Each metadata entry is stored on the metadata server as key-value pairs. Metadata keys are case sensitive. Your keys can be either predefined or custom metadata keys.
Custom metadata enables you to create and use your own metadata key-value pairs on an individual VM or a project. You can add new custom metadata keys, update the values of your existing keys, and remove any custom metadata entries when you don't need them. Setting custom metadata is useful for passing in arbitrary values to VMs in a project. It is also useful for creating startup and shutdown scripts.
This documents provides information about how to do the following:
Before you begin
- Review the basics of how VM metadata for Compute Engine is defined, categorized, and arranged. For more information, see About VM metadata.
-
If you haven't already, then set up authentication.
Authentication is
the process by which your identity is verified for access to Google Cloud services and APIs.
To run code or samples from a local development environment, you can authenticate to
Compute Engine by selecting one of the following options:
Select the tab for how you plan to use the samples on this page:
Console
When you use the Google Cloud console to access Google Cloud services and APIs, you don't need to set up authentication.
gcloud
-
Install the Google Cloud CLI, then initialize it by running the following command:
gcloud init
- Set a default region and zone.
REST
To use the REST API samples on this page in a local development environment, you use the credentials you provide to the gcloud CLI.
Install the Google Cloud CLI, then initialize it by running the following command:
gcloud init
For more information, see Authenticate for using REST in the Google Cloud authentication documentation.
-
Required roles
To get the permissions that you need to set or remove custom metadata on VMs, ask your administrator to grant you the following IAM roles:
-
Compute Instance Admin (v1) (
roles/compute.instanceAdmin.v1
) on the VM or project -
If your VMs use service accounts:
Service Account User (
roles/iam.serviceAccountUser
) on the service account or project
For more information about granting roles, see Manage access to projects, folders, and organizations.
These predefined roles contain the permissions required to set or remove custom metadata on VMs. To see the exact permissions that are required, expand the Required permissions section:
Required permissions
The following permissions are required to set or remove custom metadata on VMs:
-
If your VMs use service accounts:
iam.serviceAccounts.actAs
-
To add, update, or remove custom project metadata:
-
compute.projects.get
-
compute.projects.setCommonInstanceMetadata
-
-
To add, update, or remove custom zonal metadata:
-
compute.instanceSettings.get
-
compute.instanceSettings.update
-
-
To add, update, or remove custom instance metadata:
-
compute.instances.get
-
compute.instances.setMetadata
-
You might also be able to get these permissions with custom roles or other predefined roles.
Limitations
Compute Engine enforces a combined total limit of 512 KB for all
metadata entries. Maximum size limits are also applied to each key
and value
in the following way:
- Each metadata
key
has a maximum limit of 128 bytes. Each metadata
key
is case sensitive.For zonal metadata, Compute Engine doesn't allow you to create two separate metadata keys with the same string, even if they are written in different cases. For example, if you have an existing custom metadata key for zonal metadata called
project-zonal-metadata-key
, then, for zonal metadata in that zone, you can't create new metadata keys, such asProject-Zonal-Metadata-Key
,PROJECT-ZONAL-METADATA-KEY
, or any other variations of the same string.Each metadata
value
has a maximum limit of 256 KB.Each metadata
value
is case sensitive except for boolean values.
For example, SSH keys are stored as custom metadata under the ssh-keys
key. If your metadata content or value
for this key exceeds the 256 KB
limit, you won't be able to add more SSH keys. If you run into this limit,
consider removing unused keys
to free up metadata space for new keys.
Also, if you provide the startup or shutdown script contents directly, the contents of these startup and shutdown script contents might also be stored as custom metadata and count toward these size limitations. To avoid this, store your startup or shutdown script as a file hosted at an external location, such as Cloud Storage, and provide the startup script URL when creating a VM. This way, these files are downloaded onto the VM, rather than stored in the metadata server.
Boolean values
For fields that accept boolean values, TRUE
or FALSE
, the following values
can also be used:
Status | Alternative values |
---|---|
TRUE |
Y , Yes , 1 |
FALSE |
N , No , 0 |
Boolean values are not case-sensitive. For example, you can use False
, false
,
or FALSE
to disable a feature.
