Re: [fedora-virt] Routing to guests

[Robert Thiem]

>  From: Philip Rhoades
>  I can ssh from/to the host/guest OK but how do I set up a route (or
>  whatever is necessary) so that another machine:
>          eth0:        192.168.0.12
>  can ssh to the guest? - "ssh 192.168.122.68" gives "no route to host"
> -
>  http://docs.fedoraproject.org/virtualization-guide/f12/en-US/html/ but
>  the problem does not seem to be covered there. 
Alexander is correct in saying that bridging would allow you to do that.

There are two networking discussed in the guide.

The first is a NAT (network address translation), in which the guests are
given "private" ip addresses and any outbound traffic appears to be coming
from the host machine's IP address. This is the same as the setup on your
ADSL router where the internal network machines get addresses of
192.168.x.x but the internet sees your requests as coming from the IP
address of your router.

There should be lots of documentation in linux firewalling guides under
sections on NAT (or possibly called IP Masquerading in some). Have a look
at these for information on  port forwarding to reveal services
inside the virtual (such as ssh).

The other option is bridging. This shares the physical network interface
of the host with the guest. In this case the VM acts as though it's a
machine plugged into the same subnet as the host, its services are
accessible like those of the host and it's as vulnerable to attack as the
host.

Robert

Routing to guests

[Mark McLoughlin]

On Tue, 2009-11-24 at 11:03 +1000, Robert Thiem wrote:
>  The other option is bridging. This shares the physical network
> interface
>  of the host with the guest. In this case the VM acts as though it's a
>  machine plugged into the same subnet as the host, its services are
>  accessible like those of the host and it's as vulnerable to attack as the
>  host. 
... and instructions on how to configure this mode are available here:

  http://wiki.libvirt.org/page/Networking#Fedora.2FRHEL_Bridging

Cheers,
Mark.

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Philip Rhoades]

People,

I have found some threads (here and elsewhere) about doing this but 
they all seem to come back to the same problem - that the virtual guest 
treats the hard disk partition differently from how real Windows treats 
the partition - so it makes it difficult to be able to both dual-boot 
the Windows partition and also use the Windows partition in a Windows 
guest setup on Fedora.  Has anyone worked out how to do this 
conveniently?

Thanks,

Phil.
--
Philip Rhoades

GPO Box 3411
Sydney NSW	2001
Australia
E-mail:  phil(a)pricom.com.au

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Emanuel Rietveld]

On 12/31/2011 05:35 PM, Philip Rhoades wrote:
>  People,
>
>  I have found some threads (here and elsewhere) about doing this but 
>  they all seem to come back to the same problem - that the virtual 
>  guest treats the hard disk partition differently from how real Windows 
>  treats the partition - so it makes it difficult to be able to both 
>  dual-boot the Windows partition and also use the Windows partition in 
>  a Windows guest setup on Fedora.  Has anyone worked out how to do this 
>  conveniently?
>
>  Thanks,
>
>  Phil. 
When you give qemu-kvm a partition to use as disk for a guest, it does 
exactly that. It uses the partition as a disk for the guest. So, the 
guest sees a *disk* while in the physical situation it's a *partition*. 
You may be able to do what you want by attaching a whole disk to the 
guest, instead of just the partition.

Caveat 1: I would strongly recommend to use a second, separate physical 
disk for your windows boot, instead of running your host and the guest 
from the same physical disk. If multiple operating systems are writing 
to the same area of the disk at the same time, you can get nasty data 
corruption, which is one reason you usually attach only a designated 
partition to the guest, instead of a whole disk.

Caveat 2: You of course already know this, but Windows is not designed 
to be run in this configuration (same installation runs physical as well 
as virtual), so you may run into unexpected issues, even if you get it 
to work.

Emanuel

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Ian Pilcher]

On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
>  When you give qemu-kvm a partition to use as disk for a guest, it
> does
>  exactly that. It uses the partition as a disk for the guest. So, the
>  guest sees a *disk* while in the physical situation it's a *partition*.
>  You may be able to do what you want by attaching a whole disk to the
>  guest, instead of just the partition. 
I've often thought that it should be possible to cook something up with
device manager -- essentially creating a "wrapper" that provides a MBR,
etc. around a Windows logical volume or partition.  Might be a fun
project for someone.

>  Caveat 2: You of course already know this, but Windows is not
> designed
>  to be run in this configuration (same installation runs physical as well
>  as virtual), so you may run into unexpected issues, even if you get it
>  to work. 
The biggest issue I would expect would be constant requests to
"reactivate" the Windows VM/system.

