Help Center/ Elastic Cloud Server/ API Reference (Ankara Region)/ APIs (Recommended)/ Status Management/ Reinstalling an ECS OS (Using an Image with Cloud-Init Installed)
Updated on 2024-07-23 GMT+08:00
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Reinstalling an ECS OS (Using an Image with Cloud-Init Installed)

Function

This API is used to reinstall an ECS OS. During the system disk reinstallation using the original image, the data disks of the ECS remain unchanged.

This API is an asynchronous API. After the OS reinstallation request is successfully delivered, a job ID is returned. This does not mean the reinstallation 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 reinstallation is successful.

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

Constraints

  • You can only use an image with Cloud-Init or Cloudbase-Init installed. If the image has no Cloudbase-Init or Cloudbase-init installed, use the API described in Reinstalling an ECS OS (Using an Image Without Cloud-Init Installed).
  • You are not allowed to reinstall the OS of an ECS that does not have the system disk.
  • You are not allowed to perform other operations when reinstalling the OS. Otherwise, reinstalling the OS will fail.

URI

POST /v2/{project_id}/cloudservers/{server_id}/reinstallos

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-reinstall

Yes

Object

Reinstalls an ECS OS. For details, see Table 3.
Table 3 os-reinstall field description

Parameter

Mandatory

Type

Description

keyname

Yes

String

Specifies the key pair name.

userid

Yes

String

Specifies the user ID.

metadata

No

Object

Specifies metadata of the reinstalled ECS.

For more information, see Table 4.

mode

No

String

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

If the parameter value is withStopServer, the ECS supports OS reinstallation when the ECS is running. In such a case, the system automatically stops the ECS before reinstalling 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.

user_data

No

String

Specifies the user data to be injected to the ECS during the creation. Text and text files can be injected.

NOTE:
  • The content of user_data must be encoded with base64.
  • The maximum size of the content to be injected (before encoding) is 32 KB.

For more details, see "Injecting User Data into ECSs" in the Elastic Cloud Server User Guide.

Examples

Before base64 encoding:

  • Linux 
    #!/bin/bash
echo user_test > /home/user.txt
  • Windows 
    rem cmd
echo 111 > c:\aaa.txt

After base64 encoding:

  • Linux 
    IyEvYmluL2Jhc2gKZWNobyB1c2VyX3Rlc3QgPiAvaG9tZS91c2VyLnR4dA==
  • Windows 
    cmVtIGNtZAplY2hvIDExMSA+IGM6XGFhYS50eHQ=

Response

See Responses (Task).

Example Request

  • After the ECS OS is reinstalled, use the password for login authentication. For security purposes, store the password in ciphertext in configuration files or environment variables. 
    POST https://{endpoint}/v2/{project_id}/cloudservers/{server_id}/reinstallos

{
    "os-reinstall": {
        "userid": "7e25b1da389f4697a79df3a0e5bd494e",
        "mode": "withStopServer"
    }
}
  • Reinstall an OS and use the key pair for login authentication after the reinstallation. 
    POST https://{endpoint}/v2/{project_id}/cloudservers/{server_id}/reinstallos

{
    "os-reinstall": {
        "keyname": "KeyPair-350b", 
        "userid": "7e25b1da389f4697a79df3a0e5bd494e"
    }
}

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