Help Center/ Elastic Cloud Server/ API Reference (Ankara Region)/ APIs (Recommended)/ Status Management/ Changing an ECS OS (Using an Image Without Cloud-Init Installed)
Updated on 2024-04-16 GMT+08:00
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Changing an ECS OS (Using an Image Without Cloud-Init Installed)

Function

This API is used to change the OS of an ECS.

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

After this API is called, the system uninstalls the system disk, uses the new image to create a system disk, and attaches it to the ECS. In this way, the OS is changed.

This API supports the images without Cloud-Init or Cloudbase-Init installed. Otherwise, use the API described in Changing an ECS OS (Using an Image with Cloud-Init Installed).

Constraints

  • Only an ECS with a system disk supports changing OS.
  • You are not allowed to perform other operations when changing the OS. Otherwise, changing the OS will fail.

URI

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

Table 1 describes the parameters in the URI.
Table 1 Parameter description

Parameter

Mandatory

Description

project_id

Yes

Specifies the project ID.

For details about how to obtain the ID, see Obtaining a Project ID.

server_id

Yes

Specifies the ECS ID.

Request

Table 2 describes the request parameters.
Table 2 Request parameters

Parameter

Mandatory

Type

Description

os-change

Yes

Object

Changes the OS of an ECS. For details, see Table 3.
Table 3 os-change field description

Parameter

Mandatory

Type

Description

keyname

Yes

String

Specifies the key name.

userid

No

String

Specifies the user ID. When the keyname parameter is being specified, the value of this parameter is used preferentially. If this parameter is left blank, the user ID in the token is used by default.

imageid

Yes

String

Specifies the ID of the new image in UUID format.

You can obtain the image ID from the console or by following the instructions provided in "Querying Images" in Image Management Service API Reference.

metadata

No

Object

Specifies the metadata of the ECS for which the OS is to be changed.

For more information, see Table 4.

mode

No

String

Specifies whether the ECS supports OS change when the ECS is running.

If the parameter value is withStopServer, the ECS supports OS change when the ECS is running. In such a case, the system automatically stops the ECS before changing its OS.
Table 4 metadata field description

Parameter

Mandatory

Type

Description

BYOL

No

String

Specifies whether a user has the license of an image.

  • If this parameter is set to true, the license file delivered with the image is used, indicating that BYOL is used.
  • If this parameter is set to a value other than true, BYOL is not used, and the license file provided by the cloud platform must be used.

The default value is not true, indicating that BYOL is not used.

Response

For details, see Responses (Task).

Example Request

Change the OS and use the key pair for login authentication after the OS change.

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

{
    "os-change": {
        "keyname": "KeyPair-350b", 
        "userid": "7e25b1da389f4697a79df3a0e5bd494e", 
        "imageid": "e215580f-73ad-429d-b6f2-5433947433b0",
        "mode": "withStopServer"
    }
}

Example Response

See Responses (Task).

{      
    "job_id": "ff80808288d41e1b018990260955686a"
}

Returned Values

See Returned Values for General Requests.

Error Codes

See Error Codes.

Parent topic: Status Management