Xen users - Nov 2005 - any Install howto for FreeBSD as domU with netbsd as dom0?

Is there any other installation howto then the short text file 
http://www.fsmware.com/xenofreebsd/5.3/xenbsdsetup.txt
also then this instructions 
http://lists.xensource.com/archives/html/xen-users/2005-09/msg00187.html ?

What i am looking for is something like a short step by step instruction 
for setup FreeBSD as domU on a NetBSD dom0.

Does only FreeBSD 5.3 work as a domU? What about FreeBSD 6.0? Is xen 
support part of the FreeBSD 6.0 Release?

Should it be possible to setup FreeBSD 6.0 as domU like NetBSD as domU 
the way the howto of NetBSD describes
(http://www.netbsd.org/Ports/xen/howto.html)? Is there a special FreeBSD 
kernel (like freebsd-domU and freebsd-instll)
to create it? Which NetBSD Version/Release to use (-current)?

thanks for information



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On 11/13/05, Rainer Brinkmöller <rainer.brinkmoeller@web.de>
wrote:
>
> Is there any other installation howto then the short text file
> http://www.fsmware.com/xenofreebsd/5.3/xenbsdsetup.txt
> also then this instructions
> http://lists.xensource.com/archives/html/xen-users/2005-09/msg00187.html ?
>
> What i am looking for is something like a short step by step instruction
> for setup FreeBSD as domU on a NetBSD dom0.

The setup is pretty dom0 agnostic. You just need a kernel a root block
device and an appropriate config file.

Does only FreeBSD 5.3 work as a domU? What about FreeBSD 6.0? Is
xen
> support part of the FreeBSD 6.0 Release?

Yes, and only on 2.0.7. Too much has changed in 3.0. Support for 6.0 will be
added after 5.3 is made to work again on 3.0. Eventually xen support will go
into FreeBSD CVS.

Should it be possible to setup FreeBSD 6.0 as domU like NetBSD as
domU
> the way the howto of NetBSD describes
> (http://www.netbsd.org/Ports/xen/howto.html)? Is there a special FreeBSD
> kernel (like freebsd-domU and freebsd-instll)
> to create it? Which NetBSD Version/Release to use (-current)?

See the NetBSD HOWTOs for dom0 setup info.

 -Kip


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On 13/11/05, Rainer Brinkmöller <rainer.brinkmoeller@web.de> wrote:
> (http://www.netbsd.org/Ports/xen/howto.html)? Is there a special FreeBSD
> kernel (like freebsd-domU and freebsd-instll)
I have been trying to build a freebsd53-domu-install image, so far
without much luck. I took the boot.flp from FreeBSD5.3-RELEASE,
mounted it, and took out the mfsroot.gz file, which I unzipped.

I first built a FreeBSD 5.3 kernel using Kip''s instructions, which
managed to spring to life as a DOMU with no issues, both obviously it
wouldn''t boot or do much beyond print device info.

Next, I compiled a new kernel with MD_ROOT_SIZE and MD_ROOT set, and
then used the instructions here:
(http://docs.freebsd.org/cgi/getmsg.cgi?fetch=4169710+0+archive/2005/freebsd-questions/20050327.freebsd-questions)

... to try and embed my mfsroot in to the kernel. This worked fine,
well, the root file went in to the kernel anyway. When booting the
newly create image (using
"vfs.root.mountfrom=ufs:md0,boot_verbose=yes" on the command line) ..
the domain crashes immediately and I get no output. Both my Xen and
FreeBSD knowledge are a bit light at this time, so I didn''t go much
further with this yet.

I also discovered this document:
http://ezine.daemonnews.org/200211/monolithic-kernel.html, describing
how to link a root file system in to a compiled kernel. I read through
the simple patch that modifies sys/md/md.c and a couple of other
things, and it looked easy enough, so I manually applied the patch to
the 5.3 xen kernel source, and followed the instructions. I ended up
with another kernel + root image that looked good, but again it
wouldn''t boot as a domU, and blew up without printing any console
messages (that I could see when I launched it with xm create)

Has anyone else done this already, or am I trying to do something
that''s just not possible?

