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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.

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 with 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

adminpass

No

String

Specifies the initial password of the ECS administrator.

The Windows administrator username is Administrator, and the Linux administrator username is root.

Password complexity requirements:

  • 8 to 26 characters
  • The password must contain at least three of the following character types: uppercase letters, lowercase letters, digits, and special characters (!@$%^-_=+[{}]:,./?~#*).
NOTE:
  • You can only log in to a Windows ECS using a username and password, and the password cannot contain the username, the username in reverse, or more than two characters in the same sequence as they appear in the username.
  • Either adminpass or keyname is empty.
  • Either adminpass or keyname is set.

keyname

No

String

Specifies the key name.

Keys can be created using the key creating API (Creating and Importing an SSH Key Pair) or obtained using the SSH key query API (Querying SSH Key Pairs).

userid

No

String

Specifies the user ID.

To view the user ID, perform the following steps:
  1. Log in to the management console.
  2. Click the username and select My Credentials from the drop-down list. View the user ID.

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.

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.

Response

For details, see Responses (Task).

Example Request

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).

Returned Values

See Returned Values for General Requests.

Error Codes

See Error Code Description.

Parent topic: Status Management