-- 
========================================================================
Ian Pilcher                                         arequipeno(a)gmail.com
"If you're going to shift my paradigm ... at least buy me dinner first."
========================================================================

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Dor Laor]

On 01/03/2012 06:42 PM, Ian Pilcher wrote:
>  On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> > When you give qemu-kvm a partition to use as disk for a guest, it does
> > exactly that. It uses the partition as a disk for the guest. So, the
> > guest sees a *disk* while in the physical situation it's a *partition*.
> > You may be able to do what you want by attaching a whole disk to the
> > guest, instead of just the partition.
>
>  I've often thought that it should be possible to cook something up with
>  device manager -- essentially creating a "wrapper" that provides a MBR,
>  etc. around a Windows logical volume or partition.  Might be a fun
>  project for someone. 
I'm sure its possible to do that but it may require some hack of 
presenting a the original MBR as some type of shadow one for the guest 
or other trick. Ric, have you played w/ it?

> > Caveat 2: You of course already know this, but Windows is not designed
> > to be run in this configuration (same installation runs physical as well
> > as virtual), so you may run into unexpected issues, even if you get it
> > to work.
>
>  The biggest issue I would expect would be constant requests to
>  "reactivate" the Windows VM/system. 
Right. Some versions of windows license (VLK) ignore that too.

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Richard W.M. Jones]

On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
>  On 01/03/2012 06:42 PM, Ian Pilcher wrote:
>  >On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
>  >>When you give qemu-kvm a partition to use as disk for a guest, it does
>  >>exactly that. It uses the partition as a disk for the guest. So, the
>  >>guest sees a *disk* while in the physical situation it's a *partition*.
>  >>You may be able to do what you want by attaching a whole disk to the
>  >>guest, instead of just the partition.
>  >
>  >I've often thought that it should be possible to cook something up with
>  >device manager -- essentially creating a "wrapper" that provides a MBR,
>  >etc. around a Windows logical volume or partition.  Might be a fun
>  >project for someone.
>  
>  I'm sure its possible to do that but it may require some hack of
>  presenting a the original MBR as some type of shadow one for the
>  guest or other trick. Ric, have you played w/ it? 
Xen used to synthesize an MBR in the guest.

As Ian asked above, it's possible to do this with device-mapper too,
although I doubt it's a good idea, but here's how you'd do it anyway:

https://lists.fedoraproject.org/pipermail/virt/2010-September/002288.html
https://rwmj.wordpress.com/2010/09/30/technique-for-synthesizing-a-partit...

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://et.redhat.com/~rjones/virt-df/

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Philip Rhoades]

Rich,


On 2012-01-05 21:05, Richard W.M. Jones wrote:
>  On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
> > On 01/03/2012 06:42 PM, Ian Pilcher wrote:
> > >On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> > >>When you give qemu-kvm a partition to use as disk for a guest, it 
> > does
> > >>exactly that. It uses the partition as a disk for the guest. So, 
> > the
> > >>guest sees a *disk* while in the physical situation it's a 
> > *partition*.
> > >>You may be able to do what you want by attaching a whole disk to 
> > the
> > >>guest, instead of just the partition. 

Not possible in my situation - I want to be able to dual boot OR run 
Windows 7 as a guest using the same partition install.


> > >I've often thought that it should be possible to cook
> something up 
> > with
> > >device manager -- essentially creating a "wrapper" that provides a 
> > MBR,
> > >etc. around a Windows logical volume or partition.  Might be a fun
> > >project for someone.
> >
> > I'm sure its possible to do that but it may require some hack of
> > presenting a the original MBR as some type of shadow one for the
> > guest or other trick. Ric, have you played w/ it?
>
>  Xen used to synthesize an MBR in the guest.
>
>  As Ian asked above, it's possible to do this with device-mapper too,
>  although I doubt it's a good idea, but here's how you'd do it anyway:
>
>  
>  https://lists.fedoraproject.org/pipermail/virt/2010-September/002288.html
>  
>
> https://rwmj.wordpress.com/2010/09/30/technique-for-synthesizing-a-partit...

So if I understand this correctly - it IS possible to (easily) do what 
I want with Xen but NOT kvm?

