<s>
aufs	B-Application
(	O
short	O
for	O
advanced	O
multi-layered	O
unification	O
filesystem	B-Application
)	O
implements	O
a	O
union	B-Application
mount	I-Application
for	O
Linux	B-Application
file	B-Application
systems	I-Application
.	O
</s>
<s>
Developed	O
by	O
Junjiro	O
Okajima	O
in	O
2006	O
,	O
aufs	B-Application
is	O
a	O
complete	O
rewrite	O
of	O
the	O
earlier	O
UnionFS	B-Application
.	O
</s>
<s>
It	O
aimed	O
to	O
improve	O
reliability	O
and	O
performance	O
,	O
but	O
also	O
introduced	O
some	O
new	O
concepts	O
,	O
like	O
writable	O
branch	O
balancing	O
,	O
and	O
other	O
improvements	O
–	O
some	O
of	O
which	O
are	O
now	O
implemented	O
in	O
the	O
UnionFS	B-Application
2.x	O
branch	O
.	O
</s>
<s>
aufs	B-Application
was	O
rejected	O
for	O
merging	O
into	O
mainline	O
Linux	B-Application
.	O
</s>
<s>
Instead	O
,	O
OverlayFS	B-Application
was	O
merged	O
in	O
the	O
Linux	B-Application
kernel	O
.	O
</s>
<s>
After	O
several	O
attempts	O
to	O
merge	O
aufs	B-Application
into	O
mainline	O
kernel	O
,	O
the	O
author	O
has	O
given	O
up	O
.	O
</s>
<s>
Aufs	B-Application
is	O
included	O
in	O
Debian	O
"	O
Jessie	O
"	O
(	O
v8	O
)	O
and	O
Ubuntu	B-Operating_System
16.04	O
out	O
of	O
the	O
box	O
.	O
</s>
<s>
Debian	O
"	O
Stretch	O
"	O
(	O
v9	O
)	O
does	O
not	O
include	O
aufs	B-Application
anymore	O
,	O
but	O
provides	O
a	O
package	O
aufs-dkms	O
,	O
which	O
auto-compiles	O
the	O
aufs	B-Application
kernel	B-Application
module	I-Application
using	O
Dell	O
's	O
dkms	B-Application
.	O
</s>
<s>
Docker	B-Language
originally	O
used	O
aufs	B-Application
for	O
container	O
filesystem	B-Application
layers	O
.	O
</s>
<s>
It	O
is	O
still	O
available	O
as	O
one	O
of	O
the	O
storage	O
backends	O
but	O
is	O
deprecated	O
in	O
favour	O
of	O
the	O
backend	O
which	O
uses	O
OverlayFS	B-Application
.	O
</s>
<s>
Several	O
Linux	B-Application
distributions	I-Application
have	O
chosen	O
aufs	B-Application
as	O
a	O
replacement	O
for	O
UnionFS	B-Application
,	O
including	O
:	O
</s>
<s>
Puppy	O
Linux	B-Application
versions	O
can	O
run	O
fully	O
in	O
RAM	O
with	O
changes	O
saved	O
to	O
disk	O
on	O
shutdown	O
.	O
</s>
