Function

ECS specifications can be modified, for example, upgrading the vCPUs and memory, to meet service requirements. This API is used to modify ECS specifications.

This API is an asynchronous API. After the specifications modification request is successfully delivered, a job ID is returned. This does not mean the modification is complete. You need to call the API by referring to Querying Job Execution Status to query the job status. The SUCCESS status indicates that the modification is successful.

An ECS flavor cannot be changed to certain flavors. For details, see Querying the Target Flavors to Which an ECS Flavor Can Be Changed.

Constraints

You can modify the ECS specifications only when the ECS is stopped.

URI

POST /v1/{project_id}/cloudservers/{server_id}/resize

Table 1 describes the parameters in the URI.

**Table 1** Parameter description
Parameter	Mandatory	Description
project_id	Yes	Specifies the project ID.
server_id	Yes	Specifies the ECS ID.

Request

Table 2 describes the request parameters.

**Table 2** Request parameters
Parameter	Mandatory	Type	Description
resize	Yes	Object	Definition Specifies the operation to modify ECS specifications. For details, see Table 3. Constraints N/A Range N/A Default Value N/A
dry_run	No	Boolean	Definition Specifies whether to check the request. If this parameter is set to true, no instance is created. Constraints N/A Range true: Check the request. Check items include the mandatory parameters and request format. If the check fails, the system returns an error. If the check is successful, the system returns status code 202. false: Send the request without checking the request body. Default Value false

**Table 3** **resize** field description
Parameter	Mandatory	Type	Description
flavorRef	Yes	String	Definition Specifies the flavor ID of the ECS after the modification. Constraints N/A Range N/A Default Value N/A

Response

Table 4 describes the response parameters.

**Table 4** Response parameters
Parameter	Type	Description
job_id	String	Definition Specifies the job ID returned after a job is delivered. The job ID can be used to query the job execution progress. For details about how to query the job execution status based on job_id, see Job Status Management. Range N/A

For details about abnormal responses, see Responses (Jobs).

Example Request

Change the ECS flavor to c3.15xlarge.2.

POST https://{endpoint}/v1/{project_id}/cloudservers/{server_id}/resize

{
    "resize": {
        "flavorRef": "c3.15xlarge.2"
    }
}

Example Response

{      
    "job_id": "ff80808288d41e1b018990260955686a" 
}

Returned Values

See Returned Values for General Requests.

Error Codes

See Error Codes.

Modifying the Specifications of an ECS