ubuntu/20.04LTS/kresdについて、ここに記述してください。

https://knot-resolver.readthedocs.io/en/stable/quickstart-startup.html

== 手動起動 ==
{{{
$ sudo systemctl start kresd@1.service
tmaeno@nve20:~$ ps ax | grep kresd
   6526 ?        Ss     0:00 /usr/sbin/kresd -c /usr/lib/knot-resolver/distro-preconfig.lua -c /etc/knot-resolver/kresd.conf -n
   6546 pts/0    S+     0:00 grep --color=auto kresd
}}}

== boot時に起動 ==
{{{
$sudo systemctl enable --now kresd@1.service
Created symlink /etc/systemd/system/kresd.target.wants/kresd@1.service → /lib/systemd/systemkresd@.service.
}}}

== /etc/resolv.conf ==
symbolic linkをやめて、ファイルを作るのがいいか。-- ToshinoriMaeno <<DateTime(2020-07-11T08:29:11+0900)>>

== restart ==
https://manpages.debian.org/testing/knot-resolver/kresd.systemd.7.en.html

systemctl restart 'kresd@*'