Set custom metadata on VMs
This section provides information about how to add new custom metadata, or update existing custom metadata values, for your Compute Engine VMs in one of the following ways:
- Set custom project metadata to add or update custom project metadata for all VMs in your project.
- Set custom zonal metadata to add or update custom metadata with a zonal scope for VMs within the project.
- Set custom instance metadata, to add or update custom instance metadata for a specific VM.
Set custom project metadata
You can add or update the custom metadata for all instances in a project by using the Google Cloud console, the Google Cloud CLI, or REST.
Use these instructions to apply metadata settings to all VMs in the project.
For example, if you define a project metadata pair of baz=bat
,
that metadata pair is automatically applied to all VMs in the project.
Console
In the Google Cloud console, go to the Metadata page.
Click
Edit at the top of the page.To add new custom project metadata entries, do the following:
- Navigate to the bottom of the page and click Add item.
- In the Key field, enter the name of your custom metadata key.
- In the Value field, enter the custom project metadata value.
- Optional. To add more custom project metadata entries, repeat the preceding steps for each metadata entry that you want to add.
- To finish adding your custom project metadata entries, click Save.
To edit existing custom project metadata entries, do the following:
- Navigate to that metadata entry that you want to edit.
- To update the name of a specific custom metadata key, in the Key field for that entry, enter the new name.
- To update the value of a custom project metadata entry, in the Value field for that entry, enter the new value.
- Optional. To remove a specific custom project metadata entry, click the delete icon next to the metadata entry.
- To edit multiple custom project metadata entries, repeat the preceding steps for each metadata entry that you want to edit.
- To finish editing your custom project metadata entries, click Save.
gcloud
Use the
project-info add-metadata
command.
gcloud compute project-info add-metadata \ --metadata=KEY=VALUE
Replace the following:
KEY
: the name of your metadata keyVALUE
: the value stored for this key
Example
For example to set two new entries foo=bar
and baz=bat
on a project, run
the following command:
gcloud compute project-info add-metadata \ --metadata=foo=bar,baz=bat
You can optionally specify one or more files from which to read
metadata by using the --metadata-from-file
flag.
REST
Optional. To perform optimistic locking, you can optionally provide a fingerprint.
A fingerprint is a random string of characters generated by Compute Engine. The fingerprint changes after each request, and if you provide a mismatched fingerprint, your request is rejected.
If you do not provide a fingerprint, no check for consistency is performed, and the
projects().setCommonInstanceMetadata
request succeeds. This behaviour is different frominstances().setMetadata
andinstanceSettings().patch
methods, where a fingerprint is always required.To get the current fingerprint of a project, call the
project().get
method.GET https://compute.googleapis.com/compute/v1/projects/PROJECT_ID
The output is similar to the following:
{ "name": "myproject", "commonInstanceMetadata": { "kind": "compute#metadata", "fingerprint": "FikclA7UBC0=", ... } }
Make a request to the
projects().setCommonInstanceMetadata
method and set your custom metadata key-value pairs:POST https://compute.googleapis.com/compute/v1/projects/PROJECT_ID/setCommonInstanceMetadata { "fingerprint": "FikclA7UBC0=", "items": [ { "key": "foo", "value": "bar" } ] }
Replace PROJECT_ID
with your your project ID.
Set custom zonal metadata
When you set custom zonal metadata, you add or update the zonal metadata entries for your VMs in a specific zone in a project. You can do the following by setting custom zonal metadata:
- Create new custom metadata keys for a specific zone in a project and set metadata for all VMs in that zone in that project.
- Update the values of existing custom zonal metadata entries for all VMs in a specific zone in a project.
- For existing custom metadata keys that have project metadata values, override those project metadata values in specific zones and instead set zonal metadata. After you set zonal metadata for those keys in a specific zone, all VMs in that zone in that project use the zonal metadata values for those keys.
Things to note before you set custom zonal metadata
Project and zonal metadata entries are stored in the same
project/
directory. If you set different values for the same custom
metadata keys for VMs on a project level and on a zonal level, then the
zonal metadata values for those keys take precedence over the
project metadata values in the respective zones.
