[systemd-devel] starting networking from within single user mode?

[Brian Reichert]

On Fri, Nov 11, 2022 at 08:08:58AM +0200, Mantas Mikul??nas wrote:
> Boot with either "s" (aka "single" aka "rescue") or "-b" (aka "emergency")
> for two variants of single-user mode with init. The former starts some
> basic stuff (it's the real single-user mode) including udev so that modules
> for your network interfaces still get loaded automatically, while the
> latter doesn't start anything except init and a shell (emergency mode is
> *almost* like init=/bin/sh but in theory might at least let you `systemctl
> start` something).

I was able to get into the emergency target, using these notes:

  https://suay.site/?p=1681&PageSpeed=noscript

The speed bump this article helped me with was to overcome systemd's
misconception that the root account was locked.

- it was not locked; verified with 'passwd -S root'
- root did have a password (known to me)

Anyway, I now am at a more functional command line, and I appreciate
everyone's patience.

> If udev is not running, try to `modprobe` whichever drivers you need for
> the Ethernet interface. (The name can be found by PCI ID, e.g. for
> 10ec:8136 "grep -i 10EC.*8136 /lib/modules/`uname -r`/modules.alias") Then
> manually bring eth0 up, add the IP address, add a default route (dhclient
> or dhcpcd will also work without udev, while systemd-networkd probably
> won't).
> 
> ip link set eth0 up
> ip addr add 192.168.1.55/24 dev eth0
> ip route add default via 192.168.1.1

These, in isolation, are useful notes.  It's been way too many years since
I had to rescue a failing-to-boot Linux server...

> -- 
> Mantas Mikul??nas

-- 
Brian Reichert				<reichert at numachi.com>
BSD admin/developer at large