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Elastic Compute Service

Manage ECS instances

Migrating ECS instances from DDHs to shared hosts

If your business no longer requires dedicated resources or a higher level of isolation, you can migrate the ECS instances on your DDH to a shared host to reduce deployment costs.

Usage notes

When you migrate ECS instances from different DDHs to shared hosts, the available target instance types may vary. See the table below for details. For detailed specification information, refer to:

Instances on shared hosts: Instance types

DDH types and ECS instances on DDHs: DDH specifications

ECS instances on DDHs	Supported ECS instance types on the target shared hosts
ecs.ddhr2s ecs.ddhg2s ecs.ddhg3i	General-purpose g3i, g1ie Compute-optimized c3i, c1ie Memory-optimized r3i, r1ie Shared s2
ecs.ddhg3a	General-purpose g3a Compute-optimized c3a Memory-optimized r3a
ecs.ddhi3s	ECS instances on a Local SSD DDH cannot be migrated to a shared host.

Prerequisites

The target host must belong to the same account, region, and availability zone as the ECS instance to be migrated.

The ECS instances to be migrated on DDHs must be in the Stopped status. Stop the instances first.

Billing rules

After migrating ECS instances from DDHs to shared hosts, you need to pay separately for compute resources (vCPU and memory). The compute resource fee is not included in the DDH fee. Make sure that your account balance is sufficient. For more information, refer to Pay-as-you-go.

Procedure

In the top menu bar, select the region where your business is located.

On the DDH list page, click the target host to go to the host details page, and then select the "Associated instances" tab.

In the "Actions" column of the target instance, click "Change host deployment".

In the pop-up dialog box, configure the parameters described in the following table.

Configuration item	Description
Target type	Select "Shared host".
Target instance type	Select the target instance type from the drop-down list. For supported target instances, see Usage notes.
Agreement	Please refer to the console guidance to review and confirm the Legal.

Click "Confirm" to complete the operation.

Subsequent operations

After the migration is complete, the corresponding instance will no longer appear on the "Associated instances" tab of the DDH. You can view the migrated instance on the ECS instance list page.