- If you add a zonal metadata value for a metadata key that already
has a project metadata value, then Compute Engine overrides the project metadata
value for the VMs in this specified zone and updates the
/project
directory with the zonal value. - If you add a new project-wide metadata value for a metadata key that already
has a zonal metadata value, then nothing changes. Compute Engine retains the
zonal metadata value in the
/project
directory in the specific zone. - If you don't specify a zonal metadata value for a custom metadata key in a specific zone, but the key has a project metadata value, then your VMs continue to have the project metadata values in those zones.
Procedure
You can add or update the custom zonal metadata in a specific zone in a project by using the Google Cloud CLI or REST.
gcloud
To add or update custom zonal metadata, use the
gcloud compute project-zonal-metadata add
command.gcloud compute project-zonal-metadata add \ --zone=ZONE \ --project=PROJECT_ID \ --metadata=KEY1=VALUE1,KEY2=VALUE2,...
Replace the following:
PROJECT_ID
: your project IDZONE
: the zone where you want to add or update zonal metadata.KEY1
,KEY2
...: the custom metadata keys for which you want to add or update zonal metadata values.VALUE1
,VALUE2
...: the zonal metadata values that you want to set for your existing and new custom metadata keys. Depending on your custom metadata key and value, one of the following happens:If the corresponding custom metadata key is an existing key that has project metadata, then, in the specified zone, Compute Engine overrides the key's project metadata value with your specified zonal metadata value. All VMs in the specified zone in the project inherit this newly specified zonal metadata for that key and VMs in other zones continue to retain their prevailing project or zonal metadata values. If you make any future updates to the project metadata value for this key, then VMs in this zone in the project remain unaffected and continue to use the zonal metadata value for this key.
If the corresponding custom metadata key is a new metadata key that is not used for existing project or zonal metadata, then Compute Engine creates the custom metadata key and sets this value as the zonal metadata in the specified zone.
If the corresponding custom metadata key is an existing metadata key with a zonal metadata value in the specified zone:
- If the specified metadata value is a different from the existing value, then Compute Engine updates the zonal metadata entry with the new value.
- If the specified metadata value is same as the existing value, then the zonal metadata entry remains unchanged.
Example: Add a new custom zonal metadata entry
For example, consider a project called my-project
with the following
custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"value-1"
and"key-2":"value-2"
To add "key-4":"value-4"
as a new custom zonal metadata pair in
the us-central1-a
zone, run the following command
gcloud compute project-zonal-metadata add \ --metadata=key-4=value-4 \ --project=my-project \ --zone=us-central1-a
Example: Update the values of an existing custom zonal metadata entry
Consider the same example project my-project
, which now has the
following custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"value-1"
,"key-2":"value-2"
, and"key-4":"value-4"
To update the zonal metadata values of key-1
and key-4
in us-cerntral1-a
zone with new values, run the following command.
gcloud compute project-zonal-metadata add \ --metadata=key-1=new-value-1,key-4=new-value-4 \ --project=my-project \ --zone=us-central1-a
Example: Override the project metadata value for a key and use a zonal metadata value
Consider the same example project my-project
, which now has the
following custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"new-value-1"
,"key-2":"value-2"
, and"key-4":"new-value-4"
In this example project, consider key-3
, which has a project metadata
value of value-c
. Suppose you want to set a zonal metadata value
value-3
for this key for all VMs in the us-central1-a
zone. When you
perform the operation, for all the VMs in the us-central1-a
zone,
Compute Engine overrides the project metadata values and uses the
zonal metadata values. VMs in all other zones of the project retain their
prevailing project or zonal metadata values for key-3
.
To override the project metadata value for key-3
and set a zonal metadata
value, run the following command:
gcloud compute project-zonal-metadata add \ --metadata=key-3=value-3 \ --project=my-project \ --zone=us-central1-a
REST
Get the current fingerprint and view any existing key-value pairs for the project in that zone.
