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8.6.14 smbrun This option sets the location of the smbrun executable, which Samba uses as a wrapper to run shell commands. The default value for this option is automatically configured by Samba when it is compiled. If you did not install Samba to the standard directory, you can specify where the binary is as follows: [global] smbrun = /usr/local/bin/smbrun 8.6.15 status This global option indicates whether Samba should log all active connections to a status file. This file is used only by the smbstatus command. If you have no intentions of using this command, you can set this option to no, which can result in a small increase of speed on the server. The default value for this option is yes. You can override it as follows: [global] status = no 8.6.16 strict sync This share-level option determines whether Samba honors all requests to perform a disk sync when requested to do so by a client. Many clients request a disk sync when they are really just trying to flush data to their own open files. As a result, this can substantially slow a Samba server down. The default value for this option is no. You can override it as follows: [data] strict sync = yes 8.6.17 sync always This share-level option decides whether every write to disk should be followed by a disk synchronization before the write call returns control to the client. Even if the value of this option is no, clients can request a disk synchronization; see the strictsyncoption above. The default value for this option is no. You can override it per share as follows: [data] sync always = yes 8.6.18 strip dot This global option determines whether to remove the trailing dot from Unix filenames that are formatted with a dot at the end. The default value for this option is no. You can override it per share as follows: [global] strip dot = yes This option is now considered obsolete; the user should use the mangledmapoption insead. 275
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The section Section B.2.2.6, The TCP receive window in Appendix B,Samba Performance Tuning, shows some uses for this option. 8.6.9 nt pipe support This global option is used by developers to allow or disallow Windows NT clients the ability to make connections to the NT SMB-specific IPC$ pipes. As a user, you should never need to override the default: [global] nt pipe support = yes 8.6.10 nt smb support This global option is used by developers to negotiate NT-specific SMB options with Windows NT clients. The Samba team has discovered that slightly better performance comes from setting this value to no. However, as a user, you should probably not override the default: [global] nt smb support = yes 8.6.11 ole locking compatibility This global option turns off Samba s internal byte-range locking manipulation in files, which gives compatibility with Object Linking and Embedding (OLE) applications that use high byte-range locks as a method of interprocess communication. The default value for this option is yes. If you trust your Unix locking mechanisms, you can override it as follows: [global] ole locking compatibility = no 8.6.12 panic action This global option specifies a command to execute in the event that Samba itself encounters a fatal error when loading or running. There is no default value for this option. You can specify an action as follows: [global] panic action = /bin/csh -c xedit < "Samba has shutdown unexpectedly! 8.6.13 set directory This boolean share-level option allows Digital Pathworks clients to use the setdircommand to change directories on the server. If you are not using the Digital Pathworks client, you should not need to alter this option. The default value for this option is no. You can override it per share as follows: [data] set directory = yes 274
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8.6.4 keep alive This global option specifies the number of seconds that Samba waits between sending NetBIOS keep-alive packets. These packets are used to ping a client to detect whether it is still alive and on the network. The default value for this option is 0, which means that Samba will not send any such packets at all. You can override it as follows: [global] keep alive = 10 8.6.5 max disk size This global option specifies an illusory limit, in megabytes, for each of the shares that Samba is using. You would typically set this option to prevent clients with older operating systems from incorrectly processing large disk spaces, such as those over one gigabyte. The default value for this option is 0, which means there is no upper limit at all. You can override it as follows: [global] max disk size = 1000 8.6.6 max mux This global option specifies the maximum number of concurrent SMB operations that Samba allows. The default value for this option is 50. You can override it as follows: [global] max mux = 100 8.6.7 max open files This global option specifies the maximum number of open files that Samba should allow at any given time for all processes. This value must be equal to or less than the amount allowed by the operating system, which varies from system to system. The default value for this option is 10,000. You can override it as follows: [global] max open files = 8000 8.6.8 max xmit This global option sets the maximum size of packets that Samba exchanges with a client. In some cases, setting a smaller maximum packet size can increase performance, especially with Windows for Workgroups. The default value for this option is 65535. You can override it as follows: [global] max xmit = 4096 273
