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fstab

fstab⚑

fstab is a file(/etc/fstab) that contains descriptive information about the filesystems the system can mount.

  • a program would never write to fstab. It is meant to be read.
  • the order of records is important because fsck, mount and unmount sequentially iterate through fstab to perform their tasks

Example⚑

# Static information about the filesystems.
# See fstab(5) for details.

# <file system> <dir> <type> <options> <dump> <pass>
# /dev/nvme0n1p7
UUID=a4d7ea29-37e9-4326-be28-67c703105ab4   /           ext4        rw,relatime 0 1

# /dev/nvme0n1p1 LABEL=SYSTEM
UUID=FE69-C493          /boot       vfat        rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro   0 2

# /dev/nvme0n1p6
UUID=9ffe7bfa-bb2f-4c5f-9f15-efbfbd0f1299   none        swap        defaults    0 0
  • <file system>: name of the fs
  • <dir>: mount point
  • <type>: type of filesystem
  • <options>: options for mount
  • <dump>: passed to dump utility. dump checks ext2/3 filesystems and determine which files need to backed-up..and copies them to given disk
  • <pass>: this is the order of filesystems fsck use to check fs at boottime