smbd - server to provide SMB/CIFS services to clients


   smbd [-D|--daemon] [-F|--foreground] [-S|--log-stdout]
    [-i|--interactive] [-V] [-b|--build-options] [-d <debug level>]
    [-l|--log-basename <log directory>] [-p <port number(s)>]
    [-P <profiling level>] [-s <configuration file>] [--no-process-group]


   This program is part of the samba(7) suite.

   smbd is the server daemon that provides filesharing and printing
   services to Windows clients. The server provides filespace and printer
   services to clients using the SMB (or CIFS) protocol. This is
   compatible with the LanManager protocol, and can service LanManager
   clients. These include MSCLIENT 3.0 for DOS, Windows for Workgroups,
   Windows 95/98/ME, Windows NT, Windows 2000, OS/2, DAVE for Macintosh,
   and smbfs for Linux.

   An extensive description of the services that the server can provide is
   given in the man page for the configuration file controlling the
   attributes of those services (see smb.conf(5). This man page will not
   describe the services, but will concentrate on the administrative
   aspects of running the server.

   Please note that there are significant security implications to running
   this server, and the smb.conf(5) manual page should be regarded as
   mandatory reading before proceeding with installation.

   A session is created whenever a client requests one. Each client gets a
   copy of the server for each session. This copy then services all
   connections made by the client during that session. When all
   connections from its client are closed, the copy of the server for that
   client terminates.

   The configuration file, and any files that it includes, are
   automatically reloaded every minute, if they change. You can force a
   reload by sending a SIGHUP to the server. Reloading the configuration
   file will not affect connections to any service that is already
   established. Either the user will have to disconnect from the service,
   or smbd killed and restarted.


       If specified, this parameter causes the server to operate as a
       daemon. That is, it detaches itself and runs in the background,
       fielding requests on the appropriate port. Operating the server as
       a daemon is the recommended way of running smbd for servers that
       provide more than casual use file and print services. This switch
       is assumed if smbd is executed on the command line of a shell.

       If specified, this parameter causes the main smbd process to not
       daemonize, i.e. double-fork and disassociate with the terminal.
       Child processes are still created as normal to service each
       connection request, but the main process does not exit. This
       operation mode is suitable for running smbd under process
       supervisors such as supervise and svscan from Daniel J. Bernstein's
       daemontools package, or the AIX process monitor.

       If specified, this parameter causes smbd to log to standard output
       rather than a file.

       If this parameter is specified it causes the server to run
       "interactively", not as a daemon, even if the server is executed on
       the command line of a shell. Setting this parameter negates the
       implicit daemon mode when run from the command line.  smbd will
       only accept one connection and terminate. It will also log to
       standard output, as if the -S parameter had been given.

       level is an integer from 0 to 10. The default value if this
       parameter is not specified is 0.

       The higher this value, the more detail will be logged to the log
       files about the activities of the server. At level 0, only critical
       errors and serious warnings will be logged. Level 1 is a reasonable
       level for day-to-day running - it generates a small amount of
       information about operations carried out.

       Levels above 1 will generate considerable amounts of log data, and
       should only be used when investigating a problem. Levels above 3
       are designed for use only by developers and generate HUGE amounts
       of log data, most of which is extremely cryptic.

       Note that specifying this parameter here will override the log
       level parameter in the smb.conf file.

       Prints the program version number.

   -s|--configfile=<configuration file>
       The file specified contains the configuration details required by
       the server. The information in this file includes server-specific
       information such as what printcap file to use, as well as
       descriptions of all the services that the server is to provide. See
       smb.conf for more information. The default configuration file name
       is determined at compile time.

       Base directory name for log/debug files. The extension ".progname"
       will be appended (e.g. log.smbclient, log.smbd, etc...). The log
       file is never removed by the client.

       Set the smb.conf(5) option "<name>" to value "<value>" from the
       command line. This overrides compiled-in defaults and options read
       from the configuration file.

       Print a summary of command line options.

       Display brief usage message.

       Do not create a new process group for smbd.

       Prints information about how Samba was built.

   -p|--port<port number(s)>
       port number(s) is a space or comma-separated list of TCP ports smbd
       should listen on. The default value is taken from the ports
       parameter in smb.conf

       The default ports are 139 (used for SMB over NetBIOS over TCP) and
       port 445 (used for plain SMB over TCP).

   -P|--profiling-level<profiling level>
       profiling level is a number specifying the level of profiling data
       to be collected. 0 turns off profiling, 1 turns on counter
       profiling only, 2 turns on complete profiling, and 3 resets all
       profiling data.


       If the server is to be run by the inetd meta-daemon, this file must
       contain suitable startup information for the meta-daemon.

       or whatever initialization script your system uses).

