Bug#1009351: systemd: Static IP addressing (from config) in LXC containers not working anymore

[Claudio Kuenzler]

> Can you attach the output of
> systemctl status systemd-networkd.service
> journalctl -ulb systemd-networkd.service
>
> for both containers.
>

Older 11.2 container:

root at 11-2:~# systemctl status systemd-networkd.service
Warning: The unit file, source configuration file or drop-ins of
systemd-networkd.service changed on disk. Run 'systemctl daemon-reload' to
reload units.
● systemd-networkd.service
     Loaded: masked (Reason: Unit systemd-networkd.service is masked.)
    Drop-In: /run/systemd/system/service.d
             └─zzz-lxc-service.conf
     Active: inactive (dead)

root at 11-2:~# journalctl -ulb systemd-networkd.service
Failed to add match 'systemd-networkd.service': Invalid argument


Newly created 11.3 container (11test2):

root at 11test2:~#  systemctl status systemd-networkd.service
● systemd-networkd.service - Network Service
     Loaded: loaded (/lib/systemd/system/systemd-networkd.service;
disabled; vendor preset: enabled)
    Drop-In: /run/systemd/system/service.d
             └─zzz-lxc-service.conf
     Active: active (running) since Tue 2022-04-12 13:56:00 UTC; 34s ago
TriggeredBy: ● systemd-networkd.socket
       Docs: man:systemd-networkd.service(8)
   Main PID: 85 (systemd-network)
     Status: "Processing requests..."
      Tasks: 1 (limit: 619000)
     Memory: 4.0M
        CPU: 38ms
     CGroup: /system.slice/systemd-networkd.service
             └─85 /lib/systemd/systemd-networkd

Apr 12 13:55:59 11test2 systemd[1]: Starting Network Service...
Apr 12 13:56:00 11test2 systemd-networkd[85]: eth0: Gained IPv6LL
Apr 12 13:56:00 11test2 systemd-networkd[85]: Enumeration completed
Apr 12 13:56:00 11test2 systemd[1]: Started Network Service.

root at 11test2:~#  journalctl -ulb systemd-networkd.service
Failed to add match 'systemd-networkd.service': Invalid argument

There's the following diff in the zzz-lxc-service.conf:

root at 11test2:~# diff /run/systemd/system/service.d/zzz-lxc-service.conf
/tmp/zzz-lxc-service-11.2.conf
2d1
< ProcSubset=all

So the reason for the previously working case seems to be because the
systemd-networkd service was actually masked before.
Where and why the mask did come from? No idea...


>
> If systemd-networkd wasn't running in your old, 11.2 based container, it
> couldn't interfere with your custom network setup.
>
> This is btw I recommended to disable systemd-networkd as the correct
> solution for your issue.
>

Yes, that's fine for me. I'll adjust our template for that case. In Ubuntu
we need to do the same with Netplan.
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