Thanks,

Phil.
-- 
Philip Rhoades

GPO Box 3411
Sydney NSW	2001
Australia
E-mail:  phil(a)pricom.com.au

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Eric Blake]

On 01/05/2012 08:11 AM, Philip Rhoades wrote:
>  Rich,
>  
>  
>  On 2012-01-05 21:05, Richard W.M. Jones wrote:
> > On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
> >> On 01/03/2012 06:42 PM, Ian Pilcher wrote:
> >> >On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> >> >>When you give qemu-kvm a partition to use as disk for a guest, it does
> >> >>exactly that. It uses the partition as a disk for the guest. So, the
> >> >>guest sees a *disk* while in the physical situation it's a
> >> *partition*.
> >> >>You may be able to do what you want by attaching a whole disk to the
> >> >>guest, instead of just the partition.
>  
>  
>  Not possible in my situation - I want to be able to dual boot OR run
>  Windows 7 as a guest using the same partition install. 
Won't work, in general, because your virtual machine will present
different hardware to Windows than the native dual boot, and Windows is
super-finicky about being booted on the same hardware every time.

>  
>  
>  So if I understand this correctly - it IS possible to (easily) do what I
>  want with Xen but NOT kvm? 
No.  It's not possible to do what you want with either solution (at
least, not possible while still being above the law with Microsoft
product activation).

-- 
Eric Blake   eblake(a)redhat.com    [phone]
Libvirt virtualization library http://libvirt.org

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Ademar de Souza Reis Jr.]

On Fri, Jan 06, 2012 at 02:11:44AM +1100, Philip Rhoades wrote:
>  Rich,
>  
>  
>  On 2012-01-05 21:05, Richard W.M. Jones wrote:
>  >On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
>  >>On 01/03/2012 06:42 PM, Ian Pilcher wrote:
>  >>>On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
>  >>>>When you give qemu-kvm a partition to use as disk for a guest,
>  >>it does
>  >>>>exactly that. It uses the partition as a disk for the guest.
>  >>So, the
>  >>>>guest sees a *disk* while in the physical situation it's a
>  >>*partition*.
>  >>>>You may be able to do what you want by attaching a whole disk
>  >>to the
>  >>>>guest, instead of just the partition.
>  
>  
>  Not possible in my situation - I want to be able to dual boot OR run
>  Windows 7 as a guest using the same partition install.
>   
You can use a small image with grub to boot the windows
partition when running inside qemu. Basically a boot disk
with grub pointing to your real partition as seen from qemu.

I had my win7 partition booting this way under VirtualBox. It was
working perfectly (no hardware issues, win7 is smart enough
regarding auto-detection). *BUT* everytime I switched between the
VM and the real hardware, I had to reactivate my windows license
(which is legal, but cumbersome).

I gave up on trying to fix the license reactivation (my win7 is
for games anyway). But if you manage to mimic your hardware well
enough inside qemu (lots of variables) or trick windows
somehow (legal?), it should work. Please report your steps if you
succeed.

Cheers,
   - Ademar

>  
>  >>>I've often thought that it should be possible to cook something
>  >>up with
>  >>>device manager -- essentially creating a "wrapper" that
>  >>provides a MBR,
>  >>>etc. around a Windows logical volume or partition.  Might be a fun
>  >>>project for someone.
>  >>
>  >>I'm sure its possible to do that but it may require some hack of
>  >>presenting a the original MBR as some type of shadow one for the
>  >>guest or other trick. Ric, have you played w/ it?
>  >
>  >Xen used to synthesize an MBR in the guest.
>  >
>  >As Ian asked above, it's possible to do this with device-mapper too,
>  >although I doubt it's a good idea, but here's how you'd do it anyway:
>  >
>  >
>  >https://lists.fedoraproject.org/pipermail/virt/2010-September/002288.html
>  >
>
> >https://rwmj.wordpress.com/2010/09/30/technique-for-synthesizing-a-partition-table-on-a-naked-filesystem/
>  
>  
>  So if I understand this correctly - it IS possible to (easily) do
>  what I want with Xen but NOT kvm?
>  
>  Thanks,
>  
>  Phil.
>  -- 
>  Philip Rhoades
>  
>  GPO Box 3411
>  Sydney NSW	2001
>  Australia
>  E-mail:  phil(a)pricom.com.au
>  _______________________________________________
>  virt mailing list
>  virt(a)lists.fedoraproject.org
>  https://admin.fedoraproject.org/mailman/listinfo/virt 
-- 
Ademar de Souza Reis Jr.
Red Hat

^[:wq!

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Ademar de Souza Reis Jr.]

