resolved.conf, resolved.conf.d — Network Name Resolution configuration files
/etc/systemd/resolved.conf
/etc/systemd/resolved.conf.d/*.conf
/run/systemd/resolved.conf.d/*.conf
/usr/lib/systemd/resolved.conf.d/*.conf
Configuration files are read from directories in
/etc/, /run/, and
/usr/lib/, in order of precedence.
Each configuration file in these configuration directories shall be named in
the style of filename.conf/etc/ override files with the same name in
/run/ and /usr/lib/. Files in
/run/ override files with the same name in
/usr/lib/.
Packages should install their configuration files in
/usr/lib/. Files in /etc/ are
reserved for the local administrator, who may use this logic to override the
configuration files installed by vendor packages. All configuration files
are sorted by their filename in lexicographic order, regardless of which of
the directories they reside in. If multiple files specify the same option,
the entry in the file with the lexicographically latest name will take
precedence. It is recommended to prefix all filenames with a two-digit number
and a dash, to simplify the ordering of the files.
If the administrator wants to disable a configuration file supplied by
the vendor, the recommended way is to place a symlink to
/dev/null in the configuration directory in
/etc/, with the same filename as the vendor
configuration file.
Configuration is also read from a single configuration file in
/etc/. This file is read before any of the
configuration directories, and has the lowest precedence; entries in a file
in any configuration directory override entries in the single configuration
file.
DNS=¶A space separated list
of IPv4 and IPv6 addresses to be used
as system DNS servers. DNS requests
are sent to one of the listed DNS
servers in parallel to any
per-interface DNS servers acquired
from
systemd-networkd.service(8). For
compatibility reasons, if set to the
empty list the DNS servers listed in
/etc/resolv.conf
are used, if any are
configured there. This setting
defaults to the empty
list.
FallbackDNS=¶A space separated list
of IPv4 and IPv6 addresses to be used
as the fallback DNS servers. Any
per-interface DNS servers obtained
from
systemd-networkd.service(8)
take precedence over this setting, as
do any servers set via
DNS= above or
/etc/resolv.conf. This
setting is hence only used if no other
DNS server information is known. If
this option is not given, a
compiled-in list of DNS servers is
used instead.
LLMNR=¶Takes a boolean
argument or
"resolve". Controls
Link-Local Multicast Name Resolution support (RFC
4794) on the local host. If
true enables full LLMNR responder and
resolver support. If false disable
both. If set to
"resolve" only
resolving support is enabled, but
responding is disabled. Note that
systemd-networkd.service(8)
also maintains per-interface LLMNR
settings. LLMNR will be enabled on an
interface only if the per-interface
and the global setting is
on.