Making sure sshd starts even if boot sequence fails (local-fs.target fails).

[Eric Valette <eric.valette@free.fr>]

Hi,

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.

Thanks for any hint.

-- eric