RE: [Openvds-devel] jail

[Esparza, Dan]

Usermode linux is just that -- it's a 'usermode' kernel that you can use
to boot up several instances of the kernel.  It has some limitations and
is (understandably) processor bound -- but it's pretty slick for what it
does.

Dan

> -----Original Message-----
> From: Andres L. Figari [mailto:address@hidden 
> Sent: Thursday, January 10, 2002 8:40 AM
> To: address@hidden
> Subject: Re: [Openvds-devel] jail
> 
> 
> Dave,
> 
> Thanks for this, makes it more clear.
> 
> I use sphera and honestly, it sucks.  I can't begin to tell 
> you how much I
> hate it.  Anyways, I thought that maybe having an OS inside 
> an OS would
> provide people great flexibility by making it so that 
> "anything" can be
> installed in to the virtual environment.  Unlike Sphera where 
> if you try to
> alter the sednmail configuration you can't.  If you tryy to 
> add modules it's
> a pain.  I just want a virtual server to be just that, not a 
> limited watered
> down version with no real power.  With Sphera you get what it 
> is or hit the
> road.
> 
> What stimulated me about this jail thiung was just that.  You get a
> realistic OS.  With root and everything.  Do you mind if I 
> ask you another
> question?  What about user mode linux?  That's more like jail right?
> 
> I obviously need to study freeVSD/openVDS more and how this differs :)
> 
> Andres
> 
> ----- Original Message -----
> From: "Dave Cost" <address@hidden>
> To: <address@hidden>
> Sent: Thursday, January 10, 2002 9:04 AM
> Subject: RE: [Openvds-devel] jail
> 
> 
> > Andres,
> >
> > Sure I've heard of jail and I'm also using it on production 
> servers (even
> if
> > I'm moving everything over to openvds).
> >
> > Jail is a slightly more automated chroot.
> >
> > The jail function will recreate an environment the same way 
> you could copy
> > the shared libraries under linux and then chroot there. I 
> recall there
> were
> > some slight differences at the kernel level, but that is 
> what jail is all
> > about.
> >
> > OpenVDS/FreeVSD are somewhat more elaborate. You have a daemon that
> > understands what's going on. You have virtuald that knows 
> what processes
> to
> > start so you don't need to have them running all the time. You have
> > authentication and security and distributed control over 
> several physical
> > servers if you whish.
> >
> >  If we speak commercial (sphera, ensim) I can tell you that 
> sphera is very
> > close to what OpenVDS should have been one year ago if 
> idaya didn't stop
> > supporting it. Sphera even provides a name-based VDS which 
> is something we
> > cannot have ...yet. Sphera lacks the support of more domain 
> names per
> > virtual server but they're working on it.
> >
> > On the other hand the jail function of xxxBSD has been the 
> same for a lot
> of
> > time and there seems to be no development in progress. Some 
> ISP have used
> it
> > commercially, but I have not heard of a real 
> commercial/opensource product
> > like OpenVDS and Sphera and Ensim are. The FreeBSD is more 
> do-it-yourself,
> > altough rock solid and ... its still BDS. It's not linux and even if
> > source-code compatibility exists, you'll find that packages 
> still need
> some
> > porting to work there.
> >
> > So, to answer your question. We're not reinventing the 
> wheel.... we're
> > talking of engines here ;-)) ....
> >
> > Dave.
> >
> >
> > _______________________________________________
> > Openvds-devel mailing list
> > address@hidden
> > http://mail.freesoftware.fsf.org/mailman/listinfo/openvds-devel
> 
> 
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