Fstab defaults update#

To do this, you can use common applications like gparted to label partitions or you can use e2label to label ext2, ext3, and ext4 partitions. The device or partition is required to be labelled first. blkid will show you the UUIDs of mounted devices and partitions: # blkid UUIDs are generated by the make-filesystem utilities (mkfs.*) when you create a filesystem. You can get kernel naming descriptors using fdisk: # fdisk -lĪn example /etc/fstab using the kernel naming: # LVM snapshots can result in duplicate UUIDs and labels, so LVM logical volumes should always be identified by logical volume name ( /dev/mapper/ name). This is useful if you change your storage device order in the BIOS, you switch storage device cabling, or because some BIOS's may occasionally change the order of storage devices. The advantage of using UUIDs or labels is that they are not dependent on disk order. You can define the filesystems in the /etc/fstab configuration in three different ways: by kernel naming descriptors, by UUID, or by labels. File systems with a value 0 will not be checked by the fsck utility. The root file system should have the highest priority, 1, all other file systems you want to have checked should get a 2. fsck reads the number and determines in which order the file systems should be checked. Most users will not have dump installed, so they should put 0 for the entry. If 0, dump will ignore the file system, if 1, dump will make a backup. When installed, dump checks the entry and uses the number to decide if a file system should be backed up. is used by the dump utility to decide when to make a backup. Access time is only updated if the previous access time was earlier than the current modify or change time (similar to noatime, but doesn't break mutt or other applications that need to know if a file has been read since the last time it was modified).

Fstab defaults update#

Relatime - update inode access times relative to modify or change time. You do not need to enable this flag if you have already enabled noatime. Nodiratime - do not update directory inode access times on the filesystem. Noatime - do not update inode access times on the filesystem. Nosuid - block the operation of suid, and sgid bits. They are mostly used to allow users on a computer system to execute binary executables with temporarily elevated privileges in order to perform a specific task. Suid - allow the operation of suid, and sgid bits.

Nouser - only allow root to mount the filesystem (default).ĭefaults - default mount settings (equivalent to rw,suid,dev,exec,auto,nouser,async). User - permit any user to mount the filesystem (implies noexec,nosuid,nodev unless overridden). Noexec - do not allow binaries to be executed on the filesystem.Īsync - I/O should be done asynchronously.įlush - specific option for FAT to flush data more often, thus making copy dialogs or progress bars to stays up until things are on the disk. Noauto - the filesystem is mounted only when you tell it to.Įxec - allow the execution binaries that are on that partition (default). Some of the more common options are:Īuto - file system will mount automatically at boot, or when the command 'mount -a' is issued. Some options relate only to the filesystem itself. define particular options for filesystems. The 'auto' type lets the mount command to attempt to guess what type of file system is used, this is useful for removable devices such as CDs and DVDs. Some examples are: ext2, ext3, reiserfs, xfs, jfs, smbfs, iso9660, vfat, ntfs, swap, and auto. Many different file systems are supported. defines the file system type of the device or partition to be mounted. tells the mount command where it should mount the to. etc/fstab contains the following fields separated by a space or tab: It is not necessary to list /proc and /sys in the fstab unless some special options are needed.