----- Original Message -----
From: "Chris Murphy" <lists(a)colorremedies.com>
To: "Hubert Kario" <hkario(a)redhat.com>
Cc: security(a)lists.fedoraproject.org
Sent: Thursday, 13 February, 2014 5:58:45 PM
Subject: Re: btrfs snapshots, rollbacks
On Feb 13, 2014, at 9:27 AM, Hubert Kario <hkario(a)redhat.com> wrote:
>
>>> The logs are a different matter, we should aim to preserve them. Dunno
>>> where
>>> journald is in this picture (binary log forward and backward
>>> compatibility).
>>
>> If by preserve you mean a single contiguous log location, then that
>> implies
>> needing a subvolume for logs. For example:
>>
>>
http://lists.freedesktop.org/archives/systemd-devel/2014-January/016253.html
>>
>> I have implemented this and it appears to work, although probably it
>> should
>> be a log subvolume mounted at /var/log so that all logs can be kept
>> contiguous, not just the journal.
>
> Yes, that's what I was thinking about.
>
> If we're going to support update rollback through snapshots I think that
> /var/log should be kept separate in default install.
I don't know where Fedora is at with Btrfs by default, let alone how the
Workstation PRD envisions implementing "Better upgrade/rollback control" or
how any other Fedora product considers such functionality should work. There
is this:
http://fedoraproject.org/wiki/Changes/Rollback
But that only mentions LVM thin provisioning. Not Btrfs.
Yet the same concern with logs applies to LVM snapshotting and rollback. So
if /var/log should be kept separate in a default install then it sounds like
you'd support an RFE for anaconda that calls for automatic partitioning
creating a log subvolume/LV to be mounted at /var/log. True?
yes
I think the rule would be something like "if rootfs is on Btrfs
or a virtual
LV, then automatically create a "log" subvolume/LV and mount it at
/var/log". Ack/nack/patch?
Sounds reasonable
--
Regards,
Hubert Kario
Quality Engineer, QE BaseOS Security team
http://wiki.brq.redhat.com/hkario
Email: hkario(a)redhat.com
Web:
www.cz.redhat.com
Red Hat Czech s.r.o., Purkyňova 99/71, 612 45, Brno, Czech Republic