Is there a easy way to move a allocation to a different client without draining this client and keep all other allocations running ?
There is not a direct way to ask an allocation to move, however, you could try stopping the allocation using the nomad alloc stop command. This does not guarantee the new allocation will not be placed on the same client though. You could optionally toggle the nodes eligibility before and after stopping the allocation to try and ensure it is placed on a different client.
jrasell and the Nomad team
it worked like a charm