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Compute Cloud API, gRPC: HostGroupService.Update

Written by
Updated at December 1, 2025

Updates the specified host group.

gRPC request

rpc Update (UpdateHostGroupRequest) returns (operation.Operation)

UpdateHostGroupRequest

{
  "host_group_id": "string",
  "update_mask": "google.protobuf.FieldMask",
  "name": "string",
  "description": "string",
  "labels": "map<string, string>",
  "maintenance_policy": "MaintenancePolicy",
  "scale_policy": {
    // Includes only one of the fields `fixed_scale`
    "fixed_scale": {
      "size": "int64"
    }
    // end of the list of possible fields
  }
}

Field

Description

host_group_id

string

Required field. ID of the host group to update.
To get the host group ID, use an HostGroupService.List request.

The maximum string length in characters is 50.

update_mask

google.protobuf.FieldMask

Field mask that specifies which fields of the HostGroup resource are going to be updated.

name

string

Name of the group.

Value must match the regular expression \|[a-z]([-_a-z0-9]{0,61}[a-z0-9])?.

description

string

Description of the group.

The maximum string length in characters is 256.

labels

object (map<string, string>)

Resource labels as key:value pairs.

The existing set of labels is completely replaced by the provided set.

No more than 64 per resource. The maximum string length in characters for each value is 63. Each value must match the regular expression [-_./\@0-9a-z]*. The string length in characters for each key must be 1-63. Each key must match the regular expression [a-z][-_./\@0-9a-z]*.

maintenance_policy

enum MaintenancePolicy

Behaviour on maintenance events

  • RESTART: Restart instance to move it to another host during maintenance
  • MIGRATE: Use live migration to move instance to another host during maintenance

scale_policy

ScalePolicy

Scale policy. Only fixed number of hosts are supported at this moment.

ScalePolicy

Field

Description

fixed_scale

FixedScale

Includes only one of the fields fixed_scale.

FixedScale

Field

Description

size

int64

operation.Operation

{
  "id": "string",
  "description": "string",
  "created_at": "google.protobuf.Timestamp",
  "created_by": "string",
  "modified_at": "google.protobuf.Timestamp",
  "done": "bool",
  "metadata": {
    "host_group_id": "string"
  },
  // Includes only one of the fields `error`, `response`
  "error": "google.rpc.Status",
  "response": {
    "id": "string",
    "folder_id": "string",
    "created_at": "google.protobuf.Timestamp",
    "name": "string",
    "description": "string",
    "labels": "map<string, string>",
    "zone_id": "string",
    "status": "Status",
    "type_id": "string",
    "maintenance_policy": "MaintenancePolicy",
    "scale_policy": {
      // Includes only one of the fields `fixed_scale`
      "fixed_scale": {
        "size": "int64"
      }
      // end of the list of possible fields
    }
  }
  // end of the list of possible fields
}

An Operation resource. For more information, see Operation.

Field

Description

id

string

ID of the operation.

description

string

Description of the operation. 0-256 characters long.

created_at

google.protobuf.Timestamp

Creation timestamp.

created_by

string

ID of the user or service account who initiated the operation.

modified_at

google.protobuf.Timestamp

The time when the Operation resource was last modified.

done

bool

If the value is false, it means the operation is still in progress.
If true, the operation is completed, and either error or response is available.

metadata

UpdateHostGroupMetadata

Service-specific metadata associated with the operation.
It typically contains the ID of the target resource that the operation is performed on.
Any method that returns a long-running operation should document the metadata type, if any.

error

google.rpc.Status

The error result of the operation in case of failure or cancellation.

Includes only one of the fields error, response.

The operation result.
If done == false and there was no failure detected, neither error nor response is set.
If done == false and there was a failure detected, error is set.
If done == true, exactly one of error or response is set.

response

HostGroup

The normal response of the operation in case of success.
If the original method returns no data on success, such as Delete,
the response is google.protobuf.Empty.
If the original method is the standard Create/Update,
the response should be the target resource of the operation.
Any method that returns a long-running operation should document the response type, if any.

Includes only one of the fields error, response.

The operation result.
If done == false and there was no failure detected, neither error nor response is set.
If done == false and there was a failure detected, error is set.
If done == true, exactly one of error or response is set.

UpdateHostGroupMetadata

Field

Description

host_group_id

string

ID of the host group that is being updated.

HostGroup

Represents group of dedicated hosts

Field

Description

id

string

ID of the group.

folder_id

string

ID of the folder that the group belongs to.

created_at

google.protobuf.Timestamp

Creation timestamp in RFC3339 text format.

name

string

Name of the group. The name is unique within the folder.

description

string

Description of the group.

labels

object (map<string, string>)

Resource labels as key:value pairs.

zone_id

string

Availability zone where all dedicated hosts are allocated.

status

enum Status

Status of the group.

  • CREATING
  • READY
  • UPDATING
  • DELETING

type_id

string

ID of host type. Resources provided by each host of the group.

maintenance_policy

enum MaintenancePolicy

Behaviour on maintenance events.

  • RESTART: Restart instance to move it to another host during maintenance
  • MIGRATE: Use live migration to move instance to another host during maintenance

scale_policy

ScalePolicy

Scale policy. Only fixed number of hosts are supported at this moment.

ScalePolicy

Field

Description

fixed_scale

FixedScale

Includes only one of the fields fixed_scale.

FixedScale

Field

Description

size

int64
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