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Holger Parplies wrote:
> Hi,
>
> Nils Breunese (Lemonbit) wrote on 2008-12-08 12:23:40 +0100 [Re:
> [BackupPC-users] Advice on creating duplicate backup server]:
>> Stuart Luscombe wrote:
>>
>>> I?ve got the OS (CentOS) installed on the new server and have
>>> installed BackupPC v3.1.0, but I?m having problems working out how
>>> to sync the pool with the main backup server.
>
> I can't help you with *keeping* the pools in sync (other than recommending to
How about my personal favourite - enbd or nbd.... I've had success using
this to mirror a fileserver with it's "hot standby" partner... Simply
setup all your drives as needed in your "master", format, use as needed
(as you already have), then setup your drives in your slave (ie,
raid1/5/6/etc) but don't format them. Then setup nbd/enbd (very simple,
run one command on the slave and one on the master). Now, the tricky
part, follow carefully:
1) umount the drive on the master.
2) create a raid1 array on the master with one device being your
filesystem you unmounted in (1) and the second device "missing"
3) hot-add the device from nbd (/dev/nbd/0) to your new raid1 array
4) Use mdadm to configure the device in (3) as a write-mostly or
write-only if possible.
Now you have a real-time mirror on a remote machine. If everything goes
pear-shaped, you do something like this:
1) Make sure the master is dead...
2) kill nbd on the slave
3) mount the device you used for nbd as /var/lib/backuppc
4) start backuppc on the slave
(PS, this assumes you have some method of sync'ing the other system
configs between the two machines (hint - rsync)...
You may need to experiment a bit, but perhaps LVM + snapshots might help
as well
Of course, the simplest method to ensure off-site and up to date backups
is to simple run a second independant backuppc server, assuming you have
enough time + bandwidth...
Hope that helps...
Regards,
Adam
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