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man smb.conf 写了： passdb backend (G)

This option allows the administrator to chose which backend will be
used for storing user and possibly group information. This allows you
to swap between different storage mechanisms without recompile.

The parameter value is divided into two parts, the backend's name, and
a 'location' string that has meaning only to that particular backed.
These are separated by a : character.

Available backends can include:

· smbpasswd - The old plaintext passdb backend. Some Samba features
will not work if this passdb backend is used. Takes a path to the
smbpasswd file as an optional argument.

· tdbsam - The TDB based password storage backend. Takes a path to
the TDB as an optional argument (defaults to passdb.tdb in the
private dir directory.

· ldapsam - The LDAP based passdb backend. Takes an LDAP URL as an
optional argument (defaults to ldap://localhost)

LDAP connections should be secured where possible. This may be done
using either Start-TLS (see ldap ssl) or by specifying ldaps:// in
the URL argument.

Multiple servers may also be specified in double-quotes. Whether
multiple servers are supported or not and the exact syntax depends
on the LDAP library you use.