You can create a custom image from a snapshot that contains the operating system and data of an Elastic Compute Service (ECS) instance. Then, you can use the custom image to create identical ECS instances. This topic describes how to use a system disk snapshot to create a custom image.
Prerequisites
The snapshot service is activated, and a system disk snapshot is created. For more information, see Activate ECS Snapshot and Create a snapshot for a disk.
Sensitive data is deleted from the system disk snapshot to enhance data security.
Considerations
Before you create custom images from snapshots, take note of the items described in the following table.
Consideration | Description |
Region | A custom image resides in the same region as the snapshot from which the image was created. For information about how to use images across regions, see Copy a custom image. |
Billing | You are charged for snapshots. For information about the billing of snapshots, see Snapshots. |
Snapshot |
|
ECS instance | For ECS instances that are created from custom images, take note of the following items:
|
Procedure
This section describes how to create a custom image from a system disk snapshot on the Snapshots page in the ECS console. You can also go to the Images page (
) or go to the Snapshot tab of the Instance Details page from the Instance page ( ) to create a custom image from a system disk snapshot.Log on to the ECS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the region and resource group to which the resource belongs.
On the Disk Snapshots tab, find a snapshot whose Disk Type is System Disk and click Create Custom Image in the Actions column.
In the Create Custom Image dialog box, configure the parameters that are described in the following table.
Parameter
Description
References
Image Name
Enter a name for the custom image.
N/A
Image Check
Optional. The image check feature checks whether imported custom images are valid and whether the images can be used to create full-featured ECS instances.
By default, Check After Creation is selected, and the image check feature checks the custom image immediately after the image is created. After the image is checked, you view the check results in the Check Results column corresponding to the image on the Custom Images tab and resolve issues by using the repair feature of Image Builder or based on the solutions that are provided in the check results. For information about check items and solutions to image issues, see Overview.
NoteOnly specific operating systems support the image check feature. For information about the operating systems that do not support the image check feature, see Operating system limits for image check.
Image Family
Optional. Select an image family.
Custom images that belong to an image family can be deprecated or restored to allow seamless image updates and rollbacks.
Snapshot Details
Optional. Select increaseData Disk, click increases, and then select the ID of a data disk snapshot.
If you leave the Snapshot ID field empty, an empty data disk will be created when you use the custom image to create an ECS instance. By default, the data disk is 5 GiB in size.
If you select the ID of a data disk snapshot, a data disk is created from the data disk snapshot and has the same size as the snapshot when you use the custom image to create an ECS instance.
Image Description
Optional. Enter a description for the custom image.
N/A
Tag
Select a tag.
The Tag parameter is optional in most cases.
The Tag parameter is required when you log on as a Resource Access Management (RAM) user and a policy attached to the RAM user requires that tags be added. In this case, if you do not specify the Tag parameter, an error is reported indicating insufficient permissions.
Resource Group
Optional. Select a resource group to manage the custom image based on the usage and permissions.
Automatic release time has been set for the selected snapshot. To ensure that the snapshot can be automatically released, you must delete the associated image before the snapshot expires. Otherwise, the snapshot cannot be released and will continue to incur charges.
If a retention period is configured for the selected snapshot, select this option.
In the message that appears, click OK.