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Create and manage image

An image is a template that includes an operating system, applications, and configuration settings required to run a virtual machine.
Depending on your use case, you can start an instance using an image that includes the necessary OS and applications.

View image list​

You can view the list of images currently in use and check information for each image.

  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.

  2. In the Image menu, check the list of currently used images.

    Image list View image list

    TypeDescription
    DefaultImages officially provided by KakaoCloud
    My imagesImages created by the user
    - You can edit or delete the image name and description
info

Windows-based images provided as default images do not apply to free credits. Please take note when using them.

Create my image​

You can create an image from the current state of an instance. Created images can later be used to launch new instances.

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Only the root volume with an operating system installed can be used to create an image. To back up additional volumes, use the snapshot feature.

  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.

  2. In the Instance menu, click the [More] icon for the desired instance and select Create image.

  3. In the Create image popup, enter the required information and click [Create].

    Create image Create image

Create instance with my image​

You can create an instance using information stored in a custom image.

  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.

  2. In the Image menu, select the My images tab.

  3. Click Create instance for the desired image.

    • The selected image will be prefilled in the Create instance screen.
    • You can switch to a different image under the My images tab.

    My image list

  4. Enter the necessary information and click [Create].

Modify my image​

You can update information for your custom image.

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If the image was shared from another project, only the creator can modify it.

  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.
  2. In the Image menu, select the My images tab.
  3. Click the [More] icon for the image to update and select Edit image.
  4. In the Edit image popup, edit the information and click [Save].

Share my image​

You can share custom images with other projects within your account.

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  • Only the creator of an image can share or unshare it.
  • Members of projects that received the shared image will see a [Shared] icon next to the image.

  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.

  2. In the Image menu, select the My images tab.

  3. Click the [More] icon for the image to share and select Share image.

  4. In the Share image popup, select the target project and click [Share].

    Share image Share image

Delete my image​

You can delete images that are no longer needed.

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  • You can only delete images you created.
  • If the image was shared from another project, only the creator can delete it.
  1. Go to the KakaoCloud Console > Beyond Compute Service > Virtual Machine menu.
  2. In the Image menu, select the My images tab.
  3. Click the [More] icon for the image to delete and select Delete image.
  4. In the Delete image popup, enter the image name and click [Delete].

Change root volume partition table format​

Some OS-based instances use the MBR (Master Boot Record) partition table scheme for the root volume by default. MBR supports up to 4 partitions and disks up to 2.0 TB. GPT (GUID Partition Table), on the other hand, has no such limitations.

KakaoCloud provides cloud images without modification to OS-level settings. Instances based on CentOS, CentOS Stream, or Rocky Linux may use MBR for the root volume, but you can convert them to GPT.

The partition table format and file system type for each OS image are as follows:

OS nameVersionRoot volume partition table
Ubuntu20.04GPT
Ubuntu22.04GPT
Ubuntu24.04GPT
CentOS Stream9MBR
Rocky Linux8.10MBR
Rocky Linux9.4MBR
Alma Linux8.10GPT
Alma Linux9.4GPT
Windows2019MBR
Windows2022MBR

Procedure​

Here's how to convert the disk partition table format from MBR to GPT for a CentOS instance.
This example uses the CentOS Stream 8 image provided by KakaoCloud.

caution

Changing the partition table of a disk in use may cause data loss. Always back up before proceeding.

  1. Check current disk info with lsblk:

    Klsblk 명령
    [root@centos ~]$ sudo fdisk -l

    Disk /dev/vda: 10.7 GB, 10737418240 bytes, 20971520 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x0009b542

    Device Boot      Start         End      Blocks   Id  System
    /dev/vda1   *        2048    20971486    10484719+  83  Linux

  2. Check the current partition table using gdisk:

    gdisk 명령
       [root@centos ~]$ sudo gdisk -l /dev/vda
       GPT fdisk (gdisk) version 0.8.10

       Partition table scan:
       MBR: MBR only
       BSD: not present
       APM: not present
       GPT: not present

       ***************************************************************
       Found invalid GPT and valid MBR; converting MBR to GPT format
       in memory.
       ***************************************************************

       Disk /dev/vda: 20971520 sectors, 10.0 GiB
       Logical sector size: 512 bytes
       Disk identifier (GUID): 79C4C601-BF62-45E4-97F8-AB21F158EED7
       Partition table holds up to 128 entries
       First usable sector is 34, last usable sector is 20971486
       Partitions will be aligned on 2048-sector boundaries
       Total free space is 2014 sectors (1007.0 KiB)

       Number  Start (sector)    End (sector)  Size       Code  Name
         1            2048        20971486   10.0 GiB    8300  Linux filesystem

  3. Use gdisk to convert the disk from MBR to GPT.

    • GPT requires a boot partition.
    • Create a boot partition from sector 34 to 2047 with code ef02.

  4. Install GRUB on the new boot partition:

    Install GRUB
    [root@centos ~]$ sudo partprobe
    [root@centos ~]$ sudo grub2-install /dev/vda
    Installing for i386-pc platform.
    Installation finished. No error reported.

  5. Reboot to apply changes:

    Reboot command
    [root@centos ~]$ sudo reboot

  6. Confirm the change using fdisk -l:

    Check conversion
    [root@centos ~]$ sudo fdisk -l
    WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
    Disk /dev/vda: 3221.2 GB, 3221225472000 bytes, 6291456000 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: gpt
    Disk identifier: D9C42684-E18C-4B8F-9388-C2F2CDC093ED
    #         Start          End    Size  Type            Name
    1         2048   6291455965      3T  Linux filesyste Linux filesystem
    2           34         2047   1007K  BIOS boot       BIOS boot partition