To perform optimistic locking, you must provide a fingerprint. A fingerprint is a random string of characters generated by Compute Engine. The fingerprint changes every time you make a request to add, update, or remove zonal metadata, and if you provide a mismatched fingerprint, Compute Engine rejects your request.
If you don't provide a fingerprint, a check for consistency is performed and your update request doesn't succeed. This works so that only one request can be made at a time, preventing collisions. This behavior matches
instances().setMetadata
, where a fingerprint is always required.To get the current fingerprint of the zonal metadata, make a
GET
request to theinstanceSettings().get
method.GET https://compute.googleapis.com/compute/v1/projects/PROJECT_ID/zones/ZONE/instanceSettings
Replace the following:
PROJECT_ID
: your project IDZONE
: the zone where you want to set the zonal metadata.
The following is an example output for this request:
{ "fingerprint": "VlRIl8dx9vk=", "metadata": { ... } }
To add or update the zonal metadata, make a
PATCH
request to theinstanceSettings().patch
method. You must provide the following with your request:An update mask. Use the
update_mask
query parameter. The update mask must contain the metadata keys for the following:- The new custom zonal metadata that you want to add
- The existing custom zonal metadata for which you want to update values
You must add the string
metadata.items.
as a prefix for each key—for example,metadata.items.key1,metadata.items.key3
.In the request body, provide the following:
- The metadata keys and values for the new custom zonal metadata that you want to add
- The metadata keys and values for the existing custom zonal metadata that you want to update
- The current fingerprint value
PATCH https://compute.googleapis.com/compute/v1/projects/PROJECT_ID/zones/ZONE/instanceSettings?update_mask=PREFIXED_METADATA_KEYS { "fingerprint": "FINGER_PRINT", "metadata": { "items": { "KEY1": "VALUE1", "KEY2": "VALUE2", ... } } }
Replace the following:
PROJECT_ID
: the ID of the project.ZONE
: the zone where you want to set the zonal metadata.PREFIXED_METADATA_KEYS
: the list of metadata keys for the following, where each key is prefixed with the stringmetadata.items.
:- The new custom zonal metadata that you want to add
- The existing custom zonal metadata for which you want to update values
For example, suppose your current zonal metadata keys in a specific zone are
key-1
andkey-2
. If you want to add a new key,key-3
, for zonal metadata in that zone and also update the zonal metadata for one of the existing keys,key-1
, then your update mask must have the following string:metadata.items.key1,metadata.items.key3
FINGER_PRINT
: the current fingerprint value.KEY1
,KEY2
...: the custom zonal metadata keys for which you want to add or update values. Specify all the custom zonal metadata keys that you specified in the update mask.VALUE1
,VALUE2
...: the zonal metadata values that you want to set for your existing and new custom metadata keys. Depending on your custom metadata key and value, one of the following happens:- If the corresponding custom metadata key is an existing key that has project metadata, then, in the specified zone, Compute Engine overrides the key's project metadata value with your specified zonal metadata value. All VMs in the specified zone in the project inherit this newly specified zonal metadata for that key and VMs in other zones continue to retain their prevailing project or zonal metadata values. If you make any future updates to the project metadata value for this key, then VMs in this zone in the project remain unaffected and continue to use the zonal metadata value for this key.
- If the corresponding custom metadata key is a new metadata key that is not used for existing project or zonal metadata, then Compute Engine creates the custom metadata key and sets this value as the zonal metadata in the specified zone.
If the corresponding custom metadata key is an existing metadata key with a zonal metadata value in the specified zone:
If the specified metadata value is a different from the existing value, then Compute Engine updates the zonal metadata entry with the new value.
If the specified metadata value is same as the existing value, then the zonal metadata entry remains unchanged.
