Re: [Xen-users] what protocol is used for migration

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Anthony.Golia@xxxxxxxxxxxxxxxxx wrote:

> thx.  one can migrate stateless (diskless) domUs that have their storage
> on NFS and no SAN.  forgot about VPNs like ssh tunnel, etc.  if the
> migration protocol uses one or two UDP or TCP ports it would lend itself
> well to that, thx a lot.
>  
The problem with using a tunnel is that without appropriate throttling 
you'll eat up a lot of CPU since you're copying a lot of data over the wire.
The protocol is very simplistic btw, pages (with their addresses) are 
sent over the wire and then finalized by transfering the configuration 
over.  There are no protections against any sort of man-in-the-middle 
either so it's quite trivial to inject random badness into vms as 
they're migrated.
There is no authorization either for instantiating virtual machine 
migrations.  If you've got got relocation enable, you should have it 
bound to a secure and isolated physical lan.  Otherwise, you've got a 
security nightmare...
Regards,

Anthony Liguori

> On Mon, 23 Jan 2006, Ralph Passgang wrote:
>
>  
>
> > Am Montag, 23. Januar 2006 23:01 schrieb Anthony.Golia@xxxxxxxxxxxxxxxxx:
> >    
> >
> > > hi.  is there a whitepaper that talks about the details of copying the VM
> > > image across the network.  i.e. is that encrypted in any way?
> > >      
> > I don't know if there is a whitepaper available, but for what I can say the
> > transfer is unencrypted at all.
> >
> > I think that is not really a problem, because if you want to migrate vm's you
> > have to use a san anyway. On a migration only the memory and some states will
> > be send over network. If you use a seperated network for the network attached
> > storage (san), then you can also safely migrate domainUs over the san network
> > without using the "wan" interface of your xen host. You can firewall the
> > migration ports on the wan side or just letting xend bind to the san network
> > interface.
> >
> > Migration domUs over long distance will not work (because you need the current
> > disk data on the other side too and because of the arp/mac-takeover (so you
> > your destination host has to be in the same layer2 network)). I think there
> > is no need for encryption, but if you really need it, why not using a vpn
> > (for example openvpn) for securing network traffic between the both xen
> > hosts? Or in a layer 2 network (what you need to do this anyway) use a
> > dedicated vlan or something like that. There are many possibilities for
> > securing network traffic, xen really doesn't need to take care of your
> > network security (at least in my humble opinion).
> >
> >    
> >
> > > Cheers,
> > > Anthony
> > >      
> > --Ralph
> >
> >    
> >
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> >
> >    
>
>
>
> Cheers,
> Anthony
>
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>  

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