Has any samba file been broken or do not have the indicated permissions ?. I have no experience with redhat linux, an option would be to save your configuration files:

and reinstall samba package.

Has any samba file been broken or do not have the indicated permissions ?. I have no experience with redhat linux, a suggestion would be to save your configuration files:

and reinstall samba package.

It was my first attempt, I deleted the folders.
After:
yum remove samba
yum remove samba-common

yum install samba
yum install samba-common (folders / files were only recreated when installing this).

even so, the service does not start.

What RedHat version? Do you have active subscription?
Is the system updated with latest patches?

The problem is, that CTDB uses old service handling. This seems not to be updated across the RedHat/CentOS/Fedora.
50.samba script uses "service samba start" or "service samba stop" but it should use now: "systemctl start smb.service" or "systemctl stop smb.service".
I'm now debugging it, however this is probably the reason why 'ctdb event script enable legacy 50.samba' does not work.
Also, the CTDB manual pages on samba.org are outdated and the most recent changes you can see only in the version changelog.

Actually that was it. After changing that line:

service_name="samba"

to:

service_name="smb"

in /usr/share/ctdb/events/legacy/50.samba.script

and restart of CTDB:

systemctl stop ctdb; sleep 1; systemctl start ctdb

all works as expected:

[root@fs01 log]# ctdb scriptstatus
00.ctdb OK 0.004 Mon Nov 14 17:01:24 2022
01.reclock OK 0.004 Mon Nov 14 17:01:24 2022
05.system OK 0.019 Mon Nov 14 17:01:24 2022
10.interface OK 0.034 Mon Nov 14 17:01:24 2022
50.samba OK 0.118 Mon Nov 14 17:01:24 2022
[root@fs01 log]# ps auxw | grep samba
root 1075309 0.0 0.0 221664 2316 pts/0 S+ 17:01 0:00 grep --color=auto samba
[root@fs01 log]# ps auxw | grep smb
root 1075053 0.1 0.0 360212 25844 ? Ss 17:01 0:00 /usr/sbin/smbd --foreground --no-process-group
root 1075055 0.0 0.0 341112 10552 ? S 17:01 0:00 /usr/sbin/smbd --foreground --no-process-group
root 1075056 0.0 0.0 341104 4324 ? S 17:01 0:00 /usr/sbin/smbd --foreground --no-process-group
root 1075371 0.0 0.0 221664 2320 pts/0 S+ 17:01 0:00 grep --color=auto smb

The Samba/CTDB team should simply update their documentation/scripts.