Example: Add a new custom zonal metadata entry
For example, consider a project called my-project
with the following
custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"value-1"
and"key-2":"value-2"
To add "key-4":"value-4"
as a new custom zonal metadata pair in
the us-central1-a
zone, make the following PATCH
request:
PATCH https://compute.googleapis.com/compute/v1/projects/my-project/zones/us-central1-a/instanceSettings?update_mask=metadata.items.key-4 { "fingerprint": "VlRIl8dx9vk=", "metadata": { "items": { "key-4": "value-4" } } }
Example: Update the values of an existing custom zonal metadata entry
Consider the same example project my-project
, which now has the
following custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"value-1"
,"key-2":"value-2"
, and"key-4":"value-4"
To update the zonal metadata values of key-1
and key-4
in us-cerntral1-a
zone with new values, make the following PATCH
request:
PATCH https://compute.googleapis.com/compute/v1/projects/my-project/zones/us-central1-a/instanceSettings?update_mask=metadata.items.key-1,metadata.items.key-4 { "fingerprint": "VlRIl8dx9vk=", "metadata": { "items": { "key-1": "new-value-1", "key-4": "new-value-4" } } }
Example: Override the project metadata value for a key and set a zonal metadata value
Consider the same example project my-project
, which now has the
following custom metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"new-value-1"
,"key-2":"value-2"
, and"key-4":"new-value-4"
In this example project, consider key-3
, which has a project metadata
value of value-c
. Suppose you want to set a zonal metadata value
value-3
for this key for all VMs in the us-central1-a
zone. When you
perform the operation, for all the VMs in the us-central1-a
zone,
Compute Engine overrides the project metadata values and uses the
zonal metadata values. VMs in all other zones of the project retain their
prevailing project or zonal metadata values for key-3
.
To override the project metadata value for key-3
and use the zonal
metadata value value-3
instead, make the following PATCH
request:
PATCH https://compute.googleapis.com/compute/v1/projects/my-project/zones/us-central1-a/instanceSettings?update_mask=metadata.items.key-3 { "fingerprint": "VlRIl8dx9vk=", "metadata": { "items": { "key-3": "value-3" } } }
Set custom instance metadata
You can add or update the custom metadata for a single VM instance by using the Google Cloud console, the Google Cloud CLI, or REST.
You can set custom instance metadata in one of the following ways:
- For new VMs, you can add custom metadata when the VM is being created.
- For existing VMs, you can add or update custom metadata when the VM is running.
Add custom instance metadata during VM creation
Use these instructions to add metadata on a specific VM instance at the time of its creation.
Console
In the Google Cloud console, go to the Create an instance page.
Specify the VM details.
Expand the Advanced options section, and do the following:
- Expand the Management section.
- To add multiple key-value pairs for your custom metadata, in the Metadata section, click Add item.
To create the VM, click Create.
gcloud
To set custom metadata, use the
gcloud compute instances create
command
with the --metadata
flag.
gcloud compute instances create VM_NAME \ --metadata=KEY=VALUE
Replace the following:
VM_NAME
: the name of your VMKEY
: the name of your metadata keyVALUE
: the value stored for this key
Example
For example to set a new key foo
that has a value bar
on a
VM named example-instance
, run the following command:
gcloud compute instances create example-instance \ --metadata=foo=bar
REST
Use the
instances.insert
method
and provide the custom metadata as part of the metadata
property in
your request:
POST https://compute.googleapis.com/compute/v1/projects/PROJECT_ID
/zones/ZONE
/instances { "machineType": "zones/MACHINE_TYPE_ZONE/machineTypes/MACHINE_TYPE", "name": "VM_NAME
", "...": [ { } ], "metadata": { "items": [ { "key": "KEY", "value": "VALUE" } ] }, .. }
Replace the following:
PROJECT_ID
: your project IDZONE
: zone to create the VM inMACHINE_TYPE
: machine type, predefined or custom, for the new VMVM_NAME
: name of the new VMKEY
: the name of your metadata keyVALUE
: the value stored for this key
Add or update custom instance metadata on an existing VM
Use these instructions to update metadata on a specific VM instance that already exists.
Console
- In the Google Cloud console, go to the VM instances page.
- Click the instance for which you want to update metadata.
- Click the Edit button at the top of the page.
- Under Custom metadata, click Add item or edit the existing metadata entries.
- Save your changes.
gcloud
Updating VM metadata with the gcloud CLI is an additive action. Specify only the metadata keys that you want to add or change. If a key that you provided already exists, the value for that key is updated with the new value.
