Should machinectl do this?

[Petter Adsen]

On Tue, 14 Apr 2015 12:11:55 -0400
Tom H <tomh0665 at gmail.com> wrote:

> On Mon, Apr 6, 2015 at 10:45 AM, Petter Adsen <petter at synth.no> wrote:
> > On Mon, 6 Apr 2015 10:23:55 -0400 Tom H <tomh0665 at gmail.com> wrote:
> >> On Mon, Apr 6, 2015 at 2:26 AM, Petter Adsen <petter at synth.no>
> >> wrote:
> 
> Sorry. Missed this email.
> 
> 
> >>> If you fire up a VM with machinectl, it mounts the guest
> >>> filesystem on the host through a loopback device. After shutting
> >>> the guest down, also with machinectl, the filesystem is left
> >>> mounted, and the loopback device open.
> >>>
> >>> Shouldn't machinectl clean this up after itself? Is this a bug or
> >>> a feature?
> >>
> >> It's "loop" not "loopback". The latter's a networking term.
> >
> > Sorry :)
> 
> No worries.
> 
> 
> >> What do you mean by mounting "the" guest filesystem through a loop
> >> device?
> >
> > root at monster:~# machinectl start fedora
> > root at monster:~# machinectl list
> > MACHINE CLASS     SERVICE
> > fedora  container nspawn
> >
> > 1 machines listed.
> > root at monster:~# df
> > <snip>
> > /dev/loop0p1                  ext4      2,9G  348M  2,4G
> > 13% /media/petter/c3dbe26e-e200-496e-af8e-d3071afe1a29
> > <snip>
> > root at monster:~#
> > ls /media/petter/c3dbe26e-e200-496e-af8e-d3071afe1a29/ bin   dev
> > home  lib64       media  opt   root  sbin  sys  usr boot  etc
> > lib   lost+found  mnt    proc  run   srv   tmp  var
> >>
> >> Do you mean that you're bind-mounting a host directory in the
> >> guest?
> >
> > I only start the guest. I'm not bind-mounting anything. machinectl
> > does this by itself.
> >>
> >> What commands are you running to start and stop the container?
> >
> > See above, plus:
> > root at monster:~# machinectl poweroff fedora
> > root at monster:~# machinectl list
> > MACHINE CLASS SERVICE
> >
> > 0 machines listed.
> > root at monster:~# df
> > /dev/loop0p1                  ext4      2,9G  348M  2,4G
> > 13% /media/petter/c3dbe26e-e200-496e-af8e-d3071afe1a29
> >
> > So, my question basically is, since machinectl mounts this,
> > shouldn't it unmount when the guest is shut down? If I start the
> > guest again, it mounts the image a second time.
> >
> > Maybe I'm just confused here, it just seems to me that machinectl
> > should clean up when it does a clean shutdown, which is what
> > "poweroff" is said to be in the man page.
> 
> I don't have this mount when I use machinectl.

Strange. I should have been clear about this earlier, but I'm using
15.04. I haven't hacked 14.10 to run with systemd :) That's the main
reason I thought this was something that should be cleaned up before
release.

> Do you have it when you use systemd-nspawn?

Yes.

Petter

-- 
"I'm ionized"
"Are you sure?"
"I'm positive."
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