> -----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[1]; it's not a bug, it's not a gLite specific
matter,
and it's well doucumented, e.g. in the Xen FAQ, which also points out
that
if you do this, Xen gives you "A large warning message":
http://wiki.xensource.com/xenwiki/XenFaq#head-31ebe1eb6c34c5d4044559364d
1048bf8ea1cae7
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
issue
part of SL/CentOS/RHEL 5, which has got to be an easier sell than
getting
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
horrified
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
(currently)
VMware server. It's nice, but the management interface in the FOC server
is all
pointy clicky friendly, but I wouldn't want to run more than handful of
systems
with it. There is a perl scripting API, but I've not looked at it at
all.
Ewan
[1] The separate TLS glibc is gone in more recent Linux systems, those
seem to run
on top of Xen without modification.
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