Subject: Re: FreeBSD-like jail? And virtual hosting management interface?
To: NetBSD User's Discussion List <netbsd-users@NetBSD.ORG>
From: Roberto Pereyra <email@example.com>
Date: 11/09/2004 07:55:33
Hi all !
Where I can find a Xen-NetBSD virtual hosting howto ?
Thanks in advance.
On Mon, Nov 08, 2004 at 01:18:32PM -0500, Greg A. Woods wrote:
> [ On Sunday, November 7, 2004 at 16:47:06 (-0500), Steven M. Bellovin wrote: ]
> > Subject: Re: FreeBSD-like jail? And virtual hosting management interface?
> > Xen is great for heavy-weight confinement, but it takes a lot of effort
> > -- you have to build (and maintain) an entire extra NetBSD image for
> > each such app.
> I don't agree about the amount of effort it takes -- indeed from what
> little I've seen, both with Xen and with other VM systems across the
> years, it takes _far_ less effort to set up and use a full virtual
> machine environment than it does to set up and use a "chroot" or "jail"
> style environment.
> With Xen you don't actually have to build and maintain an extra NetBSD
> image for each vitual environment, just one for them all -- there are
> several techniques to share all the common elements and with Xen in
> particular if I'm not mistaken I believe the scripting possible during
> VM cloning can take care of all the critial configuration differences
> between VMs (leaving the rest up to the users who the VMs are assigned
> The setup of "jail" environments can obviously be scripted too, but in
> the end you pretty much have to create whole OS images for each env too.
> However a full VM is indeed a heavy-weight confinement tool -- you do
> indeed have to run a full kernel and user-land in each virtual machine
> and the VM itself can only do so much to share various resources under
> the hood.
> Greg A. Woods
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