Making sure sshd starts even if boot sequence fails (local-fs.target fails).
I have a headless nas with a separate system disk installed with debian
unstable and a 5 data disks set with raid10 and a spare disk. Recently
one of my disk broke and the raid10 array did not automatically
reassemble but also the sshd daemon was not started although the boot
was ok but the /dev/md0 mount declared in fstab.
I had to plug a keyboard and a display to enter root passwd and start
sshd. I was surprised sshd was not starting and searched for a way to
force sshd start once network is up.
There is a /lib/systemd/system/rescue-ssh.target but I do not know
when/how it can be activated or how I should modify it.
I could off course use some systemd specific mount options like
x-systemd.device-timeout, noauto or nofail but I would like to know if
there are other options to start sshd even if local-fs.target fails.
Searched in already in documentation but missed it.