Re: systemd, fstab, noauto and nofail

[Matthias Klumpp <matthias@tenstral.net>]

2014-11-22 20:30 GMT+01:00 Russ Allbery <rra@debian.org>:
> Jonas Smedegaard <dr@jones.dk> writes:
>> Quoting Russ Allbery (2014-11-22 18:01:12)
>
>>> I also like the idea of not having ssh depend on all local file systems
>>> to be mounted.  I think it's going to be pretty rare to have a system
>>> that has /lib and /etc mounted but can't start ssh.  In theory, that's
>>> possible with a split / and /usr, but as we've discussed in other
>>> threads, that's an extremely unusual configuration these days.
>
>> It surprises me that it is considered "extremely unusual": It is an
>> option offered in stable debian-installer without any advanced trickery
>> (just select LVM and pick the last option) - I quite commonly use that,
>> and would be surprised if I am alone in that.
>
> Sorry, I didn't express that very well.  I know that people do partition /
> and /usr separately; what I was going to say and then didn't is that the
> *error* case is extremely unusual.  In other words, if you can mount /,
> you're probably going to be able to mount /usr, because it's generally on
> the same disk.
>
> What's extremely unusual is a local / and a network-mounted /usr, or other
> sorts of split situations where it's at all likely that mounting / would
> succeed but mounting /usr would fail.
>
> The question, though, is can we express this requirement properly?  We do
> need to make sure that /usr is mounted before ssh is started, but we don't
> really want to wait for mounting all the random other file systems that
> someone might have.
I did that once by just creating a ConditionFileExists on a file in
/usr. It's a pretty dumb workaround, but it worked...
(Maybe systemd has smarter methods for that case which I don't know of)