Use the
instances add-metadata
command:
gcloud compute instances add-metadata VM_NAME \ --metadata=KEY=VALUE,KEY=VALUE
Replace the following:
VM_NAME
: the name of your VMKEY
: the name of your metadata keyVALUE
: the value stored for this key
Examples
If you want to add the foo=bar
entry, use:
gcloud compute instances add-metadata VM_NAME \ --metadata=foo=bar
If you want to change the foo=bar
entry to foo=bat
, use:
gcloud compute instances add-metadata VM_NAME \ --metadata=foo=bat
REST
Get the current fingerprint and view any existing key-value pairs for the VM. To do this, call the
instances().get
method.A fingerprint is a random string of characters generated by Compute Engine and is used to perform optimistic locking. To update the VM, you need to provide the matching fingerprint value. The fingerprint changes after each request, and if you provide a mismatched fingerprint, your request is rejected. This works so that only one update can be made at a time, preventing collisions.
GET https://compute.googleapis.com/compute/v1/projects/
PROJECT_ID
/zones/ZONE
/instances/VM_NAMEReplace the following:
PROJECT_ID
: your project IDZONE
: the zone where your VM is locatedVM_NAME
: name of your VM
The output is similar to the following:
{ ... "name": "example-instance", "metadata": { "kind": "compute#metadata", "fingerprint": "zhma6O1w2l8=" "items": [ { "key": "foo", "value": "bar" } ] }, ... }
Make a request to the
instances().setMetadata
method. Provide a list of the new metadata values and the currentfingerprint
value.If the VM has existing key-value pairs that you want to keep, you must include them in this request with the new key-value pairs.
Example
POST https://compute.googleapis.com/compute/v1/projects/
PROJECT_ID
/zones/ZONE
/instances/VM_NAME/setMetadata { "fingerprint": "zhma6O1w2l8=", "items": [ { "key": "foo", "value": "bar" }, { "key": "baz", "value": "bat" } ] }Replace the following:
PROJECT_ID
: your project IDZONE
: the zone where your VM is locatedVM_NAME
: name of your VM
Remove custom metadata from VMs
This section provides information about how to remove custom metadata entries for your Compute Engine VMs in one of the following ways:
- Remove custom project metadata, to remove custom metadata that was set for all VMs in a project.
- Remove custom zonal metadata to remove custom metadata that was set for all VMs in a specific zone in a project.
- Remove custom instance metadata to remove VM metadata that was set for a specific VM.
Remove custom project metadata
You can remove custom project metadata by using the Google Cloud console or the Google Cloud CLI.
Console
In the Google Cloud console, go to the Metadata page.
Click
Edit at the top of the page.Navigate to the metadata entry that you want to remove and click the
delete button next to that entry.Repeat this step for each metadata entry that you want to remove.
To finish removing the custom project metadata entries, click Save.
gcloud
To remove custom project metadata, use the
gcloud compute project-info remove-metadata
command.
- If you want to remove the custom metadata entries for specific keys,
specify those keys by using the
--keys
flag, and exclude the values of those keys.
gcloud compute project-info remove-metadata \ --keys=KEY1,KEY2,...
- If you want to remove all custom metadata for the VM, specify the
--all
flag.
gcloud compute project-info remove-metadata \ --all
Replace the following:
KEY1
,KEY2
...: the custom instance metadata keys that you want to remove.
Remove custom zonal metadata
You can remove custom zonal metadata by using the Google Cloud CLI or REST.
gcloud
To remove custom zonal metadata, use the
gcloud compute project-zonal-metadata remove
command
and specify all the metadata keys that you want to remove by using the
--keys
flag.
gcloud compute project-zonal-metadata remove \ --project=PROJECT_ID \ --zone=ZONE \ --keys=KEY1,KEY2,...
Replace the following:
PROJECT_ID
: your project IDZONE
: the zone where you want to remove the zonal metadata.KEY1
,KEY2
...: the custom zonal metadata keys that you want to remove.
