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Re: [Xen-users] DNS servers as guests?

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] DNS servers as guests?
From: Geert Janssens <info@xxxxxxxxxxxx>
Date: Thu, 26 Feb 2009 18:03:30 +0100
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(Sorry Mike, my mail was intended for the list and more specifically the 
original poster, but you got it by accident). So here it is again on the list.

I don't have this setup, but if I were you, I would test via another tool as 
well, just to see the slowness is not in part due to Firefox as well.

Try the dig command for example (if you have a linux client). You could even 
add a time command in front of it to get a more precise idea of how long the 
command took, like 'time dig <yourdomain>'

With dig you can also do more detailed tests, to verify if it is really your 
DNS server doing the resolution.



On Thursday 26 February 2009, lists@xxxxxxxxxxxx wrote:
> > I have a couple of Fedora Core 4 guests (3 GB disk, 256 MB RAM, 512 MB
> > swap) on Fedora Core 4 dom0 + Xen 3.0.4 running bind 9.3.1 with about 500
> > zones each.
> Your guest setup is pretty much the same as the one I just built. I only
> have about 50 zones on this one but these are internal domains. The DNS
> servers act as outgoing for local clients. 
> > I'm not sure what you mean exactly with slow, but assuming you mean slow
> > responses to DNS queries, I don't have problems with them.
> I'm not sure that I should call it 'slow' but it's not as 'fast' as my
> stand alone's are, by a second or two perhaps.
> >Though, I don't
> > have concrete info about bind performance and all that stuff, since these
> > aren't our primary DNS servers but only serve zones of some specific
> > domains.
> I have a DNS measurement tool somewhere. The only reason I'm asking is
> because I want to be careful that I don't virtualize too much. If
> everything is even a tiny bit slower, then the overall will show up as
> sluggish services.
> Mike
> _______________________________________________
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