This topic describes how to use a custom image to create an ECS instance. You can use a custom image to create an ECS instance that has the same operating system, applications, and data as those of the custom image to improve efficiency.

Prerequisites

A custom image is created under the account and region where you want to create an instance.

Background information

If you do not have a custom image in the account and region where you want to create an instance, you can use one of the following solutions.
Scenario Solution
You have an image on the local device. Import the local image to Alibaba Cloud as a custom image. For more information, see Image import procedure.
You do not have custom images but have an instance as a template. Create a custom image by using an instance.
You do not have custom images but have a snapshot as a template. Create a custom image from a snapshot.
You have a custom image in another region. Copy the custom image to the region where you want to create an instance. For more information, see Copy custom images.
You have a custom image in another account. Share the custom image to the account under which you want to create an instance. For more information, see Share or unshare custom images.

Procedure

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Images.
  3. In the top navigation bar, select a region.
  4. Based on the image source, use one of the following methods to go to the Images page:
    • Custom image created or exported: Go to the Custom Images tab.
    • Custom image obtained by copying: Go to the Custom Images tab.
    • Custom image obtained by sharing: Go to the Shared Images tab.
  5. Find the image that you want to use. Click Create Instance in the Actions column.
  6. Configure the parameters and create the instance.
    Information of the region and image sections is automatically filled. Configure other parameters based on your needs. For more information, see Create an instance by using the provided wizard.
    Note If the selected custom image contains one or more data disk snapshots, an equal number of data disks are automatically created from these snapshots. Each disk has the same size as the snapshot from which the disk is created. You can increase the size of a data disk but cannot decrease it.