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Changing hostname in Devstack two nodes setup

Hi everyone!

I am running Ubuntu 16.04 on my laptop. Actually I am trying to change my hostname from "X" and "Y" , after changing it both in /etc/hosts and /etc/hostname and rebooting, I get all the services are down and I still see few service running on old host "X". What's the secure way of changing and moving all services on new "Hostname" . I searched a lot but nothing works

In my setup , I have Devstack controller unit running in Virtualbox and ComputeNode running on Raspberry pi.

Really apreciate your support.

Regards, Ali