       If running the server as a daemon at startup, this file will need
       to contain an appropriate startup sequence for the server.

       If running the server via the meta-daemon inetd, this file must
       contain a mapping of service name (e.g., netbios-ssn) to service
       port (e.g., 139) and protocol type (e.g., tcp).

       This is the default location of the smb.conf(5) server
       configuration file. Other common places that systems install this
       file are /usr/samba/lib/smb.conf and /etc/samba/smb.conf.

       This file describes all the services the server is to make
       available to clients. See smb.conf(5) for more information.


   On some systems smbd cannot change uid back to root after a setuid()
   call. Such systems are called trapdoor uid systems. If you have such a
   system, you will be unable to connect from a client (such as a PC) as
   two different users at once. Attempts to connect the second user will
   result in access denied or similar.


       If no printer name is specified to printable services, most systems
       will use the value of this variable (or lp if this variable is not
       defined) as the name of the printer to use. This is not specific to
       the server, however.


   Samba uses PAM for authentication (when presented with a plaintext
   password), for account checking (is this account disabled?) and for
   session management. The degree too which samba supports PAM is
   restricted by the limitations of the SMB protocol and the obey pam
   restrictions smb.conf(5) parameter. When this is set, the following
   restrictions apply:

   *   Account Validation: All accesses to a samba server are checked
       against PAM to see if the account is valid, not disabled and is
       permitted to login at this time. This also applies to encrypted

   *   Session Management: When not using share level security, users must
       pass PAM's session checks before access is granted. Note however,
       that this is bypassed in share level security. Note also that some
       older pam configuration files may need a line added for session


   This man page is correct for version 3 of the Samba suite.


   Most diagnostics issued by the server are logged in a specified log
   file. The log file name is specified at compile time, but may be
   overridden on the command line.

   The number and nature of diagnostics available depends on the debug
   level used by the server. If you have problems, set the debug level to
   3 and peruse the log files.

   Most messages are reasonably self-explanatory. Unfortunately, at the
   time this man page was created, there are too many diagnostics
   available in the source code to warrant describing each and every
   diagnostic. At this stage your best bet is still to grep the source
   code and inspect the conditions that gave rise to the diagnostics you
   are seeing.


   Samba stores it's data in several TDB (Trivial Database) files, usually
   located in /var/lib/samba.

   (*) information persistent across restarts (but not necessarily
   important to backup).

       NT account policy settings such as pw expiration, etc...

       byte range locks

       browse lists

       generic caching db

       group mapping information

       share modes & oplocks

       bad pw attempts

       Samba messaging system

       cache of user net_info_3 struct from net_samlogon() request (as a
       domain member)

       installed printer drivers

       installed printer forms

       installed printer information

       directory containing tdb per print queue of cached lpq output

       Windows registry skeleton (connect via regedit.exe)

       session information (e.g. support for 'utmp = yes')

       share connections (used to enforce max connections, etc...)

       open file handles (used durable handles, etc...)

       share acls

       winbindd's cache of user lists, etc...

       winbindd's local idmap db

       wins database when 'wins support = yes'


   Sending the smbd a SIGHUP will cause it to reload its smb.conf
   configuration file within a short period of time.

   To shut down a user's smbd process it is recommended that SIGKILL (-9)
   NOT be used, except as a last resort, as this may leave the shared
   memory area in an inconsistent state. The safe way to terminate an smbd
   is to send it a SIGTERM (-15) signal and wait for it to die on its own.

   The debug log level of smbd may be raised or lowered using
   smbcontrol(1) program (SIGUSR[1|2] signals are no longer used since
   Samba 2.2). This is to allow transient problems to be diagnosed, whilst
   still running at a normally low log level.

   Note that as the signal handlers send a debug write, they are not
   re-entrant in smbd. This you should wait until smbd is in a state of
   waiting for an incoming SMB before issuing them. It is possible to make
   the signal handlers safe by un-blocking the signals before the select
   call and re-blocking them after, however this would affect performance.


   hosts_access(5), inetd(8), nmbd(8), smb.conf(5), smbclient(1),
   testparm(1), and the Internet RFC's rfc1001.txt, rfc1002.txt. In
   addition the CIFS (formerly SMB) specification is available as a link
   from the Web page


   The original Samba software and related utilities were created by
   Andrew Tridgell. Samba is now developed by the Samba Team as an Open
   Source project similar to the way the Linux kernel is developed.

   The original Samba man pages were written by Karl Auer. The man page
   sources were converted to YODL format (another excellent piece of Open
   Source software, available at and
   updated for the Samba 2.0 release by Jeremy Allison. The conversion to
   DocBook for Samba 2.2 was done by Gerald Carter. The conversion to
   DocBook XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.

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