On Thu, Jan 05, 2012 at 10:07:31AM -0700, Eric Blake wrote:
>  On 01/05/2012 08:11 AM, Philip Rhoades wrote:
>  > Rich,
>  > 
>  > 
>  > On 2012-01-05 21:05, Richard W.M. Jones wrote:
>  >> On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
>  >>> On 01/03/2012 06:42 PM, Ian Pilcher wrote:
>  >>> >On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
>  >>> >>When you give qemu-kvm a partition to use as disk for a guest, it
> does
>  >>> >>exactly that. It uses the partition as a disk for the guest. So,
> the
>  >>> >>guest sees a *disk* while in the physical situation it's a
>  >>> *partition*.
>  >>> >>You may be able to do what you want by attaching a whole disk to
> the
>  >>> >>guest, instead of just the partition.
>  > 
>  > 
>  > Not possible in my situation - I want to be able to dual boot OR run
>  > Windows 7 as a guest using the same partition install.
>  
>  Won't work, in general, because your virtual machine will present
>  different hardware to Windows than the native dual boot, and Windows is
>  super-finicky about being booted on the same hardware every time. 
Win7 is (relativelly) smart. It worked perfectly here a while ago using
VirtualBox - and I have fancy hardware (it's a gaming machine).
But you have to reactivate your windows everytime you switch,
which is a PITA.

>  > 
>  > 
>  > So if I understand this correctly - it IS possible to (easily) do what I
>  > want with Xen but NOT kvm?
>  
>  No.  It's not possible to do what you want with either solution (at
>  least, not possible while still being above the law with Microsoft
>  product activation). 
I fail to see why it's ilegal (you are alowed to switch your
machine keeping your win7 installation, you just can't have
multiple installations). IANAL, though.

Cheers,
   - Ademar

-- 
Ademar de Souza Reis Jr.
Red Hat

^[:wq!

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Dor Laor]

On 01/09/2012 11:53 PM, Ademar de Souza Reis Jr. wrote:
>  On Thu, Jan 05, 2012 at 10:07:31AM -0700, Eric Blake wrote:
> > On 01/05/2012 08:11 AM, Philip Rhoades wrote:
> >> Rich,
> >>
> >>
> >> On 2012-01-05 21:05, Richard W.M. Jones wrote:
> >>> On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
> >>>> On 01/03/2012 06:42 PM, Ian Pilcher wrote:
> >>>>> On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> >>>>>> When you give qemu-kvm a partition to use as disk for a guest, it
> does
> >>>>>> exactly that. It uses the partition as a disk for the guest. So,
> the
> >>>>>> guest sees a *disk* while in the physical situation it's a
> >>>> *partition*.
> >>>>>> You may be able to do what you want by attaching a whole disk to
> the
> >>>>>> guest, instead of just the partition.
> >>
> >>
> >> Not possible in my situation - I want to be able to dual boot OR run
> >> Windows 7 as a guest using the same partition install.
> >
> > Won't work, in general, because your virtual machine will present
> > different hardware to Windows than the native dual boot, and Windows is
> > super-finicky about being booted on the same hardware every time.
>
>  Win7 is (relativelly) smart. It worked perfectly here a while ago using
>  VirtualBox - and I have fancy hardware (it's a gaming machine).
>  But you have to reactivate your windows everytime you switch,
>  which is a PITA.
>
> >>
> >>
> >> So if I understand this correctly - it IS possible to (easily) do what I
> >> want with Xen but NOT kvm?
> >
> > No.  It's not possible to do what you want with either solution (at
> > least, not possible while still being above the law with Microsoft
> > product activation).
>
>  I fail to see why it's ilegal (you are alowed to switch your
>  machine keeping your win7 installation, you just can't have 
Various versions of windows, especially client based are licensed to run 
on physical but not virtual machines. A special license (or just the pro 
version) is required to run them as virtual.

Disclaim - I'm not a lawyer and never read more than 5% of any EULA..