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This tells Samba to terminate any inactive client sessions after 10 minutes. For most networks, setting this option as such will work because reconnections from the client are generally performed transparently to the user. 8.6.2 dfree command This global option is used on systems that incorrectly determine the free space left on the disk. So far, the only confirmed system that needs this option set is Ultrix. There is no default value for this option, which means that Samba already knows how to compute the free disk space on its own and the results are considered reliable. You can override it as follows: [global] dfree command = /usr/local/bin/dfree This option should point to a script that should return the total disk space in a block, and the number of available blocks. The Samba documentation recommends the following as a usable script: #!/bin/sh df $1 | tail -1 | awk {print $2″ “$4} On System V machines, the following will work: #!/bin/sh /usr/bin/df $1 | tail -1 | awk {print $3″ “$5} 8.6.3 fstype This share-level option sets the type of filesystem that Samba reports when queried by the client. There are three strings that can be used as a value to this configuration option, as listed in Table 8.11. Table 8.11: Filesystem Types Variable Definition NTFS Microsoft Windows NT filesystem FAT DOS FAT filesystem Samba Samba filesystem The default value for this option is NTFS, which represents a Windows NT filesystem. There probably isn t a need to specify any other type of filesystem. However, if you need to, you can override it per share as follows: [data] fstype = FAT 272
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Option Parameters Function Default Scope max xmit numerical Specifies the maximum packet size that Samba will send. 65,535 Global nt pipe support boolean Turns off an experimental NT feature, for benchmarking or in case of an error. yes Global nt smb support boolean Turns off an experimental NT feature, for benchmarking or in case of an error. yes Global ole locking compatib-ility boolean Remaps out-of-range lock requests used on Windows to fit in allowable range on Unix. Turning it off causes Unix lock errors. yes Global panic action command Program to run if Samba server fails; for debugging. None Global set directory boolean If yes, allows VMS clients to issue setdircommands. no Global smbrun string (fully-qualified command) Sets the command Samba uses as a wrapper for shell commands. None Global status boolean If yes, allows Samba to monitor status for smbstatuscommand. yes Global strict sync boolean If no, ignores Windows applications requests to perform a sync-to-disk. no Global sync always boolean If yes, forces all client writes to be committed to disk before returning from the call. no Global strip dot boolean If yes, strips trailing dots from Unix filenames. no Global 8.6.1 deadtime This global option sets the number of minutes that Samba will wait for an inactive client before closing its session with the Samba server. A client is considered inactive when it has no open files and there is no data being sent from it. The default value for this option is 0, which means that Samba never closes any connections no matter how long they have been inactive. You can override it as follows: [global] deadtime = 10 271
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Using Samba Robert Eckstein, David Collier-Brown, Peter Kelly 1st Edition November 1999 1-56592-449-5, Order Number: 4495 416 pages, $34.95 Buy the hardcopy Table of Contents Chapter 8 Additional Samba Information 8.6 Miscellaneous Options Many Samba options are present to deal with operating system issues on either Unix or Windows. The options shown in Table 8.10 deal specifically with some of these known problems. We usually don t change these and we recommend the same to you. Table 8.10: Miscellaneous Options Option Parameters Function Default Scope deadtime numerical (number of minutes) Specifies the number of minutes of inactivity before a connection should be terminated. 0 Global dfree command string (command) Used to provide a command that returns disk free space in a format recognized by Samba. None Global fstype NTFS, FAT, or Samba Sets the filesystem type reported by the server to the client. NTFS Global keep alive seconds Sets the number of seconds between checks for an inoperative client. 0 (none) Global max disk size numerical (size in MB) Sets the largest disk size to return to a client, some of which have limits. Does not affect actual operations on the disk. 0 (infinity) Global max mux numerical Sets the maximum number of simultaneous SMB operations that clients may make. 50 Global max open files numerical Limits number of open files to be below Unix limits. 10,000 Global 270
