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I presume they are using docker swarm in this instance.

You just run scp with the compose file and run docker compose down; docker compose up

Bonus points if you just mount the compose file on an NFS share.

I've wasted enough man months on kubernetes that unless you tell me to manage 1000 nodes this approach will never cost me more time than the time I spent using and learning kubernetes.

A lot of people use it for deployment standard and don't care about multinode.