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
Default configuration is defined during compilation, so a
configuration file is only needed when it is necessary to deviate
from those defaults. By default the configuration file in
/etc/systemd/
contains commented out entries
showing the defaults as a guide to the administrator. This file
can be edited to create local overrides.
When packages need to customize the configuration, they can
install configuration snippets in
/usr/lib/systemd/*.conf.d/
. Files in
/etc/
are reserved for the local
administrator, who may use this logic to override the
configuration files installed by vendor packages. The main
configuration 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. Files in the
*.conf.d/
configuration subdirectories
are sorted by their filename in lexicographic order, regardless of
which of the subdirectories they reside in. If multiple files
specify the same option, the entry in the file with the
lexicographically latest name takes precedence. It is recommended
to prefix all filenames in those subdirectories with a two-digit
number and a dash, to simplify the ordering of the files.
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.
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.