I've been using the same OVH Kimsufi server since 2013, and Systemd has changed a lot since its setup.
Systemd 246, avalaible as Archlinux packages since late July 2020, deprecates support of the .include directive
This directive was used by the netctl service to configure network during startup:
| % cat /etc/systemd/system/netctl@ovh_net_eth0.service
.include /usr/lib/systemd/system/netctl@.service
[Unit]
Description=A basic static ethernet connection
BindsTo=sys-subsystem-net-devices-eth0.device
After=sys-subsystem-net-devices-eth0.device
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If the service unit was not migrated, the system will not have its network config applied during next boot:
| Sep 24 11:25:39 ovh systemd[1]: netctl@ovh_net_eth0.service: Cannot add dependency job, ignoring: Unit netctl@ovh_net_eth0.service has a bad unit file setting.
Sep 24 11:25:39 ovh systemd[1]: netctl@ovh_net_eth0.service: Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing.
Sep 24 11:25:39 ovh systemd[1]: /etc/systemd/system/netctl@ovh_net_eth0.service:1: Assignment outside of section. Ignoring.
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The easiest way to migrate this configuration is to disable the outdated service, remove it, and enable it again:
| systemctl disable netctl@ovh_net_eth0.service
rm /etc/systemd/system/netctl@ovh_net_eth0.service
netctl enable ovh_net_eth0
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