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.\" Manual: System Administration tools
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.TH "SMBD" "8" "10/29/2009" "Samba 3\&.4" "System Administration tools"
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smbd \- server to provide SMB/CIFS services to clients
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\FCsmbd\F[] [\-D] [\-F] [\-S] [\-i] [\-h] [\-V] [\-b] [\-d\ <debug\ level>] [\-l\ <log\ directory>] [\-p\ <port\ number(s)>] [\-P\ <profiling\ level>] [\-O\ <socket\ option>] [\-s\ <configuration\ file>]
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This program is part of the
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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\&.
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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
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\fBsmb.conf\fR(5)\&. This man page will not describe the services, but will concentrate on the administrative aspects of running the server\&.
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Please note that there are significant security implications to running this server, and the
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manual page should be regarded as mandatory reading before proceeding with installation\&.
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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\&.
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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
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killed and restarted\&.
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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
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for servers that provide more than casual use file and print services\&. This switch is assumed if
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is executed on the command line of a shell\&.
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If specified, this parameter causes the main
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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
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under process supervisors such as
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from Daniel J\&. Bernstein\'s
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package, or the AIX process monitor\&.
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If specified, this parameter causes
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to log to standard output rather than a file\&.
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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\&.
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also logs to standard output, as if the
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parameter had been given\&.
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\-d|\-\-debuglevel=level
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is an integer from 0 to 10\&. The default value if this parameter is not specified is 0\&.
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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\&.
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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\&.
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Note that specifying this parameter here will override the
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\m[blue]\fBlog level\fR\m[]
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Prints the program version number\&.
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\-s <configuration file>
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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
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for more information\&. The default configuration file name is determined at compile time\&.
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\-l|\-\-log\-basename=logdirectory
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Base directory name for log/debug files\&. The extension
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will be appended (e\&.g\&. log\&.smbclient, log\&.smbd, etc\&.\&.\&.)\&. The log file is never removed by the client\&.
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Print a summary of command line options\&.
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Prints information about how Samba was built\&.
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\-p|\-\-port<port number(s)>
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is a space or comma\-separated list of TCP ports smbd should listen on\&. The default value is taken from the
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\m[blue]\fBports\fR\m[]
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The default ports are 139 (used for SMB over NetBIOS over TCP) and port 445 (used for plain SMB over TCP)\&.
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\-P|\-\-profiling\-level<profiling level>
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\fIprofiling level\fR
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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\&.
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\FC/etc/inetd\&.conf\F[]
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If the server is to be run by the
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meta\-daemon, this file must contain suitable startup information for the meta\-daemon\&.
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or whatever initialization script your system uses)\&.
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If running the server as a daemon at startup, this file will need to contain an appropriate startup sequence for the server\&.
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If running the server via the meta\-daemon
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\FCinetd\F[], 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)\&.
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\FC/etc/samba/smb\&.conf\F[]
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This is the default location of the
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server configuration file\&.
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This file describes all the services the server is to make available to clients\&. See
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for more information\&.
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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\&.
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.SH "ENVIRONMENT VARIABLES"
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If no printer name is specified to printable services, most systems will use the value of this variable (or
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if this variable is not defined) as the name of the printer to use\&. This is not specific to the server, however\&.
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.SH "PAM INTERACTION"
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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
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\m[blue]\fBobey pam restrictions\fR\m[]
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paramater\&. When this is set, the following restrictions apply:
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\fIAccount Validation\fR: All accesses 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\&.
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\fISession Management\fR: 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\&.
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This man page is correct for version 3 of the Samba suite\&.
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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\&.
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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\&.
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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\&.
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Samba stores it\'s data in several TDB (Trivial Database) files, usually located in
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\FC/var/lib/samba\F[]\&.
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(*) information persistent across restarts (but not necessarily important to backup)\&.
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account_policy\&.tdb*
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NT account policy settings such as pw expiration, etc\&.\&.\&.
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share connections (used to enforce max connections, etc\&.\&.\&.)
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group mapping information
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share modes & oplocks
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Samba messaging system
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netsamlogon_cache\&.tdb*
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cache of user net_info_3 struct from net_samlogon() request (as a domain member)
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installed printer drivers
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installed printer forms
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installed printer information
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directory containing tdb per print queue of cached lpq output
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Windows registry skeleton (connect via regedit\&.exe)
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session information (e\&.g\&. support for \'utmp = yes\')
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winbindd\'s cache of user lists, etc\&.\&.\&.
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winbindd_idmap\&.tdb*
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winbindd\'s local idmap db
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wins database when \'wins support = yes\'
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a SIGHUP will cause it to reload its
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configuration file within a short period of time\&.
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To shut down a user\'s
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process it is recommended that
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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
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is to send it a SIGTERM (\-15) signal and wait for it to die on its own\&.
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The debug log level of
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may be raised or lowered using
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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\&.
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Note that as the signal handlers send a debug write, they are not re\-entrant in
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\FCsmbd\F[]\&. This you should wait until
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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\&.
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\fBhosts_access\fR(5),
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\fBtestprns\fR(1), and the Internet RFC\'s
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\FCrfc1001\&.txt\F[],
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\FCrfc1002\&.txt\F[]\&. In addition the CIFS (formerly SMB) specification is available as a link from the Web page
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http://samba\&.org/cifs/\&.
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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\&.
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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
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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\&. The conversion to DocBook XML 4\&.2 for Samba 3\&.0 was done by Alexander Bokovoy\&.
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