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RedHat 9 (Linux i386) - man page for smbd (redhat section 8)

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SMBD(8) 										  SMBD(8)

       smbd - server to provide SMB/CIFS services to clients

       smbd  [	-D  ]  [ -a ]  [ -i ]  [ -o ]  [ -P ]  [ -h ]  [ -V ]  [ -d <debug level> ]  [ -l
       <log directory> ]  [ -p <port number> ]	[ -O <socket option> ]	[ -s <configuration file>

       This program is part of the Samba 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 LanMan-
       ager 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
	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)  manpage  should  be regarded as mandatory reading before proceeding with

       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.  Reload-
       ing  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

       -D     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.

       -a     If this parameter is specified, each new connection will append log messages to the
	      log file.  This is the default.

       -i     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 deamon mode when run from the command line.

       -o     If this parameter is specified, the log files will be overwritten when  opened.  By
	      default, smbd will append entries to the log files.

       -P     Passive option. Causes smbd not to send any network traffic out. Used for debugging
	      by the developers only.

       -h     Prints the help information (usage) for smbd.

       -v     Prints the version number for smbd.

       -d <debug level>
	      debuglevel is an integer from 0 to 10. The default value if this parameter  is  not
	      specified is zero.

	      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  cryp-

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

       -l <log directory>
	      If specified, log directory specifies a log directory into which the "log.smbd" log
	      file will be created for informational and debug messages from the running  server.
	      The log file generated is never removed by the server although its size may be con-
	      trolled by the max log size option in the  smb.conf(5) file. Beware: If the  direc-
	      tory  specified  does  not  exist,  smbd will log to the default debug log location
	      defined at compile time.

	      The default log directory is specified at compile time.

       -O <socket options>
	      See the socket options parameter in the smb.conf(5)
	       file for details.

       -p <port number>
	      port number is a positive integer value. The default value if this parameter is not
	      specified is 139.

	      This  number  is	the  port number that will be used when making connections to the
	      server from client software. The standard (well-known) port number for the SMB over
	      TCP  is  139,  hence the default. If you wish to run the server as an ordinary user
	      rather than as root, most systems will require you to use  a  port  number  greater
	      than 1024 - ask your system administrator for help if you are in this situation.

	      In  order for the server to be useful by most clients, should you configure it on a
	      port other than 139, you will  require  port  redirection  services  on  port  139,
	      details of which are outlined in rfc1002.txt section 4.3.5.

	      This parameter is not normally specified except in the above situation.

       -s <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 pro-
	      vide. See  smb.conf(5) for more information.  The default configuration  file  name
	      is determined at compile time.

	      If  the  server is to be run by the inetd meta-daemon, this file must contain suit-
	      able startup information for the meta-daemon. See  the  UNIX_INSTALL.html  document
	      for details.

	      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. See the UNIX_INSTALL.html document for

	      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).  See the UNIX_INSTALL.html document for details.

	      This  is the default location of the smb.conf server configuration file. Other com-
	      mon  places  that  systems  install  this  file  are  /usr/samba/lib/smb.conf   and

	      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  sec-
       ond 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
       restricions smb.conf paramater. When this is set, the following restrictions apply:

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

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

       This man page is correct for version 2.2 of the Samba suite.

       One of the common causes of difficulty when installing Samba and SWAT is the existsnece of
       some type of firewall or port filtering software on the Samba server. Make sure	that  the
       appropriate  ports  outlined in this man page are available on the server and are not cur-
       rently being blocked by some type of security software such as iptables or "port  sentry".
       For  more  troubleshooting  information, refer to the additional documentation included in
       the Samba distribution.

       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.

       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 in 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)
	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   http://samba.org/cifs/

       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 con-
       verted to YODL format (another excellent piece  of  Open  Source  software,  available  at
       ftp://ftp.icce.rug.nl/pub/unix/ <URL:ftp://ftp.icce.rug.nl/pub/unix/>) and updated for the
       Samba 2.0 release by Jeremy Allison. The conversion to DocBook for Samba 2.2 was  done  by
       Gerald Carter

					 19 November 2002				  SMBD(8)
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