Regards

Chris

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On 14/11/05, Chris Brookes <cbrookes@gmail.com> wrote:
> Has anyone else done this already, or am I trying to do something
> that''s just not possible?
Well after a bit more experimentation I made some progress. It turns
out that embedding an mfsroot using the write_mfs_in_kernel does
actually work: so long as the mfsroot is less than 1385K. Sadly that''s
not quite enough to get the 2.4MB standard 5.3 install mfsroot going
though. Anyway, at least I''ve seen my FreeBSD guest boot in to
sysinstall for the first time :)

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The way the initial memory space gets setup there is no way MFS could work.
It wasn't an anticipated use. I guess somewhere either in FreeBSD GNATS or
xen's bugzilla there should be i386-xen FreeBSD bugs filed for me to track.

-Kip

On 11/14/05, Chris Brookes <cbrookes@gmail.com>
wrote:
>
> On 13/11/05, Rainer Brinkmöller <rainer.brinkmoeller@web.de> wrote:
>
> > (http://www.netbsd.org/Ports/xen/howto.html)? Is there a special
FreeBSD
> > kernel (like freebsd-domU and freebsd-instll)
>
> I have been trying to build a freebsd53-domu-install image, so far
> without much luck. I took the boot.flp from FreeBSD5.3-RELEASE,
> mounted it, and took out the mfsroot.gz file, which I unzipped.
>
> I first built a FreeBSD 5.3 kernel using Kip's instructions, which
> managed to spring to life as a DOMU with no issues, both obviously it
> wouldn't boot or do much beyond print device info.
>
> Next, I compiled a new kernel with MD_ROOT_SIZE and MD_ROOT set, and
> then used the instructions here:
> (
>
http://docs.freebsd.org/cgi/getmsg.cgi?fetch=4169710+0+archive/2005/freebsd-questions/20050327.freebsd-questions
> )
>
> ... to try and embed my mfsroot in to the kernel. This worked fine,
> well, the root file went in to the kernel anyway. When booting the
> newly create image (using
> "vfs.root.mountfrom=ufs:md0,boot_verbose=yes" on the command
line) ..
> the domain crashes immediately and I get no output. Both my Xen and
> FreeBSD knowledge are a bit light at this time, so I didn't go much
> further with this yet.
>
> I also discovered this document:
> http://ezine.daemonnews.org/200211/monolithic-kernel.html, describing
> how to link a root file system in to a compiled kernel. I read through
> the simple patch that modifies sys/md/md.c and a couple of other
> things, and it looked easy enough, so I manually applied the patch to
> the 5.3 xen kernel source, and followed the instructions. I ended up
> with another kernel + root image that looked good, but again it
> wouldn't boot as a domU, and blew up without printing any console
> messages (that I could see when I launched it with xm create)
>
> Has anyone else done this already, or am I trying to do something
> that's just not possible?
>
> Regards
>
> Chris
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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On Wed, Nov 16, 2005 at 09:30:11AM -0800, Kip Macy
wrote:
> The way the initial memory space gets setup there is no way MFS could work.
> It wasn''t an anticipated use. I guess somewhere either in FreeBSD
GNATS or
> xen''s bugzilla there should be i386-xen FreeBSD bugs filed for me
to track.
> 
> -Kip
> 
I had given this some thought, but not actually tried it yet.

If you just unzip your mfs and treat it as a file backed block device it may 
work. 
(Have a look at the live 2.06 demo CD that has a freebsd.fs file it uses this
way).

However you will run into another problem. sysinstall doesn''t know
about
xbd* or xn*. You will at least need to add then to 
/usr/src/usr.sbin/sysinstall/devices.c and recompile before sysinstall is
usefull under xen.

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