pxe support

pxe support

[Sven Oehme]

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Hi, 

i saw a bunch of patches from Anthony adding pxe support to qemu. will 
that end in xen at some point , or is it already in ? 
i searched in the archives and also the source but couldn't find anything 
..

Sven

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Re: pxe support

[Anthony Liguori]

Sven Oehme wrote:
>
> Hi,
>
> i saw a bunch of patches from Anthony adding pxe support to qemu. will 
> that end in xen at some point , or is it already in ?
> i searched in the archives and also the source but couldn't find 
> anything ..

It should be there.  The QEMU patches were inspired by Tim's Xen 
patches.  I've seen a few commits that have disabled/enabled Option ROM 
loading which would prevent the etherboot ROM from getting loaded.

Should PXE booting work ATM Tim?

Regards,

Anthony Liguori

> Sven
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>   

Re: pxe support

[Tim Deegan]

At 13:15 -0600 on 17 Jan (1169039714), Anthony Liguori wrote:
> Sven Oehme wrote:
> >
> >Hi,
> >
> >i saw a bunch of patches from Anthony adding pxe support to qemu. will 
> >that end in xen at some point , or is it already in ?
> >i searched in the archives and also the source but couldn't find 
> >anything ..
> 
> It should be there.  The QEMU patches were inspired by Tim's Xen 
> patches.  I've seen a few commits that have disabled/enabled Option ROM 
> loading which would prevent the etherboot ROM from getting loaded.
> 
> Should PXE booting work ATM Tim?

Works for me in -unstable.   Give the guest a vif, and choose boot=n.

Cheers,

Tim.

Re: pxe support

[Sven Oehme]

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Hi Tim,

that's my config : 

name = "fc7-pxe"
memory = "256"
disk = [ 'phy:vg01/fc7-pxe,xvda,w', ]
vif = [ 'mac=66:22:aa:77:aa:89, bridge=xenbr0', ]
vnc=1
uuid = "57caa792-1234-773c-69a3-f1e0269d8618"
on_reboot   = 'restart'
on_crash    = 'restart'
boot='n'

when i start it : 

xm create /etc/xen/fc7-pxe -c
Using config file "/etc/xen/fc7-pxe".
Error: No kernel specified

so what am i doing wrong ?
i am using xen-unstable from yesterday 

thanks. Sven

xen-devel-bounces@lists.xensource.com wrote on 01/18/2007 10:01:44 AM:

> At 13:15 -0600 on 17 Jan (1169039714), Anthony Liguori wrote:
> > Sven Oehme wrote:
> > >
> > >Hi,
> > >
> > >i saw a bunch of patches from Anthony adding pxe support to qemu. 
will 
> > >that end in xen at some point , or is it already in ?
> > >i searched in the archives and also the source but couldn't find 
> > >anything ..
> > 
> > It should be there.  The QEMU patches were inspired by Tim's Xen 
> > patches.  I've seen a few commits that have disabled/enabled Option 
ROM 
> > loading which would prevent the etherboot ROM from getting loaded.
> > 
> > Should PXE booting work ATM Tim?
> 
> Works for me in -unstable.   Give the guest a vif, and choose boot=n.
> 
> Cheers,
> 
> Tim.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

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Re: pxe support

[Tim Deegan]

At 10:22 +0100 on 18 Jan (1169115756), Sven Oehme wrote:
> name = "fc7-pxe"
> memory = "256"
> disk = [ 'phy:vg01/fc7-pxe,xvda,w', ]
> vif = [ 'mac=66:22:aa:77:aa:89, bridge=xenbr0', ]
> vnc=1
> uuid = "57caa792-1234-773c-69a3-f1e0269d8618"
> on_reboot   = 'restart'
> on_crash    = 'restart'
> boot='n'
> 
> when i start it : 
> 
> xm create /etc/xen/fc7-pxe -c
> Using config file "/etc/xen/fc7-pxe".
> Error: No kernel specified
> 
> so what am i doing wrong ?
> i am using xen-unstable from yesterday 

The guest needs to be a HVM guest -- look at /etc/xen/xmexample.hvm.
Off the top of my head, you are missing these two lines:

builder = 'hvm'
kernel = '/usr/lib/xen/boot/hvmloader'

Cheers,

Tim.

Re: pxe support

[Sven Oehme]

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ok, that explains why it is not working with my PV guest.
are there plans to add this function to PV guests as well , i think here 
is the most value ... and by the way where i need it :-)

Sven Oehme 



Tim Deegan <Tim.Deegan@xensource.com> 
01/18/07 10:35 AM

To
Sven Oehme/Germany/IBM@IBMDE
cc
Tim Deegan <Tim.Deegan@xensource.com>, Anthony Liguori 
<aliguori@linux.vnet.ibm.com>, xen-devel@lists.xensource.com
Subject
Re: [Xen-devel] pxe support






At 10:22 +0100 on 18 Jan (1169115756), Sven Oehme wrote:
> name = "fc7-pxe"
> memory = "256"
> disk = [ 'phy:vg01/fc7-pxe,xvda,w', ]
> vif = [ 'mac=66:22:aa:77:aa:89, bridge=xenbr0', ]
> vnc=1
> uuid = "57caa792-1234-773c-69a3-f1e0269d8618"
> on_reboot   = 'restart'
> on_crash    = 'restart'
> boot='n'
> 
> when i start it : 
> 
> xm create /etc/xen/fc7-pxe -c
> Using config file "/etc/xen/fc7-pxe".
> Error: No kernel specified
> 
> so what am i doing wrong ?
> i am using xen-unstable from yesterday 

The guest needs to be a HVM guest -- look at /etc/xen/xmexample.hvm.
Off the top of my head, you are missing these two lines:

builder = 'hvm'
kernel = '/usr/lib/xen/boot/hvmloader'

Cheers,

Tim.


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Re: pxe support

[Tim Deegan]

At 10:38 +0100 on 18 Jan (1169116728), Sven Oehme wrote:
> ok, that explains why it is not working with my PV guest.
> are there plans to add this function to PV guests as well 

I don't know if anyone is working on it.  It shouldn't be too hard to
put together some DHCP and TFTP clients to fake it out.  
Jacob Gorm Hansen's got a project to do some in-domain bootloading for
PV guests, which might do what you need:
http://lists.xensource.com/archives/html/xen-devel/2007-01/msg00134.html

Cheers,

Tim.

Re: pxe support

[Sven Oehme]

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thanks for the info, i will have a look at least from the posting it looks 
like what i am looking for ..

Sven



Tim Deegan <Tim.Deegan@xensource.com> 
01/18/07 11:01 AM

To
Sven Oehme/Germany/IBM@IBMDE
cc
Anthony Liguori <aliguori@linux.vnet.ibm.com>, 
xen-devel@lists.xensource.com
Subject
Re: [Xen-devel] pxe support






At 10:38 +0100 on 18 Jan (1169116728), Sven Oehme wrote:
> ok, that explains why it is not working with my PV guest.
> are there plans to add this function to PV guests as well 

I don't know if anyone is working on it.  It shouldn't be too hard to
put together some DHCP and TFTP clients to fake it out. 
Jacob Gorm Hansen's got a project to do some in-domain bootloading for
PV guests, which might do what you need:
http://lists.xensource.com/archives/html/xen-devel/2007-01/msg00134.html

Cheers,

Tim.



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RE: pxe support

[Ian Pratt]

> At 10:38 +0100 on 18 Jan (1169116728), Sven Oehme wrote:
> > ok, that explains why it is not working with my PV guest.
> > are there plans to add this function to PV guests as well
> 
> I don't know if anyone is working on it.  It shouldn't be too hard to
> put together some DHCP and TFTP clients to fake it out.
> Jacob Gorm Hansen's got a project to do some in-domain bootloading for
> PV guests, which might do what you need:
>
http://lists.xensource.com/archives/html/xen-devel/2007-01/msg00134.html

There's also Gerd's domU kexec work.

I'd really like to see domU PV PXE boot support to complement the HVM
support. The easiest way might just be to hack something together in
dom0, though. 'tftpc' can be used to fetch the kernels. The easiest dhcp
client to use is probably udhcp. I'd probably hack it to take a MAC
address on the command line, and then exit after getting a response (or
timing out). We should be able to run udhcp against the guests's vif, or
possibly the bridge its connected to.

It would be excellent if someone could work on this and try and get a
patch into 3.0.5.

Thanks,
Ian  

Re: pxe support

[Gerd Hoffmann]

> There's also Gerd's domU kexec work.

Kind of "on hold" right now due to being sidetracked with 32-on-64
stuff, hope I can come back to this soon.  Should be easy to get pxe
work I think.  The mini bootloader already can bring up the interface
using dhcp, it doesn't do anything useful with it yet though, I did this
more for network device handover testing.  Fetching a kernel using tftpc
is easy to add.

cheers,
  Gerd

Re: pxe support

[Gerd Hoffmann]

Ian Pratt wrote:

> There's also Gerd's domU kexec work.

If you want to have something to play with:

http://www.suse.de/~kraxel/kexec/README.vmlinuz-xen-kboot
http://www.suse.de/~kraxel/kexec/vmlinuz-xen-kboot.32

  [ the pae/64 kernels are not updated yet and
    can boot from the virtual disk only ]

Put this into the xen config file:

   kernel="/path/to/vmlinuz-xen-kboot.32"
   extra="kernel=tftp:vmlinuz-xen"

extra="kernel=http://host/path/file" works too.

cheers,
  Gerd

Re: pxe support

[Sven Oehme]

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i have a pae system, so have to wait until you updated them :-)

Sven



Gerd Hoffmann <kraxel@novell.com> 
01/24/07 04:53 PM

To
Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
cc
Tim Deegan <Tim.Deegan@xensource.com>, Sven Oehme/Germany/IBM@IBMDE, 
Anthony Liguori <aliguori@linux.vnet.ibm.com>, 
xen-devel@lists.xensource.com, ian.pratt@cl.cam.ac.uk
Subject
Re: [Xen-devel] pxe support






Ian Pratt wrote:

> There's also Gerd's domU kexec work.

