104.3. Control mounting and unmounting of filesystems

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Configure the mounting of a filesystem. Tasks include manually mounting and unmounting filesystems, configuring filesystem mounting on bootup, and configuring user-mountable removable filesystems.

  • Mount and unmount filesystems manually
  • Configure filesystem mounting on bootup
  • Configure user-mountable, removable filesystems

Mounting and Unmounting

  • Describe the linux filesystem concept. A huge tree.
  • There are other kinds of mountings: tmpfs, NFS, ..
  • It is better to mount on empty directories

Basic commands

cat /etc/fstab
mount /dev/sda1 /media
umount /media

Some switches

mount -t ext4 /dev/sda1 /media
mount -o remount,ro /dev/sda1

Get info on UUID and Label and Format

blkid /dev/sda2



  • file system: Label, UUID, device
  • mount point: swap or none for swap
  • type: can be auto
  • options: defaults, rw / ro, noauto, user, exec / noexec, noatime
  • dump: do dump command backup this? mostly 0
  • pass: Non-zero values of pass specify the order of checking filesystems at boot time (seen in Integrity of file systems)


  • User-mounted filesystems default to noexec unless exec is specified after user.
  • noatime will disable recording of access times. Not using access times may improve performance.


swapon -s

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