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.