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8.5.8 write cache size The write cache sizeshare option sets the size of a cache used by Samba while writing oplocked files. The files will be written in cachesize blocks, so you can tune Samba s write size to the optimum size for your filesystem or RAID disk array. The caching applies to the first 10 files opened with oplocks if set, and defaults to zero (off) initially. As with all caching schemes, data that hasn t been written will be lost if the system crashes. 8.5.9 source environment This options specifies a file of environment variables that Samba will read on startup. The variables set in this files can then be used in smb.conf files as $%name. For example, HOME=/home/sofia in the environment file could be used in a smb.conf file as “path = “$HOME” If the pathname begins with a “|” (pipe) symbol, Samba will attempt to run it and read its standard output. 8.5.10 min password length This option sets the minimum length, in characters, of a plain text password that Samba will accept when performing UNIX password changing. This is used to tell Samba about system-defined minimums, so it can return an appropriate error to the client. 8.5.11 netbios scope This sets the NetBIOS scope that Samba will operate under: Samba will not communicate with any machine with a different scope. This should not be set unless every machine on your LAN also sets this value. It was a predecessor to workgroups, and the Samba team recommends against using it. 8.4 WinPopup Messages 8.6 Miscellaneous Options O Reilly Home | O Reilly Bookstores | How to Order | O Reilly Contacts International | About O Reilly | Affiliated Companies 1999, O Reilly & Associates, Inc. 269
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[global] change notify timeout = 30 8.5.2 machine password timeout The machinepasswordtimeoutglobal option sets a retention period for NT domain machine passwords. The default is currently set to the same time period that Windows NT 4.0 uses: 604,800 seconds (one week). Samba will periodically attempt to change the machine account password, which is a password used specifically by another server to report changes to it. This option specifies the number of seconds that Samba should wait before attempting to change that password. The following example changes it to a single day, by specifying the following: [global] machine password timeout = 86400 8.5.3 stat cache The statcacheglobal option turns on caching of recent case-insensitive name mappings. The default is yes. The Samba team recommends that you never change this parameter. 8.5.4 stat cache size The statcachesizeglobal option sets the size of the cache entries to be used for the stat cacheoption. The default here is 50. Again, the Samba team recommends that you never change this parameter. === 8.5.5 utmp If you specified –with-utmp when configuring, this option will turn on utmp logging of users: they will appear in the utmp file and you will be able to see if they are on with last(1). It defaults to no. 8.5.6 utmp dir If utmpis set, the utmp dir option will change the directory Samba looks in for the utmp files. If it is not set, the default system location will be used. 8.5.7 inherit permissions This option causes new files and directories to be created with the same permissions as the directory they re in. For example, subdirectories will inherit setgid bits from their parents. This option will override the create mask, directory mask, force create modeand force directory modeoptions, but not the map archive, map hiddenand map systemoptions. It will never set the setuid bit. This option defaults to off. 268
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Table 8.9: Recently Added Options Option Parameters Function Default Scope change notify timeout numerical (number of seconds) Sets the interval between checks when a client asks to wait for a change in a specified directory. 60 Global machine password timeout numerical (number of seconds) Sets the renewal interval for NT domain machine passwords. 604,800 (1 week) Global stat cache boolean If yes, Samba will cache recent name mappings. yes Global stat cache size numerical Sets the size of the stat cache. 50 Global utmp boolean Turns on logging of Samba users in the utmp file. Requires –with-utmp. no Share utmp dir string (pathname) Sets the directory where Samba expects to find the utmp/utmpx file. None Share inherit permissions boolean Sets the permissions of newly created directories to the same as their parent. no Share write cache size numerical (bytes) Sets the size of a write cache (buffer) used for oplocked files. 0 Share source environment string (pathname) Sets a file to read environment variable from. None Global min password length numerical (number of characters) Sets the minimum length of a new password which Samba will try to update the password file with . 5 Global netbios scope string Sets the NetBIOS scope. None Global 8.5.1 change notify timeout The changenotifytimeoutglobal option emulates a Windows NT SMB feature called change notification. This allows a client to request that a Windows NT server periodically monitor a specific directory on a share for any changes. If any changes occur, the server will notify the client. As of version 2.0, Samba will perform this function for its clients. However, performing these checks too often can slow the server down considerably. This option sets the time period that Samba should wait between such checks. The default is one minute (60 seconds); however, you can use this option to specify an alternate time that Samba should wait between performing checks: 267
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Using Samba Robert Eckstein, David Collier-Brown, Peter Kelly 1st Edition November 1999 1-56592-449-5, Order Number: 4495 416 pages, $34.95 Buy the hardcopy Table of Contents Chapter 8 Additional Samba Information 8.5 Recently Added Options Samba has several options that appeared around the time of Samba 2.0, but either were not entirely supported or were in the process of being developed. With Samba 2.0.7, several more were introduced. We will give you a brief overview of their workings in this section. These options are shown in Table 8.9. 266
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