Description of problem: RHGS gluster cluster setups with ctdb absolutely need to have identical "netbios name" configurations to avoid differing account database generations on each node. When "netbios name" is not explicitly configured (our current default), the current hostname is used for "netbios name". In that case, typically each node sets its own individual value for "netbios name". The problem that then occurs is that the CTDB database entries for both standalone and domain member setups are based on that "netbios name". In case of AD members authentication will fail (or worse: multiple machine accounts are created). In case of standalone machines (not joined to AD) also each node would generate its own security identifier (SID) causing all kinds of authentication and authorization problems as there is no synchronisation between the account databases of the various nodes (e.g. duplicate entries for users can get created). All these problems are avoided when "netbios name" is set to a choosen name on all nodes in the cluster. RHGS should set a default value.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (samba bug fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:4403