Migrate Rancher host from server to server
First of all you need to support HA mode. You will need:


external MySQL DB (e.g. AWS RDS Aurora)
external load balancer (e.g. AWS ELB)
2 additional Rancher Server Nodes (to support quorum of 3)


Once you will be ready with external DB Rancher would ask you to backup &amp; restore his database in it. After that you'll be asked to redeploy Rancher Server with additional params for external DB connection. Then you'll be able to run two more Rancher Server Nodes (e.g. using AWS ELB).

When previous steps have finished you would be able to add more Rancher Agent Nodes in AWS directly from Rancher Hosts tab. After that you can just switch off OVH nodes - payload would be transferred to AWS automagically.

Make sure to backup &amp; restore all databases or data-sensitive instances on OVH hosts.

More information such as HA Requirements etc. can be found in documentation.