WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

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

Ian,

On Mon, 2009-08-24 at 17:05 +0100, Ian Jackson wrote:
> Tim Post writes ("Re: [Xen-devel] Is it possible to access XenStore 
> remotely?"):
> > 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 xenstored can be crashed then we should fix it.  Can you remember
> any of the things which caused it to fall over ?

Mostly, it was run away writers caught in a brain dead loop. It was not
difficult to DoS the store from within a guest accidentally or
deliberately.

I also remember using watches on a single key that changed frequently
without using xs_read_watch() since I already knew what fired, that
caused a total crash of xenstored.

I've also had xs_transaction_end() return -EAGAIN frequently on busy
systems.

The ocaml version of xenstored is much more resilient to abuse, be it
accidental or deliberate.

Cheers,
--Tim


-- 
Monkey + Typewriter = Echoreply ( http://echoreply.us )


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel