Henok Mikre wrote:
This helped me a great deal. Thanks. I just have a few questions...
1) is it best to unmount the /mnt/lvfoo/ before or after kpartx -d? because you have it in your procedure list both before and after kpartx -d.
The /mnt/lvfoo must be unmounted before the kpartx -d, otherwise
it will generate problems on the filesystem of the DomU (because the
kpartx -d deletes partition mappings)
But the line "umount /mnt/lvfoo" after "kpartx -d" is an error due to a
"copy and paste", sorry.
So here are the steps to backup a Domu (filesystem on LVM in backend and
on xvda in frontend) with the dump command from Dom0 (Fedora 8) :
------------------------------------------------------------
# The DomU named "foo" must be stopped before dump
xm shutdown -w foo
# Creates device mapper mappings /dev/mapper/lvfoop[1234] for
/dev/vg00/lvfoo
kpartx -v -a /dev/vg00/lvfoo
# Mounts temporarly the filesystem to backup
mount /dev/mapper/lvfoop1 /mnt/lvfoo/
# Launches the dump
/sbin/dump 0 -L FULL_foo -f /BACKUP-XEN/foo.colddump /mnt/lvfoo/
# Umount the filesystem
umount /mnt/lvfoo/
# Removes the mappings
kpartx -d /dev/vg00/lvfoo
# The DomU can now be restarted
xm create --config /var/lib/xend/....
------------------------------------------------------------
2) is it possible to explore this dump file by either mounting it or some other method?
You can explore the dump file, using the "restore" command like this
restore -if /var/BACKUP-XEN/foo.colddump
You can also restore in another filesystem the filesystem (of the Domu)
that you backuped, following these steps :
lvcreate -L2048 -n lvfoo2 vg00
mkfs.ext3 /dev/vg00/lvfoo2
mkdir /mnt/lvfoo2
mount /dev/vg00/lvfoo2 /mnt/lvvfoo2
cd /mnt/lvfoo2
restore -rf /BACKUP-XEN/foo.colddump
4) is this the best possible method of backing up a domU?
This method works well, but I would be interested in knowing other
methods :-)
Regards
Anne Facq
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