I gave the "loopback" trick a go like so:
root@b1:~# cat /etc/systemd/network/10-netplan-lo.network
[Match]
Name=lo
[Network]
Address=127.0.0.1
DNS=10.90.90.1
Domains=maaslab maas
root@b1:~# networkctl status --all
● 1: lo
Link File: n/a
Network File: /etc/systemd/network/10-netplan-lo.network
Type: loopback
State: carrier (configured)
Address: 127.0.0.1
::1
DNS: 10.90.90.1
Search Domains: maaslab
maas
● 38: eth0
Link File: n/a
Network File: /run/systemd/network/10-netplan-eth0.network
Type: ether
State: routable (configured)
HW Address: 00:16:3e:4c:5b:4b (Xensource, Inc.)
Address: 10.8.107.71
fe80::216:3eff:fe4c:5b4b
Gateway: 10.8.107.1
DNS: 10.8.107.1
Search Domains: lxd
root@b1:~# systemd-resolve --status --no-pager
Global
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test
Link 38 (eth0)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 10.8.107.1
DNS Domain: lxd
networkctl processed the .network file but systemd-resolved didn't seem to
notice it.
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https://bugs.launchpad.net/bugs/1750884
Title:
[2.4, bionic] /etc/resolv.conf not configured correctly in Bionic,
leads to no DNS resolution
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