[lxc-users] Btrfs gquota and container disk usage limits

[Serge Hallyn]

Quoting Mark Constable (markc at renta.net):
> On 10/04/15 08:13, Serge Hallyn wrote:
> >>Looks like lxd automatically creates part of the filesystem as a subvolume
> >
> >FWIW, at the moment no lxd does no such thing.  Hopefully soon we'll start
> >exploiting whatever advantages the native fs provides automatically.
> 
> But look at the path in my example, /var/lib/lxd/. It's obviously not the
> rootfs but something in lxd seems to use btrfs for some part of the process.
> 
> >>~ btrfs sub list / | grep lxd
> >>ID 2403 gen 554661 top level 1674 path var/lib/lxd/lxc/v1/rootfs/var/lib/machines
> >>ID 2407 gen 556386 top level 1674 path var/lib/lxd/lxc/v2/rootfs/var/lib/machines

Yes, that's systemd inside your container, which recently started using
btrfs subvolumes for /var/lib/machines.

> >>but I'm not sure how rootfs/var/lib/machines fits into the picture, so no,
> >>I never figured out how to properly set up a lxd container as a subvolume
> 
> Anyway good to hear that lxd will soon start to take advantage of btrfs so
> we can use it's native gquota and hopefully see that reflected inside a
> container via the common df command. This is one case where btrfs subvolume
> quotas suits the situation better than typical per-user quotas in other
> filesystems.
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