Paket:

• systemd-resolved

Dienst starten:

systemctl enable --now systemd-resolved.service

Testen:

resolvectl query www.linuxhotel.de

/etc/nsswitch.conf

…
  hosts: files … resolve [!UNAVAIL=return] … myhostname
…

Testen:

getent ahosts www.linuxhotel.de

readlink /etc/resolv.conf

→ ../run/systemd/resolve/stub-resolv.conf

grep nameserver /etc/resolv.conf

→ nameserver 127.0.0.53

Testen:

host www.linuxhotel.de
dig www.linuxhotel.de

von Hand:

resolvectl dns br0 192.168.236.11
resolvectl domain br0 z36.internal

automatisch: z.B. per DHCP

Einstellungen ansehen:

resolvectl status br0

Testen:

resolvectl query vm1
getent hosts vm1

DNSSEC aktivieren, um z.B. SSHFP zu ermöglichen:

grep options /etc/resolv.conf

→ options edns0 trust-ad

mkdir /etc/systemd/resolved.conf.d

/etc/systemd/resolved.conf.d/local.conf

[Resolve]
 
DNSSEC=allow-downgrade

systemctl kill --signal=HUP systemd-resolved.service

Testen:

resolvectl status

→ DNSSEC=allow-downgrade/supported

dig NS de

→ flags: … ad