>  multiple installations). IANAL, though.
>
>  Cheers,
>      - Ademar
>

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Philip Rhoades]

Ademar,


On 2012-01-10 08:46, Ademar de Souza Reis Jr. wrote:
>  On Fri, Jan 06, 2012 at 02:11:44AM +1100, Philip Rhoades wrote:
> > Rich,
> >
> >
> > On 2012-01-05 21:05, Richard W.M. Jones wrote:
> > >On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
> > >>On 01/03/2012 06:42 PM, Ian Pilcher wrote:
> > >>>On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> > >>>>When you give qemu-kvm a partition to use as disk for a guest,
> > >>it does
> > >>>>exactly that. It uses the partition as a disk for the guest.
> > >>So, the
> > >>>>guest sees a *disk* while in the physical situation it's a
> > >>*partition*.
> > >>>>You may be able to do what you want by attaching a whole disk
> > >>to the
> > >>>>guest, instead of just the partition.
> >
> >
> > Not possible in my situation - I want to be able to dual boot OR run
> > Windows 7 as a guest using the same partition install.
> >
>
>  You can use a small image with grub to boot the windows
>  partition when running inside qemu. Basically a boot disk
>  with grub pointing to your real partition as seen from qemu.
>
>  I had my win7 partition booting this way under VirtualBox. It was
>  working perfectly (no hardware issues, win7 is smart enough
>  regarding auto-detection). *BUT* everytime I switched between the
>  VM and the real hardware, I had to reactivate my windows license
>  (which is legal, but cumbersome).
>
>  I gave up on trying to fix the license reactivation (my win7 is
>  for games anyway). But if you manage to mimic your hardware well
>  enough inside qemu (lots of variables) or trick windows
>  somehow (legal?), it should work. Please report your steps if you
>  succeed. 

I have been surviving quite happily without Windows for many years now 
but recently I have HAD to use it for only a couple of programs and I 
resent having to reboot for sometimes only 5mins a day - it would be 
excellent if I could get at the Win7 partition via a virtual arrangement 
but still have the dual boot option working OK if I need it . . the 
reactivation nonsense pisses me off . .

Thanks to all who posted! - it was much appreciated.

Regards,

Phil.
-- 
Philip Rhoades

GPO Box 3411
Sydney NSW	2001
Australia
E-mail:  phil(a)pricom.com.au

qemu-kvm to guest using physical Windows7 partition (on Fedora16)

[Philip Rhoades]

Ademar,


On 2012-01-10 08:46, Ademar de Souza Reis Jr. wrote:
>  On Fri, Jan 06, 2012 at 02:11:44AM +1100, Philip Rhoades wrote:
> > Rich,
> >
> >
> > On 2012-01-05 21:05, Richard W.M. Jones wrote:
> > >On Thu, Jan 05, 2012 at 10:27:29AM +0200, Dor Laor wrote:
> > >>On 01/03/2012 06:42 PM, Ian Pilcher wrote:
> > >>>On 01/02/2012 03:38 AM, Emanuel Rietveld wrote:
> > >>>>When you give qemu-kvm a partition to use as disk for a guest,
> > >>it does
> > >>>>exactly that. It uses the partition as a disk for the guest.
> > >>So, the
> > >>>>guest sees a *disk* while in the physical situation it's a
> > >>*partition*.
> > >>>>You may be able to do what you want by attaching a whole disk
> > >>to the
> > >>>>guest, instead of just the partition.
> >
> >
> > Not possible in my situation - I want to be able to dual boot OR run
> > Windows 7 as a guest using the same partition install.
> >
>
>  You can use a small image with grub to boot the windows
>  partition when running inside qemu. Basically a boot disk
>  with grub pointing to your real partition as seen from qemu. 

Do you mean something like:

/dev/vda:

Number  Start   End     Size    File system     Name  Flags
  1      1049kB  2097kB  1049kB                        bios_grub

/dev/sda:

  1      2097kB  107MB   105MB   ext4            ext4  boot
  2      107MB   996GB   996GB   ext4
  3      996GB   1000GB  3950MB  linux-swap(v1)

?


>  I had my win7 partition booting this way under VirtualBox. It was
>  working perfectly (no hardware issues, win7 is smart enough
>  regarding auto-detection). *BUT* everytime I switched between the
>  VM and the real hardware, I had to reactivate my windows license
>  (which is legal, but cumbersome). 

If the hardware was 100% under a virtualised Win7 I guess I might never 
need to dual boot . .


>  I gave up on trying to fix the license reactivation (my win7 is
>  for games anyway). But if you manage to mimic your hardware well
>  enough inside qemu (lots of variables) or trick windows
>  somehow (legal?), it should work. Please report your steps if you
>  succeed. 

I am tempted to give it a go . .

Thanks,

Phil.

-- 
Philip Rhoades

GPO Box 3411
Sydney NSW	2001
Australia
E-mail:  phil(a)pricom.com.au