<s>
resolv.conf	B-Protocol
is	O
the	O
name	O
of	O
a	O
computer	B-Operating_System
file	I-Operating_System
used	O
in	O
various	O
operating	B-General_Concept
systems	I-General_Concept
to	O
configure	O
the	O
system	O
's	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
resolver	O
.	O
</s>
<s>
The	O
resolvconf	B-Protocol
program	O
is	O
one	O
such	O
program	O
on	O
FreeBSD	B-Operating_System
or	O
other	O
Unix	B-Application
machines	O
which	O
manages	O
the	O
resolv.conf	B-Protocol
file	O
.	O
</s>
<s>
In	O
most	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
and	O
others	O
that	O
implement	O
the	O
BIND	B-Protocol
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
resolver	O
library	O
,	O
the	O
resolv.conf	B-Protocol
configuration	B-Protocol
file	I-Protocol
contains	O
information	O
that	O
determines	O
the	O
operational	O
parameters	O
of	O
the	O
DNS	B-Protocol
resolver	O
.	O
</s>
<s>
The	O
DNS	B-Protocol
resolver	O
allows	O
applications	O
running	O
in	O
the	O
operating	B-General_Concept
system	I-General_Concept
to	O
translate	O
human-friendly	O
domain	O
names	O
into	O
the	O
numeric	O
IP	B-Protocol
addresses	I-Protocol
that	O
are	O
required	O
for	O
access	O
to	O
resources	O
on	O
the	O
local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
or	O
the	O
Internet	O
.	O
</s>
<s>
The	O
process	O
of	O
determining	O
IP	B-Protocol
addresses	I-Protocol
from	O
domain	O
names	O
is	O
called	O
address	B-Protocol
resolution	I-Protocol
.	O
</s>
<s>
The	O
file	O
resolv.conf	B-Protocol
typically	O
contains	O
search	O
directives	O
that	O
specify	O
the	O
default	O
search	B-Protocol
domains	I-Protocol
used	O
for	O
completing	O
a	O
given	O
query	O
name	O
to	O
a	O
fully	B-Protocol
qualified	I-Protocol
domain	I-Protocol
name	I-Protocol
when	O
no	O
domain	O
suffix	O
is	O
supplied	O
.	O
</s>
<s>
It	O
also	O
contains	O
a	O
list	O
of	O
IP	B-Protocol
addresses	I-Protocol
of	O
nameservers	B-Protocol
for	O
resolution	O
.	O
</s>
<s>
For	O
instance	O
,	O
nameserver	B-Protocol
1.1.1.1	O
configures	O
the	O
resolver	O
to	O
query	O
for	O
the	O
name	B-Protocol
server	I-Protocol
with	O
IP	O
1.1.1.1	O
.	O
</s>
<s>
Additional	O
nameserver	B-Protocol
directives	O
after	O
the	O
first	O
are	O
only	O
used	O
when	O
the	O
first	O
or	O
last	O
used	O
server	O
is	O
unavailable	O
.	O
</s>
<s>
resolv.conf	B-Protocol
is	O
usually	O
located	O
in	O
the	O
directory	O
/etc	B-Application
of	O
the	O
file	B-Application
system	I-Application
.	O
</s>
<s>
The	O
file	O
is	O
either	O
maintained	O
manually	O
,	O
or	O
when	O
DHCP	B-Protocol
is	O
used	O
,	O
it	O
is	O
usually	O
updated	O
with	O
the	O
utility	O
resolvconf	B-Protocol
.	O
</s>
<s>
In	O
systemd	B-Application
based	O
Linux	O
distributions	O
using	O
systemd-resolved.service	O
,	O
/etc/resolv.conf	B-Protocol
is	O
a	O
symlink	O
to	O
/run/systemd/resolve/stub	O
-resolv.conf	O
.	O
</s>
