Debian 13 LXC await network timeout

[Lombra]

Hi,

I created a Debian 13 container from a template built using the Debian Appliance Builder. When installing docker.io (and on every subsequent boot), the service startup is delayed by two minutes as it waits for systemd-networkd-wait-online to time out. This seems to happen due to the following file existing:

/etc/systemd/system/network-online.target.wants/systemd-networkd-wait-online.service

I don't know exactly where the blame should lie, but as far as I understand, the timing out is expected when using /etc/network/interfaces, so the file shouldn't be there in the first place? It is also not present in the PVE-provided Debian 12 template, does not get added when upgrading that to Debian 13, and is also not present in a minimal Debian 13 net install VM.

I can probably just remove the file and be on my way, but this seems incorrect somehow.

Aug 18 16:27:16 wolf7 systemd[1]: Starting docker.socket - Docker Socket for the API...
Aug 18 16:27:16 wolf7 systemd[1]: Starting ifupdown-wait-online.service - Wait for network to be configured by ifupdown...
Aug 18 16:27:16 wolf7 systemd[1]: Starting systemd-networkd-wait-online.service - Wait for Network to be Configured...
Aug 18 16:27:16 wolf7 systemd[1]: Listening on docker.socket - Docker Socket for the API.
Aug 18 16:27:16 wolf7 systemd[1]: Finished ifupdown-wait-online.service - Wait for network to be configured by ifupdown.
Aug 18 16:29:16 wolf7 systemd-networkd-wait-online[1155]: Timeout occurred while waiting for network connectivity.
Aug 18 16:29:16 wolf7 systemd[1]: systemd-networkd-wait-online.service: Main process exited, code=exited, status=1/FAILURE
Aug 18 16:29:16 wolf7 systemd[1]: systemd-networkd-wait-online.service: Failed with result 'exit-code'.
Aug 18 16:29:16 wolf7 systemd[1]: Failed to start systemd-networkd-wait-online.service - Wait for Network to be Configured.
Aug 18 16:29:16 wolf7 systemd[1]: Reached target network-online.target - Network is Online.
Aug 18 16:29:16 wolf7 systemd[1]: Starting docker.service - Docker Application Container Engine...
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[fstrankowski]

I just encountered this exact behaviour on our machines aswell while using the default Proxmox LXC Debian 13 template.

systemd-networkd-wait-online.service didnt exist in bookworm images.

What i did to solve this problem was:

1. systemctl edit systemd-networkd-wait-online.service

2. Add the following as override

[Service]
ExecStart=
ExecStart=/usr/lib/systemd/systemd-networkd-wait-online --interface=eth0 --timeout=30

I yet have to discover why the system runs into timeout. When i force networkd to only wait for eth0 it works just fine.
Checking with networkctl while the system waits for interfaces to become online shows that eth0 is in "routable" mode, so up and running.

AFAIK systemd-networkd-wait-online should be disabled by default as Proxmox uses ifupdown2 and /etc/network/interfaces and not systemd for LXC.