Updated on 2025-10-16 GMT+08:00

Updating BMS Metadata (Deprecated)

This API is used to update BMS metadata.

If the metadata does not contain the target field, the field is automatically added to the field.
If the metadata contains the target field, the field value is automatically updated.

This API has been deprecated. Use the API in Updating BMS Metadata.

The BMS OS-EXT-STS:vm_state attribute (BMS status) must be active, stopped, or paused.

POST /v2.1/{project_id}/servers/{server_id}/metadata

Table 1 lists the parameters.

**Table 1** Parameter description
Parameter	Mandatory	Description
project_id	Yes	Specifies the project ID. For details about how to obtain the project ID, see Obtaining a Project ID.
server_id	Yes	Specifies the BMS ID. You can obtain the BMS ID from the BMS console or by calling the API Querying BMSs (Deprecated).

Parameter	Mandatory	Type	Description
metadata	Yes	Object	Specifies the user-defined metadata key and value pair. For details, see Table 2.

**Table 2** **metadata** data structure
Parameter	Mandatory	Type	Description
User-defined field key and value pair	Yes	String	Specifies the user-defined metadata key and value pair. Each key or value contains a maximum of 255 characters. The key does not support the following special characters: :`~!@#$%^&*()=+<,>?/'";{[]}\|\ The value does not support the following special characters: \"

Updating the metadata of a BMS (ID: 95bf2490-5428-432c-ad9b-5e3406f869dd) to customize a key-value pair

     POST https://{ECS Endpoint}/v2.1/c685484a8cc2416b97260938705deb65/servers/95bf2490-5428-432c-ad9b-5e3406f869dd/metadata

     {
    "metadata": {
        "key": "value"
    }
}
 
 
  

Parameter	Type	Description
metadata	Object	Specifies the user-defined metadata key and value pair. For details, see Table 3.

**Table 3** **metadata** data structure
Parameter	Type	Description
User-defined field key and value pair	String	Specifies the key and value pair of the metadata. Each key or value contains fewer than 256 characters and cannot be left blank. The value does not support the following special characters: \"

     {
    "metadata": {
        "key": "value"
    }
    }
 
 
  

Normal values

Returned Values	Description
200	The request has been successfully processed.

For details about other returned values, see Status Codes.

Parent topic: BMS Metadata Management (OpenStack Nova APIs)