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 multiple identical instances. This topic describes how to use a system disk snapshot to create a custom image.
Before you create custom images from snapshots, take note of the items described in the following table.
A custom image resides within 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.
You are charged for snapshots. For information about the billing of snapshots, see Snapshots.
ECS instances created from custom images:
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 the Snapshot tab of the Instance Details 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 described in the following table.
Enter a name for the custom image.
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 can find the image in the custom image list and click Details in the Status column to view the check results and resolve issues based on the solutions that are provided in the results. For information about check items and solutions to image issues, see Overview.Note
Only 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.
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.
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 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 instance.
Optional. Enter a description for the custom image.
Select one or more tags.
The Tag parameter is optional in most cases.
Tag is a required parameter 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 that indicates insufficient permissions is reported.
Optional. Select a resource group to manage the custom image based on 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.