RE: [Xen-devel] Cloning(making copies) of VMs

["Yu, Ping Y" <ping.y.yu@xxxxxxxxx>]

A very interesting test for save/restore. :-)
As I tested in 7695 without modifying IP address for VM2, I found that 
VM1 and VM2 could be sucessfully restored, and each owns a 
different MAC address, though IP address is the same. 
In that way, maybe we can run "service network restart" to enable network.

>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
>Jacob Gorm Hansen
>Sent: Tuesday, November 08, 2005 3:34 PM
>To: sowmya dayanand
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] Cloning(making copies) of VMs
>
>On 11/8/05, sowmya dayanand <sowmyad@xxxxxxxxx> wrote:
>
>> (VM1 is a virtual machine, with ip addr 10.10.10.1, and we 
>want to clone it
>> as VM2, with ip addr 10.10.10.2) both running on the same 
>physical machine.
>>
>> 1) Save VM1 as VM1_save (using xm save)
>> 2) copy VM1_save to VM2_save
>> 3) Change the vmid and the IP address info in the saved file 
>to that of VM2
>> (Any other information to be changed ?)
>> 4) Restore VM1_save and VM2_save (using xm restore)
>
>The problem is that while you are probably sucessful in telling the
>host environment (xen + linux in domain0) that your cloned VM has IP
>10.10.10.2, the Linux inside VM2 does not know that it is supposed to
>answer the new IP rather than 10.10.10.1, and will just silently drop
>all traffic on 10.10.10.2. It would probably be quite simple (and
>useful, see the Potemkin paper for instance) to have your domain
>answer any incoming IP, or to rewrite all ingoing and outgoing packets
>with a generic address, but you will need to hack either your guest
>Linux or the networking scripts in dom0 to make that happen.
>
>Best,
>Jacob
>
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