Christoph: /* External links */

2007-04-03T01:45:58Z

‎External links

Christoph at 01:40, 3 April 2007

2007-04-03T01:40:16Z

New page

{{lowercase|fstab}}
The '''fstab''' (for ''[[file system]]s table'') file is part of the system configuration. The fstab file typically lists all used disks and disk partitions, and indicates how they are to be used or otherwise integrated into the overall system's file system.

==Syntax==
[Device] [Mount Point] [File_system] [Options] [dump] [fsck order]

==Listing devices==
To list your devices, first connect your USB device (it does not need to be mounted).
*By volume label:
ls /dev/disk/by-label -lah
*By id:
ls /dev/disk/by-id -lah
*By uuid:
ls /dev/disk/by-uuid -lah

==Example==
The following is an example of a fstab file on a Red Hat [[Linux]] system:

<pre><nowiki>
# device name mount point fs-type options dump-freq pass-num
LABEL=/ / ext3 defaults 1 1
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0

# my removable media
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0

# my NTFS Windows XP partition
/dev/hda1 /mnt/WinXP ntfs ro,defaults 0 0

/dev/hda6 swap swap defaults 0 0

# my files partition shared by windows and linux
/dev/hda7 /mnt/shared vfat umask=000 0 0
</nowiki></pre>

(kudzu is an option specific to Red Hat and Fedora Core)

#The first column indicates the device name or other means of locating the partition or data source.
#The second column indicates where the data is to be attached to the filesystem.
#The third column indicates the filesystem type, or algorithm to use to interpret the filesystem.
#The fourth column gives options, including if the filesystem should be [[Mount (computing)|mount]]ed at boot.
#The fifth column adjusts the archiving schedule for the partition (used by dump).
#The sixth column indicates the order in which the [[fsck]] utility will scan the partitions for errors when the computer powers on.

A value of zero in either of the last 2 columns disables the corresponding feature (http://www.humbug.org.au/talks/fstab/fstab_structure.html).

To get more information about the fstab file you can read the man page about it.

The [[Kfstab]] graphical configuration utility is available for [[KDE]] for editing fstab.

==Options common to all filesystems==
As the filesystems in /etc/fstab will eventually be mounted using mount(8) it isn't surprising that the options field simply contains a comma-separated list of options which will be passed directly to mount when it tries to mount the filesystem.

The options common to all filesystems are:
;sync / async : All I/O to the file system should be done (a)synchronously.
;auto : The filesystem can be mounted automatically (at bootup, or when mount is passed the -a option). This is really unnecessary as this is the default action of mount -a anyway.
;noauto : The filesystem will NOT be automatically mounted at startup, or when mount passed -a. You must explicitly mount the filesystem.

;exec / noexec : Permit/Prevent the execution of binaries from the filesystem.
;suid / nosuid : Permit/Block the operation of [[suid]], and [[setgid|sgid]] bits.
;ro : Mount read-only.
;rw : Mount read-write.
;user : Permit any user to mount the filesystem. This automatically implies noexec, nosuid,nodev unless overridden.
;nouser : Only permit root to mount the filesystem. This is also a default setting.
;defaults : Use default settings. Equivalent to rw,suid,dev,exec,auto,nouser,async.

There are numerous options for the specific filesystems supported by mount.
However these are some of the more useful, for the full list check out the man page for `mount`.

==ext2==
;check={none, normal, strict} : Sets the fsck checking level.
;debug : print debugging info on each remount.
;sb=n : n is the block which should be used as the superblock for the fs.

==fat==
;check={r[elaxed], n[ormal], s[trict]} : Not the same as ext2, but rather deals with allowed filenames. See mount(8).
;conv={b[inary], t[ext], a[uto]} : Performs DOS<->UNIX text file conversions automatically. See mount(8).
;uid=n, gid=n : Set the user identifier, [[User identifier (Unix)|uid]], and group identifier, [[Group identifier (Unix)|gid]], for all files on the filesystem.

==iso9660==
;norock : Disables Rock Ridge extensions.

==Reloading fstab==
This command will reload fstab without a restart of the system:
mount -a

==See also==
*[[mtab]]
*[[mount]]
*[[udev]]

==External links==
*[http://www.openbsd.org/cgi-bin/man.cgi?query=fstab&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html fstab man page] via OpenBSD
*[http://netbsd.gw.com/cgi-bin/man-cgi?fstab++NetBSD-current fstab man page] by NetBSD
*[http://www.freebsd.org/cgi/man.cgi?query=fstab&apropos=0&sektion=0&manpath=FreeBSD+5.4-RELEASE+and+Ports&format=html fstab man page] via FreeBSD
*[http://man.he.net/?topic=fstab&section=all fstab man page] from [[Linux]]
*[http://www.tuxfiles.org/linuxhelp/fstab.html How to edit and understand /etc/fstab]
*[http://kfstab.sourceforge.net/ Kfstab]
*[http://www.ubuntuforums.org/showthread.php?t=283131 Understanding fstab]
*[http://wiki.linuxquestions.org/wiki/Fstab LinuxQuestions.org > Linux Wiki > Fstab]

[[Category:Linux Command Line Tools]]

@@ Line 102: / Line 102: @@
 *[http://www.ubuntuforums.org/showthread.php?t=283131 Understanding fstab]
 *[http://wiki.linuxquestions.org/wiki/Fstab LinuxQuestions.org > Linux Wiki > Fstab]
 [[Category:Linux Command Line Tools]]

Fstab - Revision history

Christoph: /* External links */

Christoph at 01:40, 3 April 2007