This guide explains how to transfer an instance to another physical machine within Infomaniak's Public Cloud.

Introduction

• This operation can be performed at any time and offers several advantages:
  • anticipate or avoid planned maintenance;
  • distribute the load across multiple hosts;
  • improve the stability or performance of an instance.

Migrate the instance to another physical machine…

… since Horizon

1. Click here to access the management of your product in the Infomaniak Manager (need help?).
2. Click directly on the name assigned to the product in question:
   
3. Click on the Horizon shortcut to connect to it:
   
4. In the Instances menu, click on the action menu ⋮ located to the right of the instance to be transferred.
5. Click on Transfer an instance (Migrate):
   
6. Confirm the transfer:
   
7. Check the current status and wait a few minutes:
   
8. Confirm the migration:
   
9. Wait for the operation to complete before restarting or modifying the instance.

… via the command line (CLI)

1. List your available instances:
   openstack server list
2. Identify the ID of the instance to be transferred (ID column).
3. Start the migration to another physical host:
   openstack server migrate <instance_ID>
   This command triggers the movement of the instance to a new host within the cluster.
4. Check the migration status:
   openstack server show <instance_ID>
   The instance will then enter the RESIZED state when the migration is complete but not yet confirmed.
5. Once the migration is complete and validated, confirm the transfer:
   openstack server resize --confirm <instance_ID>
   or, depending on the OpenStack client version:
   openstack server migration confirm <instance_ID>
   
   • If the server migration confirm command displays a warning indicating that it is deprecated, the process will still run in the background and the confirmation will be taken into account.
   • If you get an error like:
     Cannot 'confirmResize' instance ... while it is in vm_state active (HTTP 409)
     this means that the migration has already been confirmed (manually or automatically).
6. You can also cancel the migration if a problem is detected before confirmation:
   openstack server resize --revert <instance_ID>
   or:
   openstack server migration revert <instance_ID>
7. If no manual action is performed, the migration is automatically confirmed after 24 hours. The instance status then reverts to ACTIVE.