After you run the command, if any of the specified keys have project metadata values available, then the VMs in the specified zone inherit those project metadata values. If the metadata entry was set only at a zonal level and there isn't a corresponding project metadata value for that key, then VMs in that zone lose that metadata information.
Example:
Consider an example project my-project
, which has the following custom
project metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"new-value-1"
,"key-2":"value-2"
,"key-3":"value-3"
, and"key-4":"new-value-4"
To remove all the zonal metadata in the us-central1-a
zone, run the
following command.
gcloud compute project-zonal-metadata remove \ --metadata=key-1,key-2,key-3,key-4 \ --project=my-project \ --zone=us-central1-a
After you run the command, VMs in the us-central1-a
zone possess the
following custom project metadata entries:
"key-1":"value-a"
"key-2":"value-b"
"key-3":"value-c"
REST
Get the current fingerprint and view any existing key-value pairs for the project in that zone.
To perform optimistic locking, you must provide a fingerprint. A fingerprint is a random string of characters generated by Compute Engine. The fingerprint changes every time you make a request to add, update, or remove zonal metadata, and if you provide a mismatched fingerprint, Compute Engine rejects your request.
If you don't provide a fingerprint, a check for consistency is performed and your deletion request doesn't succeed. This works so that only one request can be made at a time, preventing collisions. This behavior matches
instances().setMetadata
, where a fingerprint is always required.To get the current fingerprint of a project, make a call the
instanceSettings().get
method.GET https://compute.googleapis.com/compute/beta/projects/PROJECT_ID/zones/ZONE/instanceSettings
Replace the following:
PROJECT_ID
: your project IDZONE
: the zone where you want to remove the zonal metadata.
The following is an example output for this request:
{ "fingerprint": "FikclA7UBC0=", "metadata": { ... } }
To remove custom zonal metadata, make a
PATCH
request to theinstanceSettings().patch
method by excluding the metadata keys, for which you want to remove the zonal metadata, from the request body. You must provide the following with your request:An update mask. Use the
update_mask
query parameter. The update mask must contain all the existing custom metadata keys for which you want to remove the zonal metadata. You must add the stringmetadata.items.
as a prefix for each key—for example,metadata.items.key1,metadata.items.key3
.In the request body, provide only the current fingerprint value. Exclude all the custom metadata keys that you specified in the update mask. If you include any of the metadata keys in both the update mask and the request body, then Compute Engine doesn't remove the zonal metadata for those keys.
PATCH https://compute.googleapis.com/compute/beta/projects/PROJECT_ID/zones/ZONE/instanceSettings?update_mask=PREFIXED_METADATA_KEYS { "fingerprint": "FINGER_PRINT", "metadata": { "items": { } } }
Replace the following:
PROJECT_ID
: the ID of the project.ZONE
: the zone where you want to remove the zonal metadata.PREFIXED_METADATA_KEYS
: the list of all the existing custom metadata keys for which you want to remove zonal metadata, where each key is prefixed with the stringmetadata.items.
. To ensure that your deletion request is successful, exclude these metadata keys from the request body. If you include any of the metadata keys in both the update mask and the request body, then Compute Engine doesn't remove the zonal metadata for those keys.For example, suppose your current metadata keys with zonal metadata are
key-1
,key-2
,key-3
, andkey-4
, and you want to remove the zonal metadata entries forkey-1
andkey-2
, then your update mask must have the following string:metadata.items.key1,metadata.items.key2
FINGER_PRINT
: the current fingerprint value.
After you make the request, if any of the specified keys have project metadata values available, then the VMs in the specified zone inherit those project metadata values. If the metadata key was set only at a zonal level and there isn't a corresponding project metadata value for that key, then VMs in that zone lose that metadata information.
Example:
Consider an example project my-project
, which has the following custom
project metadata:
- Project metadata:
"key-1":"value-a"
,"key-2":"value-b"
, and"key-3":"value-c"
- Zonal metadata in
us-central1-a
zone:"key-1":"new-value-1"
,"key-2":"value-2"
,"key-3":"value-3"
, and"key-4":"new-value-4"
To remove the zonal metadata for key-1
and key-2
in the
us-central1-a
zone, make the following PATCH
request.
