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Server Migration Center

Best Practices

Manually releasing temporary resources

Migration may fail due to causes such as network issues, changes to the source server, or other failures. In this case, SMC does not automatically release the temporary cloud resources it creates for data migration (for example, EIPs, security groups, and volumes). You need to manually release these resources to prevent incurring unnecessary charges.

tip

Manual release of temporary resources is required only when migration fails during the process of migrating to ECS instances or custom images.

Procedure

Migration failure to ECS instance

In the left directory tree, select "Server Migration Center > Migration Job".

Select the "Migrate to server" tab.

Click the "Logs" button in the Actions column on the right side of the target migration task.

Resource description:

Parameter	Description	Sample value
Temporary SecurityGroup	Temporary security group ID.	sg-miqmwast7xxxxx4ye
Instance	ID of the destination instance for migration.	i-ycswsqhurk5xxxxxzda
KeyPair	Temporary key pair ID.	kp-ycswszszxxxxxj2a
Transition Data Volume	Temporary data volume ID.	vol-99t2xxxxxcpc

Manually release the corresponding resources based on the resource IDs displayed in the log information.

tip

Additionally, you can check the Agent logs located in the migration Agent directory on your source server.

Linux operating system: Execute the cat smc.log command.

Windows operating system: View the smc.txt file.

Release temporary key pair

In the top menu bar, select the region where the target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of KeyPair in the log information to search for the target key pair.

Click the "Unbind instances" button in the Actions column to the right of the target key pair, and in the pop-up window, check the instance corresponding to the Instance parameter.

Click the "Confirm" button to complete disassociation.

Click the "Delete" button in the Actions column to the right of the target key pair, and confirm the key pair information in the pop-up window.

Click the "Delete" button to complete deletion.

Release temporary security group

In the top menu bar, select the region where the target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of Temporary SecurityGroup in the log information to search for the target security group.

Click the "Associate ENI" button in the Actions column to the right of the target security group. On the "Associate ENI" tab, select the network interface associated with the instance corresponding to the Instance parameter.

Click the "Disassociate" button in the Actions column to the right of the target network interface, confirm the network interface information in the pop-up window, and click the "Disassociate" button to complete the disassociation.

Switch back to the security group list page, click the "... > Delete" button in the Actions column to the right of the target security group, and confirm the security group information in the pop-up window.

Click the "Delete" button to complete deletion.

Release temporary data volume

In the top menu bar, select the region where the target instance resides.

In the search box at the top right, select "Volume ID" from the dropdown, and enter the value of Transition Data Volume in the log information to search for the target volume.

Click the "... > Detach" button in the Actions column to the right of the target volume, and confirm the volume and target instance information in the pop-up window.

Click the "Confirm" button to complete detachment.

After detachment is complete, click the "... > Delete" button in the Actions column to the right of the target volume, and confirm the volume information in the pop-up window.

Click the "Confirm" button to complete the operation.

Reset target instance login credentials

Since SMC replaces the login credentials of the target instance with a temporary key pair during migration, if migration fails, you need to reset the login credentials of the target instance to avoid login failure to the target instance. For operation details, see Resetting login password.

Afterwards, you can use SMC to migrate source server data to the VolcanoEngine. For details, see Getting started.

Migration failure to custom image

In the left directory tree, select "Server Migration Center > Migration Job".

Select the "Migrate to server" tab.

Click the "Logs" button in the Actions column on the right side of the target migration task.

Resource description:

Parameter	Description	Sample value
Temporary Vpc	Temporary VPC ID.	vpc-rr28b0ltcv0x5xxxxxar
Temporary Subnet	Temporary subnet ID.	subnet-miz1h8r1egw5smxxxxxijz
Temporary SecurityGroup	Temporary security group ID.	sg-13felynf2xxxxxhm08y
KeyPair	Temporary key pair ID.	kp-ycsx7ibxxxxxv1mr
Temporary Instance	Temporary instance ID.	i-ycsx7icttxxxxxume
Transition Data Volume	Temporary data volume ID.	vol-99t3i6xxxxx6g781c
Temporary Eip	Temporary EIP ID.	eip-miz2fdza9lxxxxxmwr

Manually release the corresponding resources based on the resource IDs displayed in the log information.

tip

Additionally, you can check the Agent logs located in the migration Agent directory on your source server.

Linux operating system: Execute the cat smc.log command.

Windows operating system: View the smc.txt file.

Release temporary instance

You can release the temporary instance and the temporary system volume, data volume, and temporary EIP associated with it in a single operation.

In the top menu bar, select the region where the target instance resides.

In the top search box, select "Instances ID" from the dropdown, and enter the value of Temporary Instance in the log information to search for the target instance.

Click the "... > Delete" button in the Actions column on the right side of the target instance.

In the pop-up window, check the temporary data volume, temporary EIP, and "I am aware of the Instances and related resources that are about to be deleted and understand the associated risks."

Click "Delete" to complete the action.

Release temporary key pair

In the top menu bar, select the region where the target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of KeyPair in the log information to search for the target key pair.

Click the "Unbind instances" button in the Actions column to the right of the target key pair, and in the pop-up window, check the instance corresponding to the Instance parameter.

Click the "Confirm" button to complete disassociation.

Click the "Delete" button in the Actions column to the right of the target key pair, and confirm the key pair information in the pop-up window.

Click the "Delete" button to complete deletion.

Release temporary security group

In the top menu bar, select the region where the target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of Temporary SecurityGroup in the log information to search for the target security group.

Click the "Associate ENI" button in the Actions column to the right of the target security group. On the "Associate ENI" tab, select the network interface associated with the instance corresponding to the Instance parameter.

Click the "Disassociate" button in the Actions column to the right of the target network interface, confirm the network interface information in the pop-up window, and click the "Disassociate" button to complete the disassociation.

Switch back to the security group list page, click the "... > Delete" button in the Actions column to the right of the target security group, and confirm the security group information in the pop-up window.

Click the "Delete" button to complete deletion.

Release temporary subnet

In the top menu bar, select the region where the migration target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of Temporary Subnet in the log information to search for the target subnet.

Click the "Delete" button in the Actions column to the right of the target subnet, and confirm the subnet information in the pop-up window.

Click the "Delete" button to complete deletion.

Release temporary VPC

In the top menu bar, select the region where the migration target instance resides.

In the search box at the top right, select "ID" from the dropdown, and enter the value of Temporary Vpc in the log information to search for the target subnet.

Click the "Delete" button in the Actions column to the right of the target VPC, and confirm the VPC information in the pop-up window.

Click the "Delete" button to complete deletion.

Afterwards, you can use SMC to migrate source server data to the VolcanoEngine. For details, see Getting started.

Last updated: 2026.01.07 15:11:32