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From: Nikos Vassiliadis <nvass@teledomenet.gr>
To: freebsd-questions@freebsd.org,
 hartzell@alerce.com
Date: Fri, 20 Jun 2008 16:58:00 +0300
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Cc: freebsd-isp@freebsd.org, FreeBSD Questions <questions@freebsd.org>
Subject: Re: How do they do their VPS product? [was Re: FreeBSD based web
	hosting?]
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On Thursday 19 June 2008 19:29:35 George Hartzell wrote:
> Is/was there some proprietary virtualization technology in the 4.x
> days?

Not a proprietary one:
http://www.tel.fer.hr/zec/BSD/vimage-old/
&
http://imunes.tel.fer.hr/virtnet/eurobsdcon07_tutorial.pdf
The presentation pdf states:
Anecdotal evidence: FreeBSD 4.11 based version in
  production use by some US ISPs

> Is it still alive and kicking somewhere? 

Hopefully, it will be integrated to HEAD during
summer. You can follow the discussions here: 
http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization

> Anyone have any insights into how these VPS products were built?

Maybe it was that, maybe not...