Hi @ster migrating the clients is supported by setting up multiple servers in your mender.conf file. See https://docs.mender.io/2.1/client-configuration/configuration-file/configuration-options#servers for specifics. Basically, you have to do a bootstrap update where you include both the old and the new server in an image. Let the deployment complete. Then the client will attempt to authenticate with the new server and finish the deployment on the old server. Once it is admitted on the new server you can then deploy another update to remove the old server from the mender.conf file.
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