Changing the OS

Scenarios

Changing an ECS OS will change the system disk attached to the ECS. After the changing, the system disk ID of the ECS will be changed, and the original system disk will be deleted.

If the OS running on an ECS cannot meet service requirements, change the ECS OS.

The public cloud supports changing between image types (public images, private images, and shared images) and between OSs. You can change your OS by changing your ECS image.

Constraints

Notes

Notes on Change Between Different OSs

Change between different OSs indicates that the OS is changed between Windows and Linux.

Prerequisites

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select your region and project.
  3. Under Computing, click Elastic Cloud Server.
  4. Locate the row containing the target ECS. Click More in the Operation column and select Manage Image/Disk > Change OS.

    Only stopped ECSs support OS changing. If the ECS is not stopped, stop it before proceeding with changing.

  5. Modify related ECS parameters, such as Image Type and Image, based on service requirements.

    For more details, see Creating an ECS.

  6. (Optional) Select the Encryption option to encrypt the system disk during OS change.

    To enable encryption, click Create Xrole to assign KMS access permissions to EVS. If you have rights granting permission, assign the KMS access permissions to EVS. If you do not have the permission, contact the user having the security administrator rights to assign the KMS access permissions. For more details, see Can All Users Use the Encryption Feature?

    Encryption parameters are as follows:

    • Encryption: indicates that the EVS disk has been encrypted.
    • Create Xrole: assigns KMS access permissions to EVS to obtain KMS keys. After the permissions are assigned, follow-up operations do not require assigning permissions again.
    • KMS Key Name: specifies the name of the key used by the encrypted EVS disk. You can select an existing key, or click Create KMS Key and create a new one on the KMS console. The default value is evs/default.
    • Xrole Name: EVSAccessKMS: specifies that permissions have been assigned to EVS to obtain KMS keys for encrypting or decrypting EVS disks.
    • KMS Key ID: specifies the ID of the key used by the encrypted data disk.
  7. (Optional) Select a License Type (Use license from the system or Bring your own license (BYOL)) if the changed OS running on your ECS is billed. For more details, see License Type.
    The following OSs are billed:
    • SUSE Linux Enterprise Server
    • Oracle Enterprise Linux
    • Red Hat Enterprise Linux
  8. Configure the login mode.

    If the target ECS uses key pair authentication, you can replace the original key pair.

  9. Click OK.
  10. On the Change ECS OS page, confirm the specifications, and click Submit Application.

    After the application is submitted, the ECS status changes to Changing OS. The OS changing has been completed when Changing OS disappears.

    A temporary ECS is created during the OS changing process. After the process is complete, this ECS will be automatically deleted.

Follow-up Procedure