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			{{Short description\|File system}}
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			{{lowercase}}
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			{{distinguish\|AUFS}}
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			{{Infobox filesystem
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			\| name = aufs
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			\| full_name = Advanced multi layered unification filesystem
	<!-- Do not use the "dated prod" template directly; the above line is generated by "subst:prod\|reason" -->
			\| developer = ]
	'''Aufs''' (AnotherUnionFS) is an alternative version of ], a filesystem service which implements a ] for ] ]s. It has been developed by ] since early 2006 <ref></ref>.
			\| introduction_os =
			\| introduction_date = 2006
			\| partition_id =
			\| directory_struct =
			\| file_struct =
			\| bad_blocks_struct =
			\| max_filename_size =
			\| max_files_no =
			\| max_volume_size =
			\| max_file_size =
			\| filename_character_set =
			\| dates_recorded =
			\| date_range =
			\| date_resolution =
			\| forks_streams =
			\| attributes =
			\| file_system_permissions = ]
			\| compression =
			\| encryption =
			\| OS = ] via third-party ]
			}}

			'''aufs''' (short for '''advanced multi-layered unification filesystem''') implements a ] for ] ]s. The name originally stood for '''AnotherUnionFS''' until version 2.
⚫	It is a complete ~~rewriting~~ of ~~UnionFS,~~ ~~with~~ ~~the~~ ~~aim~~ of ~~improving~~ reliability and performance. ~~It has~~ also introduced some new concepts, like writable branch balancing, ~~and many improvements~~ <ref></ref>. ~~Some~~ of ~~these~~ ~~new~~ ~~ideas~~ ~~have~~ ~~been~~ ~~re-~~implemented in the UnionFS 2.x branch.

		⚫	Developed by ] in 2006,<ref>{{cite web\|title=History of aufs\|url=http://aufs.sourceforge.net/History\|access-date=2015-11-08}}</ref> aufs is a complete rewrite of the earlier ]. It aimed to improve reliability and performance, but also introduced some new concepts, like writable branch balancing,<ref></ref> and other improvements – some of which are now implemented in the UnionFS 2.x branch.
	Aufs has been chosen as a replacement for UnionFS by the ] ] ] since the end of 2006, "for better stability & performance"<ref> explaining the switch from UnionFS to aufs.</ref> This unioning service replaced UnionFS in ] (and Linux-Live scripts in general) since version 6. <ref> use AUFS for better stability.</ref>

			aufs was rejected for merging into mainline Linux. Its code was criticized for being "dense, unreadable, uncommented".<ref>{{cite web\|last1=Aurora\|first1=Valerie\|title=Unioning file systems: Implementations, part 2\|url=https://lwn.net/Articles/327738/\|website=]\|access-date=2015-11-08\|date=2009-04-07}}</ref> Instead, ] was merged in the Linux kernel.<ref>{{cite web\|url=https://github.com/torvalds/linux/commit/e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c\|title=overlay filesystem · torvalds/linux@e9be9d5\|website=] \|access-date=12 July 2016}}</ref><ref>{{cite web\|last1=Hellwig\|first1=Christoph\|title=Re: export lookup functions\|url=http://marc.info/?l=linux-kernel&m=123938533724484&w=2\|access-date=2015-11-08\|date=2009-04-10}}</ref> After several attempts to merge aufs into mainline kernel, the author has given up.<ref>{{cite web\|last1=Okajima\|first1=Junjiro\|title=Re: export lookup functions\|url=https://marc.info/?l=linux-kernel&m=123938442923108\|access-date=2018-10-01\|date=2009-04-10}}</ref>
⚫	~~Aufs replaced UnionFS in~~ ] Linux distribution, available in the ASUS ] model 901.

			==Use==
	Aufs is used in ] 2009.08 instead of UnionFS.<ref>http://www.archlinux.org/news/459/</ref>
			Aufs is included in ] "Jessie" (v8) and ] 16.04 out of the box. Debian "Stretch" (v9) does not include aufs anymore, but provides a package aufs-dkms, which auto-compiles the aufs kernel module using ]'s ].

