Upcoming btrfs autosnap feature might help your problem-solution.
But the main part in your case which is to replace the root
with its snapshot is something beyond the scope of autosnap
project.
What is being developed is a set of btrfs-prog sub-command to
create and manage snapshots with a rule-set. Code is under
development, if you would like to test and provide feedback
I can send you a copy this week.
OR if you want to just know the new feature relevant to you
its as below (not a complete features list though).
- Create snapshot automatically based on
- AD-hoc (package-installation/boot ..etc)
cli eg:
# btrfs autosnap enable <tag> <retain-policy> <subvol>
and the cli that a init or package script should call is
# btrfs autosnap now -t <tag> /btrfs
which will create a snapshot and reviews its retention policy.
retention policy can be based on count, based on FS % full, OR
manually maintained snapshots.
If you have any feedback pls let me know.
thanks, Anand
On Monday 09,January,2012 02:43 PM, bt...@spiritvideo.com wrote:
Hi all --
I just installed my first btrfs-based linux tonight, and I must say it
gives me a very warm feeling! Congratulations on all your hard work
and your fine product.
I administer laptops for a small school, and we want to implement what
Deep Freeze (http://www.faronics.com/enterprise/deep-freeze) does for
Windows -- no matter what a student does after they log in, when they
reboot it is all forgotten and the computer has returned to a standard
state.
I would think this would be a FAQ, but I have searched the web and
mailing list for the past couple of hours.
Of course it's easy to mount a snapshot, but then if students make
changes the snapshot changes.
The plan that occurs to me is to make a snapshot of the system in the
state that I want to always boot. Then, I would rewrite the init
script in the initrd to (a) delete any old tmp copy of the snapshot;
(b) copy the static snapshot to a tmp copy; (c) mount the tmp copy.
That's a little harder than I was hoping to work -- is there an easier
way to get this functionality?
I have a small ext4 boot partition containing grub, vmlinuz and
initramfs. Everything else is in a big btrfs root partition. I am
running Fedora 14, with Fedora-patched linux 2.6.35. I could upgrade
if necessary.
Thanks,
Bob
--
I blog about my work at the school at SmallSchoolIT.wordpress.com
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