This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Is it possible to access XenStore remotely?


On Thu, 2009-08-20 at 10:00 -0400, weiming wrote:
> Hi VIncent,
> Yes, I'm considering adding a TCP socket for xenstored. 
> Since xen apis can be called remotely, there's no reason to prevent
> accessing xenstore in the same way.

We did this when working on an experiment to use Xen on a single system
image. Our implementation utilized a private back-end LAN which was not
exposed to dom-u's that faced the public, so no authentication mechanism
was needed. We needed to set up remote watches to facilitate a sort of
'cluster wide upstart for xen'. 

I would warn you, XenStore is fragile and often fickle, I've crashed it
many times within a guest while working on split drivers for various
character devices.

If you expose it via sockets, without having the API as a buffer to take
most 'brute force' abuse, be sure to code very defensively and utilize
iptables to restrict access. While xend can be re-started , xenstored
can not.

Yes, API's can be called remotely, however some diligence prevails
before the API actually talks to xenstore.


> thanks,
> Weiming
> On Thu, Aug 20, 2009 at 5:24 AM, Vincent Hanquez
> <vincent.hanquez@xxxxxxxxxxxxx> wrote:
>         weiming wrote:
>                 Hi,
>                 Is it possible to read/write the xenstore from another
>                 physical machine?
>                 I know it uses Unix socket. So it looks hard to access
>                 it remotely, isn't it?
>         Hi weiming,
>         whilst it's not possible at the moment and certainly a bad
>         idea security wise, make xenstored listen on a tcp socket
>         along with the unix socket is very easy.
>         cheers,
>         --
>         Vincent
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
Monkey + Typewriter = Echoreply ( http://echoreply.us )

Xen-devel mailing list