> -----Original Message-----
> From: Testbed Support for GridPP member institutes
> In Jan 2008 there was this in rollout about problems with WN
> on Xen VM:
> > Xen is not able to cope with tls libraries. So I suggest you to not
> > install UI/WN inside a xen virtual machine.
> As Xen & LCG mware are both moving targets, that may be fixed
> (or not) by now.
I've just had a look back at that thread and as far as I can see it's a
total non-issue; Xen paravirtualised guests can never run with the TLS
version of glibc in them; it's not a bug, it's not a gLite specific
and it's well doucumented, e.g. in the Xen FAQ, which also points out
if you do this, Xen gives you "A large warning message":
So; in short, it seems that the person having the problem set up their
guest in a way that would be broken regardless of what they used it for,
used it for gLite, and got a broken gLite. I wouldn't worry about it,
just don't do the same thing.
> On next stage of Bristol HPC we may need to try WN in VM - probably
> not Xen - since the HPC WN won't run SL4; possibly run SL5 or some
> other OS.
I'd have thought Xen would be the obvious candidate; it's a standard
part of SL/CentOS/RHEL 5, which has got to be an easier sell than
something else installed?
> Does anyone know the current state of compat for LCG WN VM?
> Is it know that it won't work with (ie) VMWare, or whateve
> other VM software?
I've not tried the worker node, but I would be stunned, amazed and
if it managed to do anything that wouldn't work in any reasonable VM.
> Or are sites successfully running WN as VM &, if so, what VM software
> are you using? Any problems?
We've got a torque master, a bdii and a couple of CEs running under
VMware server. It's nice, but the management interface in the FOC server
pointy clicky friendly, but I wouldn't want to run more than handful of
with it. There is a perl scripting API, but I've not looked at it at
 The separate TLS glibc is gone in more recent Linux systems, those
seem to run
on top of Xen without modification.