This API is used to modify specified BMS metadata.

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

PUT /v2.1/{project_id}/servers/{server_id}/metadata/{key}

Table 1 lists the parameters.

**Table 1** Parameter description
Parameter	Mandatory	Description
project_id	Yes	Specifies the project ID. For how to obtain the project ID, see Obtaining Required Information.
server_id	Yes	Specifies the BMS ID. You can obtain the BMS ID from the BMS console or using the Querying BMSs (Native OpenStack API) API.
key	Yes	Specifies the BMS metadata key value to be modified

Request parameters

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

**Table 2** **meta** field data structure description
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: \"

Example request

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

{
    "meta": {
        "key": "value"
    }
}

Response parameters

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

**Table 3** **meta** field data structure description
Parameter	Type	Description
User-defined field key and value pair	String	Specifies the user-defined metadata key and value pair. Each key or value contains a maximum of 255 characters.

Example response

{
    "meta": {
        "key": "value"
    }
} 

Normal values

Returned Values	Description
200	The request has been successfully processed.

For details about other returned values, see Status Codes.

Modifying Specified BMS Metadata (Native OpenStack API)