If you want to have something to play with:

http://www.suse.de/~kraxel/kexec/README.vmlinuz-xen-kboot
http://www.suse.de/~kraxel/kexec/vmlinuz-xen-kboot.32

  [ the pae/64 kernels are not updated yet and
    can boot from the virtual disk only ]

Put this into the xen config file:

   kernel="/path/to/vmlinuz-xen-kboot.32"
   extra="kernel=tftp:vmlinuz-xen"

extra="kernel=http://host/path/file" works too.

cheers,
  Gerd



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Re: pxe support

[Christoph Egger]

On Thursday 18 January 2007 10:01, Tim Deegan wrote:
> At 13:15 -0600 on 17 Jan (1169039714), Anthony Liguori wrote:
> > Sven Oehme wrote:
> > >Hi,
> > >
> > >i saw a bunch of patches from Anthony adding pxe support to qemu. will
> > >that end in xen at some point , or is it already in ?
> > >i searched in the archives and also the source but couldn't find
> > >anything ..
> >
> > It should be there.  The QEMU patches were inspired by Tim's Xen
> > patches.  I've seen a few commits that have disabled/enabled Option ROM
> > loading which would prevent the etherboot ROM from getting loaded.
> >
> > Should PXE booting work ATM Tim?
>
> Works for me in -unstable.   Give the guest a vif, and choose boot=n.

There's no explicit PXE support needed in Xen. All what you need is a
bootmanager, which passes a multiboot header to Xen. That's all.

PXE bootmanagers which support multiboot are PXELinux and PXEGrub
(I'm aware of these two. I don't know if there are more.).
Both work fine for me. I use them regularly for development/testing.

It makes more fun to build a kernel and boot it from network. It saves
me a double reboot.

Christoph

Re: pxe support

[Sven Oehme]

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maybe i explain a bit more what i try to do, may be you are right and all 
this exists ...

i want to configure _somewhere_  in a central repository  all 
information's for all my domU's using the mac as reference, so my domU 
will look like this :

name = "rhel4-1"
memory = "256"
vif = [ 'type=ioemu, mac=00:16:3e:20:2b:7d, bridge=xenbr0', ]

in my "central repository" what ever that will be i want to specify the 
following :

ip = "192.168.0.230"
netmask = "255.255.255.0"
gateway = "192.168.0.1"
hostname = "rhel4-1"
root = "/dev/nfs"
nfs_server = "192.168.0.1"
nfs_root   = "/nfsroots/rhel4-1"

now i have a bunch of dom0 systems that boot up and run various xm creates 

each domU should now make a "broadcast" in the net and based on the mac it 
gets all the infos i stored in the repository and boots up the system over 
nfs.
i don't want to story _anything_ on the dom0 as i want to boot them as 
well over pxe, cd or from usb and the domU config files this node will 
start are created at boot time with a shell script based on some info's 
the dom0 retrieves at boot time.

Sven

Xen-devel-bounces@lists.xensource.com wrote on 01/18/2007 11:45:03 AM:

> On Thursday 18 January 2007 10:01, Tim Deegan wrote:
> > At 13:15 -0600 on 17 Jan (1169039714), Anthony Liguori wrote:
> > > Sven Oehme wrote:
> > > >Hi,
> > > >
> > > >i saw a bunch of patches from Anthony adding pxe support to qemu. 
will
> > > >that end in xen at some point , or is it already in ?
> > > >i searched in the archives and also the source but couldn't find
> > > >anything ..
> > >
> > > It should be there.  The QEMU patches were inspired by Tim's Xen
> > > patches.  I've seen a few commits that have disabled/enabled Option 
ROM
> > > loading which would prevent the etherboot ROM from getting loaded.
> > >
> > > Should PXE booting work ATM Tim?
> >
> > Works for me in -unstable.   Give the guest a vif, and choose boot=n.
> 
> There's no explicit PXE support needed in Xen. All what you need is a
> bootmanager, which passes a multiboot header to Xen. That's all.
> 
> PXE bootmanagers which support multiboot are PXELinux and PXEGrub
> (I'm aware of these two. I don't know if there are more.).
> Both work fine for me. I use them regularly for development/testing.
> 
> It makes more fun to build a kernel and boot it from network. It saves
> me a double reboot.
> 
> Christoph
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

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