I want to (or better have to) do Backups of my KVM Virtual Machine images. I have searched for days for a good Backup Soloution. I know amanda is a very good solution. It would be kinf if someone kenn tell me if the following is supported:

1. Trigger the Creation of LVM Snapshot (by invoking a Shell Script that I will write for that purpose)
2. Do a Differential/Delta Backup on my KVM LVM qcow2 sparse file. => I only want to copy the actually changed bits/bytes (=Delta Backup). And it has to support that the file to be backuped up is a sparse file. (Rsync seems to have some kind of problems in regard to this (if the file does not exist yet on the other side... Then it will create a full file, not a sparse file))
3. Release the LVM Snapshot (By invoking a Script that I will write for that purpose)

It's strange, I have nowhere found any documentation about this fact when searching the internet. Zmanda (Commercial Edition) has support vom XEN VM Backup (but not for KVM as far as I can tell)...

this seems to be a hard problem. I would therefore be very thankfull for your advice. I spend two days trying to get this running, but with no success. (The Public IP Stuff is working, but not the private network)

Goal:

Setting up a "second private network" with KVM on debian squeeze

Infrastructure:

RootServer 1 = Which has multiple VMs
RootServer 2 = Which has multiple VMs
Both Root Servers have a "public" Interface = eth0 (plugged to the internet) and a "private" interface = eth1 (directly plugged into a switch.)
=>I want to communicate in the 10.1.0.0 network only privately with the other boxes...

HOST (/etc/network/interfaces)

auto  eth0
iface eth0 inet static
  address   11.11.11.91
  broadcast 11.11.11.95
  netmask   255.255.255.224
  gateway   11.11.11.65


# Private IP Adress of the HOST
auto eth1
iface eth1 inet static
  address 10.1.1.20
  broadcast 10.1.255.255
  netmask 255.255.0.0
  network 10.1.0.0


## Bridge vor Private Network
auto vbr2
iface vbr2 inet static
       address 10.1.1.21
       netmask 255.255.0.0
       pre-up brctl addbr vbr2
       post-up route add -host 10.1.1.100 vbr2
       post-down brctl delbr vbr2

GUEST: (/etc/network/interfaces)

auto eth0
iface eth0 inet static
  address 11.11.11.87
  netmask 255.255.255.255
  gateway 11.11.11.91
  pointopoint 11.11.11.91



## Private IP Address of the Guest
auto eth1
 iface eth1 inet static
 address 10.1.1.100
 netmask 255.255.255.255
 gateway 10.1.1.20
 pointopoint 10.1.1.20

Problem (starts already here):

If i do a ping 10.1.1.100 on the Host (10.1.1.20/11.11.11.91) I do not get any response from the (10.1.1.100) guest that even resides on the same server. So any internal routing stuff must be wrong... But I was not able to figer this out?

update: I am just wondering. Maybe I need a "Gateway" for the private net. But on the otherhand if I work with bridges, why do I need a gateway for this private network?

Any Hints why this doesnt work are very very appreciated.

Thanky very very much!