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server-a RHEL 6.x with WebLogic Server 12.2.1.3.x and domains
create new server-b RHEL 7.x
copy or tar WebLogic Server 12.2.1.3.x and domains from server-a to server-b
shutdown server-a
rename server-b to server-a
startup server-a (now on RHEL 7.x)