[systemd-devel] early mounts in systemd

[Dave Howorth]

On Fri, 30 Apr 2021 22:08:17 +0200
Michael Biebl <mbiebl at gmail.com> wrote:
> Am Fr., 30. Apr. 2021 um 20:27 Uhr schrieb Rick Winscot
> <rick.winscot at gmail.com>:
> 
> > At this point, flush is attempting to re-route /run/log/journal
> > to /var/log/journal ... and the /var partition is not yet mounted.
> > Units generated for fstab in /run/systemd/generator that manage the
> > mount have an After=local-fs-pre.target which is too late.
> >
> > Other dependency errors appear in the log; all with the same root
> > cause. By the time [ a specified service ] that uses /var is ready,
> > the partition has not yet been mounted. My solution resolves
> > the /var mount as soon as the block device is seen by udev - which
> > made all the dependency errors go away.  
> 
> Fwiw, I can't reproduce the problem. systemd-journal-flush.service is
> correctly started after /var has been mounted.
> In case you are interested, I attached a journalctl dump, /etc/fstab
> and systemd-analyze dump as well.
> As you can see, systemd-journal-flush.service has a proper
> After=var.mount ordering.
> 
> I wonder if you have a dependency loop somewhere and systemd resolves
> this by removing that ordering.

If systemd removes (i.e. doesn't obey) a directive, I'd expect it to be
polite and log that fact somewhere. No?