family/family-name:

global/images/family/my-image-family

If the source image is deleted later, this field will not be set.

Authorization requires one or more of the following Google IAM permissions on the specified resource source_image:

  • compute.disks.create
  • compute.images.useReadOnly

initializeParams.diskSizeGb

string (int64 format)

Specifies the size of the disk in base-2 GB.

initializeParams.diskType

string

Specifies the disk type to use to create the instance. If not specified, the default is pd-standard, specified using the full URL. For example:

https://www.googleapis.com/compute/v1/projects/project/zones/zone/diskTypes/pd-standard

Other values include pd-ssd and local-ssd. If you define this field, you can provide either the full or partial URL. For example, the following are valid values:

Note that for InstanceTemplate, this is the name of the disk type, not URL.

initializeParams.sourceImageEncryptionKey

object

The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.

Instance templates do not store customer-supplied encryption keys, so you cannot create disks for instances in a managed instance group if the source images are encrypted with your own keys.

initializeParams.sourceImageEncryptionKey.rawKey

string

Specifies a 256-bit customer-supplied encryption key, encoded in RFC 4648 base64 to either encrypt or decrypt this resource.

initializeParams.sourceImageEncryptionKey.rsaEncryptedKey

string

Specifies an RFC 4648 base64 encoded, RSA-wrapped 2048-bit customer-supplied encryption key to either encrypt or decrypt this resource.

The key must meet the following requirements before you can provide it to Compute Engine:

  1. The key is wrapped using a RSA public key certificate provided by Google.
  2. After being wrapped, the key must be encoded in RFC 4648 base64 encoding.
Gets the RSA public key certificate provided by Google at:
https://cloud-certs.storage.googleapis.com/google-cloud-csek-ingress.pem

initializeParams.sourceImageEncryptionKey.kmsKeyName

string

The name of the encryption key that is stored in Google Cloud KMS.

initializeParams.sourceImageEncryptionKey.sha256

string

[Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.

initializeParams.labels

map (key: string, value: string)

Labels to apply to this disk. These can be later modified by the disks.setLabels method. This field is only applicable for persistent disks.

An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.

initializeParams.description

string

An optional description. Provide this property when creating the disk.

autoDelete

boolean

Specifies whether the disk will be auto-deleted when the instance is deleted (but not when the disk is detached from the instance).

licenses[]

string

[Output Only] Any valid publicly visible licenses.

interface

enum

Specifies the disk interface to use for attaching this disk, which is either SCSI or NVME. The default is SCSI. Persistent disks must always use SCSI and the request will fail if you attempt to attach a persistent disk in any other format than SCSI. Local SSDs can use either NVME or SCSI. For performance characteristics of SCSI over NVMe, see Local SSD performance.

guestOsFeatures[]

object

A list of features to enable on the guest operating system. Applicable only for bootable images. Read Enabling guest operating system features to see a list of available options.

guestOsFeatures[].type

enum

The ID of a supported feature. Read Enabling guest operating system features to see a list of available options.

diskEncryptionKey

object

Encrypts or decrypts a disk using a customer-supplied encryption key.

If you are creating a new disk, this field encrypts the new disk using an encryption key that you provide. If you are attaching an existing disk that is already encrypted, this field decrypts the disk using the customer-supplied encryption key.

If you encrypt a disk using a customer-supplied key, you must provide the same key again when you attempt to use this resource at a later time. For example, you must provide the key when you create a snapshot or an image from the disk or when you attach the disk to a virtual machine instance.

If you do not provide an encryption key, then the disk will be encrypted using an automatically generated key and you do not need to provide a key to use the disk later.

Instance templates do not store customer-supplied encryption keys, so you cannot use your own keys to encrypt disks in a managed instance group.

diskEncryptionKey.rawKey

string

Specifies a 256-bit customer-supplied encryption key, encoded in RFC 4648 base64 to either encrypt or decrypt this resource.

diskEncryptionKey.rsaEncryptedKey

string

Specifies an RFC 4648 base64 encoded, RSA-wrapped 2048-bit customer-supplied encryption key to either encrypt or decrypt this resource.

