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From: Vivek Khera <vivek@khera.org>
Date: Mon, 12 Mar 2007 17:03:24 -0400
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Subject: Re: Xen Dom0, are we making progress?
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On Mar 12, 2007, at 4:34 PM, Nikolas Britton wrote:

> What I'd really love to do is split up each service (httpd, postgres,
> samba/nfs,  ldap/nis, asterisk, etc.) into discrete virtual machines.
> It's too much work trying to make them all play nice on one system,

This is the purpose for which we (ab)use jails for too.  Works great,  
less filling.

Check out ezjail in the ports; it makes very lightweight jails by  
using nullfs to share the full install tree across multiple jails.   
This may not be what you want, but it is what I wanted.

What you don't get is a private kernel per jail, and some services  
are not really virtualized like network, and SYSV IPC.  And you can  
only assign one IP per jail.

For what I need, Xen is overkill.