Re: [Xen-users] Re: Access Hypervisor Control from DomU

["Stephen C. Tweedie" <sct@xxxxxxxxxx>]

Hi,

On Fri, 2006-03-31 at 13:59 +0200, Nils Toedtmann wrote:

> > if this would be a problem you would have to deal with in the
> > real world, you would have a identical box on another location and move
> > the domU's to it and reboot the problem box.
> 
> But that is the exact problem: afaik you cannot move domUs or reboot the
> "problem box" remotely if dom0 userland is dead! You are locked. 

Serial console is your friend. :-)

Not only does it give you a ttyS0 login to the dom0 even if networking
is down; it also gives you a reliable way of capturing log information
so you know just how dead the dom0 really is.  And it gives you remote
reboot too: use

^A^A^A

to switch serial console to the hypervisor, and then "R" to reboot the
box.

Also check out ttywatch, a powerful package for sitting on the other end
of a bunch of serial consoles.

Of course, with hosted services you might not be able to set this up;
but if you can, it's well worth the effort.

--Stephen



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