			] originally used aufs for container filesystem layers. It is still available as one of the storage backends but is deprecated in favour of the {{mono\|overlay2}} backend which uses ].<ref>{{cite web\|title=Deprecated Engine Features\|website=] \|url=https://github.com/docker/cli/blob/master/docs/deprecated.md\|access-date=2020-10-26}}</ref>
	== Notes ==
	<references />

			Several ]s have chosen aufs as a replacement for UnionFS, including:
⚫	== See also ==
			* ] ] ] – since the end of 2006, "for better stability and performance"<ref>{{cite web\|title=KNOPPIX 5.1 - Live Linux Filesystem On CD\|url=http://www.knopper.net/knoppix/knoppix51-en.html\|publisher=knopper.net\|access-date=2015-11-08\|date=2013-01-05}}</ref>
			* ] since version 2008. Switched simultaneously with Linux-Live
			* ] LiveCD, run fully in RAM
			* ] (and Linux-Live scripts in general) since version 6<ref> {{Webarchive\|url=https://web.archive.org/web/20090322090540/http://www.linux-live.org/?changes \|date=2009-03-22 }} use AUFS for better stability</ref>
		⚫	* ] Linux distribution, available in the ASUS ] model 901
			* ] 10.04 LTS Live CD
			* ] 6.0 Live media
			* ] LiveDVD 11.0<ref>{{cite web\|url=http://www.gentoo.org/news/20110308-livedvd.xml \|title=Gentoo Linux - Gentoo Linux - LiveDVD 11.0 \|publisher=Gentoo.org \|date=2011-03-08 \|access-date=2012-04-19 \|url-status=dead \|archive-url=https://web.archive.org/web/20120413110015/http://www.gentoo.org/news/20110308-livedvd.xml \|archive-date=2012-04-13 }}</ref>
			* ] LiveDVD 11.2<ref>{{cite web\|url=http://www.gentoo.org/news/20110807-livedvd.xml \|title=Gentoo Linux - Gentoo Linux releases 11.2 LiveDVD \|publisher=Gentoo.org \|date=2011-08-07 \|access-date=2012-04-19 \|url-status=dead \|archive-url=https://web.archive.org/web/20120417064501/http://www.gentoo.org/news/20110807-livedvd.xml \|archive-date=2012-04-17 }}</ref>
			* ] LiveDVD 12.0<ref>{{cite web\|url=http://www.gentoo.org/news/20120102-livedvd.xml \|title=Gentoo Linux - Gentoo Linux releases 12.0 LiveDVD \|publisher=Gentoo.org \|date=2012-01-02 \|access-date=2012-04-19 \|url-status=dead \|archive-url=https://web.archive.org/web/20120421204113/http://www.gentoo.org/news/20120102-livedvd.xml \|archive-date=2012-04-21 }}</ref>
			* ] via Linux-Live scripts until version 13.1.1 and via SaLT from version 13.37
			* ] versions can run fully in RAM with changes saved to disk on shutdown. For example, Slacko 5.3.3 running as a LiveCD.
			* ] via their patched official kernels <ref>{{cite web\|url=https://gitlab.manjaro.org/packages/core/linux54/blob/master/PKGBUILD \|title=Manjaro linux54 kernel PKGBUILD\|date=2020-01-19 \|access-date=2020-01-19}}</ref>

		⚫	==See also==
			{{Portal\|Free and open-source software}}
			* ], the competing project that was chosen for merger to the Linux core
	* ]		* ]
	* ], describing the concept of merging file system branches		* ], describing the concept of merging file system branches
	* ], an older union mount project~~, developed by Professor Erez Zadok and his team at Stony Brook University.~~		* ], an older union mount project
			* ]

			==References==
			{{Reflist}}

	== External links ==		==External links==
	*		*
	*		*

			{{File systems}}
⚫	]
⚫	]

		⚫	]
	]
			]
	]
		⚫	]
	]
	]
	]

Latest revision as of 18:52, 19 April 2023

File system Not to be confused with AUFS.

aufs
Features
Developer(s)	Junjiro Okajima
Full name	Advanced multi layered unification filesystem
Introduced	2006
File system permissions	POSIX
Other
Supported operating systems	Linux via third-party kernel module

aufs (short for advanced multi-layered unification filesystem) implements a union mount for Linux file systems. The name originally stood for AnotherUnionFS until version 2.

Developed by Junjiro Okajima in 2006, aufs is a complete rewrite of the earlier UnionFS. It aimed to improve reliability and performance, but also introduced some new concepts, like writable branch balancing, and other improvements – some of which are now implemented in the UnionFS 2.x branch.

aufs was rejected for merging into mainline Linux. Its code was criticized for being "dense, unreadable, uncommented". Instead, OverlayFS was merged in the Linux kernel. After several attempts to merge aufs into mainline kernel, the author has given up.

Use

Aufs is included in Debian "Jessie" (v8) and Ubuntu 16.04 out of the box. Debian "Stretch" (v9) does not include aufs anymore, but provides a package aufs-dkms, which auto-compiles the aufs kernel module using Dell's dkms.

Docker originally used aufs for container filesystem layers. It is still available as one of the storage backends but is deprecated in favour of the overlay2 backend which uses OverlayFS.

Several Linux distributions have chosen aufs as a replacement for UnionFS, including:

Knoppix live CD Linux distribution – since the end of 2006, "for better stability and performance"
NimbleX since version 2008. Switched simultaneously with Linux-Live
Porteus LiveCD, run fully in RAM
Slax (and Linux-Live scripts in general) since version 6
Xandros Linux distribution, available in the ASUS Eee PC model 901
Ubuntu 10.04 LTS Live CD
Debian 6.0 Live media
Gentoo Linux LiveDVD 11.0
Gentoo Linux LiveDVD 11.2
Gentoo Linux LiveDVD 12.0
Salix Live via Linux-Live scripts until version 13.1.1 and via SaLT from version 13.37
Puppy Linux versions can run fully in RAM with changes saved to disk on shutdown. For example, Slacko 5.3.3 running as a LiveCD.
Manjaro Linux via their patched official kernels

References

"History of aufs". Retrieved 2015-11-08.
Goals and new features of aufs in the project's homepage
Aurora, Valerie (2009-04-07). "Unioning file systems: Implementations, part 2". LWN.net. Retrieved 2015-11-08.
"overlay filesystem · torvalds/linux@e9be9d5". GitHub. Retrieved 12 July 2016.
Hellwig, Christoph (2009-04-10). "Re: [RFC Aufs2 #5 28/29] export lookup functions". Retrieved 2015-11-08.
Okajima, Junjiro (2009-04-10). "Re: [RFC Aufs2 #5 28/29] export lookup functions". Retrieved 2018-10-01.
"Deprecated Engine Features". GitHub. Retrieved 2020-10-26.
"KNOPPIX 5.1 - Live Linux Filesystem On CD". knopper.net. 2013-01-05. Retrieved 2015-11-08.
Linux Live scripts Archived 2009-03-22 at the Wayback Machine use AUFS for better stability
"Gentoo Linux - Gentoo Linux - LiveDVD 11.0". Gentoo.org. 2011-03-08. Archived from the original on 2012-04-13. Retrieved 2012-04-19.
"Gentoo Linux - Gentoo Linux releases 11.2 LiveDVD". Gentoo.org. 2011-08-07. Archived from the original on 2012-04-17. Retrieved 2012-04-19.
"Gentoo Linux - Gentoo Linux releases 12.0 LiveDVD". Gentoo.org. 2012-01-02. Archived from the original on 2012-04-21. Retrieved 2012-04-19.
"Manjaro linux54 kernel PKGBUILD". 2020-01-19. Retrieved 2020-01-19.

External links

File systems

Disk and
non-rotating

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AdvFS
Amiga FFS
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bcachefs
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Optical disc

Flash memory and SSD

host-side wear leveling	CHFS JFFS JFFS2 LogFS NILFS NILFS2 YAFFS UBIFS

Distributed parallel

NAS

Specialized

Aufs AXFS Boot File System Compact Disc File System cramfs Davfs2 EROFS FTPFS FUSE Lnfs LTFS NOVA MVFS SquashFS UMSDOS OverlayFS UnionFS
Pseudo	configfs devfs debugfs kernfs procfs specfs sysfs tmpfs WinFS
Encrypted	eCryptfs EncFS EFS Rubberhose SSHFS ZFS

Types

Features

Case preservation Copy-on-write Data deduplication Data scrubbing Execute in place Extent File attribute Extended file attributes File change log Fork Links Hard Symbolic
Access control	Access-control list Filesystem-level encryption Permissions Modes Sticky bit

Interfaces

Lists

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Categories:

Latest revision as of 18:52, 19 April 2023

Use

See also

References

External links