PATCH https://compute.googleapis.com/compute/beta/projects/my-project/zones/us-central1-a/instanceSettings?update_mask=metadata.items.key-1,metadata.items.key-2 { "fingerprint": "FikclA7UBC0=", "metadata": { "items": { } } }
After this request goes through, VMs in the us-central1-a
zone possess the
following custom metadata. VMs inherit the project metadata values for
key-1
and key-2
, but retain the zonal metadata for key-3
and key-4
.
- Project metadata:
"key-1":"value-a"
and"key-2":"value-b"
- Zonal metadata in
us-central1-a
zone:"key-3":"value-3"
and"key-4":"new-value-4"
Remove custom instance metadata
You can remove custom instance metadata by using the Google Cloud console, the Google Cloud CLI or REST.
Console
- In the Google Cloud console, go to the VM instances page.
- In the Name column, click the name of the VM for which you want to remove metadata.
- Click Edit at the top of the page.
- In the Metadata section, click Delete item for each of the metadata entries that you want to remove.
- To confirm your changes and remove the custom instance metadata, click Save.
gcloud
To remove custom instance metadata, use the
gcloud compute instances remove-metadata
command.
- If you want to remove the custom metadata entries for specific keys,
specify those keys by using the
--keys
flag, and exclude the values of those keys.
gcloud compute instances remove-metadata VM_NAME \ --zone=ZONE \ --keys=KEY1,KEY2,...
- If you want to remove all custom metadata for the VM, specify the
--all
flag.
gcloud compute instances remove-metadata VM_NAME \ --zone=ZONE \ --all
Replace the following:
PROJECT_ID
: your project ID.ZONE
: the zone of your VM.VM_NAME
: name of your VMKEY1
,KEY2
...: the custom instance metadata keys that you want to remove.
REST
Get the current fingerprint and view any existing key-value pairs for the VM. To do this, call the
instances().get
method.A fingerprint is a random string of characters generated by Compute Engine and is used to perform optimistic locking. To update the VM, you need to provide the matching fingerprint value. The fingerprint changes after each request, and if you provide a mismatched fingerprint, your request is rejected. This works so that only one update can be made at a time, preventing collisions.
GET https://compute.googleapis.com/compute/v1/projects/
PROJECT_ID
/zones/ZONE
/instances/VM_NAMEReplace the following:
PROJECT_ID
: your project ID.ZONE
: the zone of your VM.VM_NAME
: name of your VM
The output is similar to the following:
{ ... "name": "example-instance", "metadata": { "kind": "compute#metadata", "fingerprint": "zhma6O1w2l8=" "items": [ { "key": "key-1", "value": "value-1" } { "key": "key-2", "value": "value-2" } ] }, ... }
Make a request to the
instances().setMetadata
method. You must include the current metadata fingerprint value for your request to succeed.To remove all custom metadata key-value pairs from a VM, in the
items
property, exclude the metadata keys for which you want to remove metadata values.POST https://compute.googleapis.com/compute/v1/projects/
PROJECT_ID
/zones/ZONE
/instances/VM_NAME/setMetadata { "fingerprint": "FINGER_PRINT" "items": [ { "key": "KEY1" "value": "VALUE1" } { "key": "KEY2" "value": "VALUE2" } ... ] }To remove all custom instance metadata on the VM, exclude the
items
property altogether.POST https://compute.googleapis.com/compute/v1/projects/
PROJECT_ID
/zones/ZONE
/instances/VM_NAME/setMetadata { "fingerprint": FINGER_PRINT }
Replace the following:
PROJECT_ID
: your project ID.ZONE
: the zone of your VM.VM_NAME
: name of your VMFINGER_PRINT
: the current fingerprint value.KEY1
,KEY2
...: the custom instance metadata keys that you want to remove.VALUE1
,VALUE2
...: the values of the custom instance metadata keys that you want to remove.
What's next
- Learn more about VM metadata.
- Learn how to view and query metadata.
- Learn more about running startup scripts or shutdown scripts in the metadata server.