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FSTAB(5) File formats FSTAB(5)
NAME
fstab - static information about the filesystems
SYNOPSIS
/etc/fstab
DESCRIPTION
The file fstab contains descriptive information about the filesystems the system can
mount. fstab is only read by programs, and not written; it is the duty of the system
administrator to properly create and maintain this file. The order of records in fstab is
important because fsck(8), mount(8), and umount(8) sequentially iterate through fstab
doing their thing.
Each filesystem is described on a separate line. Fields on each line are separated by tabs
or spaces. Lines starting with '#' are comments. Blank lines are ignored.
The following is a typical example of an fstab entry:
LABEL=t-home2 /home ext4 defaults,auto_da_alloc 0 2
The first field (fs_spec).
This field describes the block special device, remote filesystem or filesystem image for
loop device to be mounted or swap file or swap partition to be enabled.
For ordinary mounts, it will hold (a link to) a block special device node (as created by
mknod(2)) for the device to be mounted, like /dev/cdrom or /dev/sdb7. For NFS mounts, this
field is <host>:<dir>, e.g., knuth.aeb.nl:/. For filesystems with no storage, any string
can be used, and will show up in df(1) output, for example. Typical usage is proc for
procfs; mem, none, or tmpfs for tmpfs. Other special filesystems, like udev and sysfs, are
typically not listed in fstab.
LABEL=<label> or UUID=<uuid> may be given instead of a device name. This is the
recommended method, as device names are often a coincidence of hardware detection order,
and can change when other disks are added or removed. For example, 'LABEL=Boot' or
'UUID=3e6be9de-8139-11d1-9106-a43f08d823a6'. (Use a filesystem-specific tool like
e2label(8), xfs_admin(8), or fatlabel(8) to set LABELs on filesystems).
It's also possible to use PARTUUID= and PARTLABEL=. These partitions identifiers are
supported for example for GUID Partition Table (GPT).
See mount(8), blkid(8) or lsblk(8) for more details about device identifiers.
Note that mount(8) uses UUIDs as strings. The string representation of the UUID should be
based on lower case characters. But when specifying the volume ID of FAT or NTFS file
systems upper case characters are used (e.g UUID="A40D-85E7" or UUID="61DB7756DB7779B3").
The second field (fs_file).
This field describes the mount point (target) for the filesystem. For swap partitions,
this field should be specified as `none'. If the name of the mount point contains spaces
or tabs these can be escaped as `\040' and '\011' respectively.
The third field (fs_vfstype).
This field describes the type of the filesystem. Linux supports many filesystem types:
ext4, xfs, btrfs, f2fs, vfat, ntfs, hfsplus, tmpfs, sysfs, proc, iso9660, udf, squashfs,
nfs, cifs, and many more. For more details, see mount(8).
An entry swap denotes a file or partition to be used for swapping, cf. swapon(8). An entry
none is useful for bind or move mounts.
More than one type may be specified in a comma-separated list.
mount(8) and umount(8) support filesystem subtypes. The subtype is defined by '.subtype'
suffix. For example 'fuse.sshfs'. It's recommended to use subtype notation rather than add
any prefix to the first fstab field (for example 'sshfs#example.com' is deprecated).
The fourth field (fs_mntops).
This field describes the mount options associated with the filesystem.
It is formatted as a comma-separated list of options. It contains at least the type of
mount (ro or rw), plus any additional options appropriate to the filesystem type
(including performance-tuning options). For details, see mount(8) or swapon(8).
Basic filesystem-independent options are:
defaults
use default options: rw, suid, dev, exec, auto, nouser, and async.
noauto
do not mount when mount -a is given (e.g., at boot time)
user
allow a user to mount
owner
allow device owner to mount
comment
or x-<name> for use by fstab-maintaining programs
nofail
do not report errors for this device if it does not exist.
The fifth field (fs_freq).
This field is used by dump(8) to determine which filesystems need to be dumped. Defaults
to zero (don't dump) if not present.
The sixth field (fs_passno).
This field is used by fsck(8) to determine the order in which filesystem checks are done
at boot time. The root filesystem should be specified with a fs_passno of 1. Other
filesystems should have a fs_passno of 2. Filesystems within a drive will be checked
sequentially, but filesystems on different drives will be checked at the same time to
utilize parallelism available in the hardware. Defaults to zero (don't check the
filesystem) if not present.
FILES
/etc/fstab, <fstab.h>
NOTES
The proper way to read records from fstab is to use the routines getmntent(3) or libmount.
The keyword ignore as a filesystem type (3rd field) is no longer supported by the pure
libmount based mount utility (since util-linux v2.22).
HISTORY
The ancestor of this fstab file format appeared in 4.0BSD.
SEE ALSO
getmntent(3), fs(5), findmnt(8), mount(8), swapon(8)
REPORTING BUGS
For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.
AVAILABILITY
fstab is part of the util-linux package which can be downloaded from Linux Kernel Archive
<https://www.kernel.org/pub/linux/utils/util-linux/>.
util-linux 2.37.2 2021-06-02 FSTAB(5)
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