net groupmap add ntgroup="Domain Admins" unixgroup=domadm rid=512 type=d
Question 1: if my previous /etc/group names already match the
ntgroup names, do I still need to run the above command?
Yes.
Question 2: once I have mapped these groups, where are they
stored, so I can back them up?
From a table in "Chapter 41. Managing TDB Files" of the
"Samba-HOWTO-Collection" you just quoted:
http://us1.samba.org/samba/docs/man/Samba-HOWTO-Collection/msdfs.html
«
group_mapping.tdb: Stores group mapping information. Preserve?=Yes. Not
used when using LDAP backend.
»
So, if you use LDAP, backup the LDAP database or a export it to a LDIF
file and keep the file.
If you are using tdbsam as a backend, look into /var/lib/samba (at least
in a RedHat System) and backup the "group_mapping.tdb" file.
Most of all, do your homework. Please note that you can download the
following books in PDF format and use the search function.
Samba 3 By Example
Samba 3 HOWTO
They are included with Samba.
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