Unregistering a RHEL machine
The only thing required to unregister a machine is to run the unregister command. This removes the system’s entry from the subscription service, unsubscribes it from any subscriptions, and, locally, deletes its identity and entitlement certificates.
In the Red Hat Subscription Manager GUI, there is an Unregister button in the top right corner of the window.
From the command line, this requires only the unregister command.
Unregistering a Consumer
[root@server1 ~]# subscription-manager unregister
