On Wed, 2013-10-09 at 09:50 -0500, Serge Hallyn wrote: > > lxc-create -n Ubuntu-test -t ubuntu > > > > Bingo... > > > > /dev/mapper/fedora-root on /usr/lib64/lxc/rootfs type ext4 > > (rw,relatime,seclabel,data=ordered) > > > > Why is lxc-create even creating that mount? I don't see any reason for > > Check lxccontainer.c:785 and line 805. We call bdev_mount() in case its > a blockdev. In the case of a dir-backed container we still end up doing > a bind mount of the rootfs.
I'm not seeing the first of those ERROR calls show up in the output.
The second one is a strange bird...
I never see this one hit:
ERROR("error unsharing mounts");
I DO, however, see this message (assuming it's a unique message that may
not be duplicated in other messages):
ERROR("Error mounting rootfs");
However, that appears to only occur if I tried to create a previous
container under the same name and that failed (and then I have a
dangling mount that seems to generate the failure). I can reproduce
that error by creating a container under a name "Foo" and then
immediately destroying it and then attempting to create a new one with
the same name (without running the umounts first). Then I see that
"Error mounting rootfs" until I run the umount command first.
> > it. We're never running the container in lxc-create. Running
> > "umount /usr/lib64/lxc/rootfs" clears it and we're off to the races
> > again.
> >
> > If I were to venture a WAG (Wild Ass Guess) some initialization code is
> > creating that bind mount that is not needed and that the cleanup code in
> > lxc-create is unaware of. But I haven't gone to the trouble of trying
> > to track the code down yet.
>
> Now is your / still MS_SHARED? The bdev create and templates
> run in a private namespace, but if MS_SHARED then the mounts get
> bounced back to host. Maybe we need to manually set MS_PRIVATE every
> time after doing an unshare() in lxc code.
>
--
Michael H. Warfield (AI4NB) | (770) 985-6132 | m...@wittsend.com
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