The key must meet the following requirements before you can provide it to Compute Engine:

  1. The key is wrapped using a RSA public key certificate provided by Google.
  2. After being wrapped, the key must be encoded in RFC 4648 base64 encoding.
Gets the RSA public key certificate provided by Google at:
https://cloud-certs.storage.googleapis.com/google-cloud-csek-ingress.pem

diskEncryptionKey.kmsKeyName

string

The name of the encryption key that is stored in Google Cloud KMS.

diskEncryptionKey.sha256

string

[Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.

kind

string

[Output Only] Type of the resource. Always compute#attachedDisk for attached disks.

Response body

If successful, the response body contains data with the following structure:

An Operation resource, used to manage asynchronous API requests.

JSON representation
{
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "zone": string,
  "clientOperationId": string,
  "operationType": string,
  "targetLink": string,
  "targetId": string,
  "status": enum,
  "statusMessage": string,
  "user": string,
  "progress": number,
  "insertTime": string,
  "startTime": string,
  "endTime": string,
  "error": {
    "errors": [
      {
        "code": string,
        "location": string,
        "message": string
      }
    ]
  },
  "warnings": [
    {
      "code": enum,
      "message": string,
      "data": [
        {
          "key": string,
          "value": string
        }
      ]
    }
  ],
  "httpErrorStatusCode": number,
  "httpErrorMessage": string,
  "selfLink": string,
  "region": string,
  "description": string,
  "kind": string
}
Fields
id

string (fixed64 format)

[Output Only] The unique identifier for the resource. This identifier is defined by the server.

creationTimestamp

string

[Deprecated] This field is deprecated.

name

string

[Output Only] Name of the resource.

zone

string

[Output Only] The URL of the zone where the operation resides. Only available when performing per-zone operations. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.

clientOperationId

string

[Output Only] The value of requestId if you provided it in the request. Not present otherwise.

operationType

string

[Output Only] The type of operation, such as insert, update, or delete, and so on.

targetId

string (fixed64 format)

[Output Only] The unique target ID, which identifies a specific incarnation of the target resource.

status

enum

[Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.

statusMessage

string

[Output Only] An optional textual description of the current status of the operation.

user

string

[Output Only] User who requested the operation, for example: user@example.com.

progress

number

[Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.

insertTime

string

[Output Only] The time that this operation was requested. This value is in RFC3339 text format.

startTime

string

[Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.

endTime

string

[Output Only] The time that this operation was completed. This value is in RFC3339 text format.

error

object

[Output Only] If errors are generated during processing of the operation, this field will be populated.

error.errors[]

object

[Output Only] The array of errors encountered while processing this operation.

error.errors[].code

string

[Output Only] The error type identifier for this error.

error.errors[].location

string

[Output Only] Indicates the field in the request that caused the error. This property is optional.

error.errors[].message

string

[Output Only] An optional, human-readable error message.

warnings[]

object

[Output Only] If warning messages are generated during processing of the operation, this field will be populated.

warnings[].code

enum

[Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.

warnings[].message

string

[Output Only] A human-readable description of the warning code.

warnings[].data[]

object

[Output Only] Metadata about this warning in key: value format. For example:

"data": [  {  "key": "scope",  "value": "zones/us-east1-d"  }

warnings[].data[].key

string

[Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).

warnings[].data[].value

string

[Output Only] A warning data value corresponding to the key.

httpErrorStatusCode

number

[Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.

httpErrorMessage

string

[Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.

region

string

[Output Only] The URL of the region where the operation resides. Only available when performing regional operations. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.

description

string

[Output Only] A textual description of the operation, which is set when the operation is created.

kind

string

[Output Only] Type of the resource. Always compute#operation for Operation resources.

Authorization Scopes

Requires one of the following OAuth scopes:

  • https://www.googleapis.com/auth/compute
  • https://www.googleapis.com/auth/cloud-platform

For more information, see the Authentication Overview.

IAM Permissions

In addition to any permissions specified on the fields above, authorization requires one or more of the following Google IAM permissions:

  • compute.instances.attachDisk
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