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gcloud compute instances detach-disk

NAME
gcloud compute instances detach-disk - detach disks from Compute Engine virtual machine instances
SYNOPSIS
gcloud compute instances detach-disk INSTANCE_NAME (--device-name=DEVICE_NAME     | --disk=DISK) [--disk-scope=DISK_SCOPE; default="zonal"] [--zone=ZONE] [GCLOUD_WIDE_FLAG …]
DESCRIPTION
gcloud compute instances detach-disk is used to detach disks from virtual machines.

Detaching a disk without first unmounting it may result in incomplete I/O operations and data corruption. To unmount a persistent disk on a Linux-based image, ssh into the instance and run: 

sudo umount /dev/disk/by-id/google-DEVICE_NAME
EXAMPLES
To detach a disk named 'my-disk' from an instance named 'my-instance', run: 
gcloud compute instances detach-disk my-instance --disk=my-disk

To detach a device named 'my-device' from an instance named 'my-instance', run: 

gcloud compute instances detach-disk my-instance --device-name=my-device
POSITIONAL ARGUMENTS
INSTANCE_NAME
Name of the instance to operate on. For details on valid instance names, refer to the criteria documented under the field 'name' at: https://cloud.google.com/compute/docs/reference/rest/v1/instances
REQUIRED FLAGS
Exactly one of these must be specified:
--device-name=DEVICE_NAME
Specifies a disk to detach by its device name, which is the name that the guest operating system sees. The device name is set at the time that the disk is attached to the instance, and needs not be the same as the persistent disk name. If the disk's device name is specified, then its persistent disk name must not be specified using the --disk flag.
--disk=DISK
Specifies a disk to detach by its resource name. If you specify a disk to remove by persistent disk name, then you must not specify its device name using the --device-name flag.
OPTIONAL FLAGS
--disk-scope=DISK_SCOPE; default="zonal"
The scope of the disk. DISK_SCOPE must be one of:
regional
The disk specified in --disk is interpreted as a regional disk in the same region as the instance. Ignored if a full URI is provided to the --disk flag.
zonal
The disk specified in --disk is interpreted as a zonal disk in the same zone as the instance. Ignored if a full URI is provided to the --disk flag.
--zone=ZONE
Zone of the instance to operate on. If not specified, you might be prompted to select a zone (interactive mode only). gcloud attempts to identify the appropriate zone by searching for resources in your currently active project. If the zone cannot be determined, gcloud prompts you for a selection with all available Google Cloud Platform zones.

To avoid prompting when this flag is omitted, the user can set the compute/zone property: 

gcloud config set compute/zone ZONE

A list of zones can be fetched by running: 

gcloud compute zones list

To unset the property, run: 

gcloud config unset compute/zone
 Alternatively, the zone can be stored in the environment variable CLOUDSDK_COMPUTE_ZONE.
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.

NOTES
These variants are also available: 
gcloud alpha compute instances detach-disk
 
gcloud beta compute instances detach-disk
 
gcloud preview compute instances detach-disk