Fwd: Display/Console for HVM domUs

Fwd: Display/Console for HVM domUs

[jdsw]

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Forwarding to dev list.
/Jd

jdsw <jdsw2002@yahoo.com> wrote: Date: Thu, 9 Nov 2006 18:37:07 -0800 (PST)
From: jdsw <jdsw2002@yahoo.com>
Subject: Display/Console for  HVM domUs
To: XenUsers <xen-users@lists.xensource.com>

 Hi 
  I have couple of questions on displays under HVM
  1.  When I kill window of DomU with sdl=1, the dom also dies... Is this a bug ? or  expected behaviour. (quite annoying)

  2. How do I determine the display number for DomUs running with vnc ? For me, the vnc display numbers are determined by the order in which the domUs were started. This is highly inconveniernt. I tried the vncdisplay=5 in the domu config file but it does not help. 
   Also, xm list -l domname also does not contain any indication of what display is being used ? I want to programatically determined the display number.

Thanks
/Jd
   

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Re: Fwd: Display/Console for HVM domUs

[Daniel P. Berrange]

On Tue, Nov 14, 2006 at 04:52:41PM -0800, jdsw wrote:
> Forwarding to dev list.
> /Jd
> 
> jdsw <jdsw2002@yahoo.com> wrote: Date: Thu, 9 Nov 2006 18:37:07 -0800 (PST)
> From: jdsw <jdsw2002@yahoo.com>
> Subject: Display/Console for  HVM domUs
> To: XenUsers <xen-users@lists.xensource.com>
> 
>  Hi 
>   I have couple of questions on displays under HVM
>   1.  When I kill window of DomU with sdl=1, the dom also dies... Is this a bug ? 
>       or  expected behaviour. (quite annoying)

Its expected - whether its desirable is a completely different matter. I question
the usefullness of SDL at all because of its dependance on having a connection to
the X server available form the shell in which you launch the guest. I can't
imagine how this will ever work once XenD has support for managing inactive domains
and stopping/starting them via the XML-RPC interface - since you'll not even have
the SSH forwarded display anymore.

>   2. How do I determine the display number for DomUs running with vnc ? For me, 
> the vnc display numbers are determined by the order in which the domUs were 
> started. This is highly inconveniernt. I tried the vncdisplay=5 in the domu 
> config file but it does not help. 

If you specify 'vncunused=1' in the config file it will allocate the first unused
port number counting from 5900. If you want to specify an explicit display then
set 'vncdisplay=5' and 'vncunused=0'.

>    Also, xm list -l domname also does not contain any indication of what display
>  is being used ? I want to programatically determined the display number.

The info on what port is being listened on is not exposed by either xm or XenD.
Instead it is hidden away in xenstore.

  # xenstore-ls /local/domain/1 | grep vnc
     vnc-port = "5902"

If you have libvirt installed, then it is also available when using virsh
command to view an XML dump of a domain, eg

 # virsh dumpxml demovm | grep graphics
    <graphics type='vnc' port='5902'/>


Regards,
Dan.
-- 
|=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
|=-               Projects: http://freshmeat.net/~danielpb/               -=|
|=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505  -=| 

Re: Fwd: Display/Console for HVM domUs

[jdsw]

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Thanks Daniel.  This  clarifies.
I will give vnc stuff a shot.

It would be convenient to have vnc port number/display number available in the XML-RPC. 
 
Thanks
/Jd

"Daniel P. Berrange" <berrange@redhat.com> wrote: On Tue, Nov 14, 2006 at 04:52:41PM -0800, jdsw wrote:
> Forwarding to dev list.
> /Jd
> 
> jdsw  wrote: Date: Thu, 9 Nov 2006 18:37:07 -0800 (PST)
> From: jdsw 
> Subject: Display/Console for  HVM domUs
> To: XenUsers 
> 
>  Hi 
>   I have couple of questions on displays under HVM
>   1.  When I kill window of DomU with sdl=1, the dom also dies... Is this a bug ? 
>       or  expected behaviour. (quite annoying)

Its expected - whether its desirable is a completely different matter. I question
the usefullness of SDL at all because of its dependance on having a connection to
the X server available form the shell in which you launch the guest. I can't
imagine how this will ever work once XenD has support for managing inactive domains
and stopping/starting them via the XML-RPC interface - since you'll not even have
the SSH forwarded display anymore.

>   2. How do I determine the display number for DomUs running with vnc ? For me, 
> the vnc display numbers are determined by the order in which the domUs were 
> started. This is highly inconveniernt. I tried the vncdisplay=5 in the domu 
> config file but it does not help. 

If you specify 'vncunused=1' in the config file it will allocate the first unused
port number counting from 5900. If you want to specify an explicit display then
set 'vncdisplay=5' and 'vncunused=0'.

>    Also, xm list -l domname also does not contain any indication of what display
>  is being used ? I want to programatically determined the display number.

The info on what port is being listened on is not exposed by either xm or XenD.
Instead it is hidden away in xenstore.

  # xenstore-ls /local/domain/1 | grep vnc
     vnc-port = "5902"

If you have libvirt installed, then it is also available when using virsh
command to view an XML dump of a domain, eg

 # virsh dumpxml demovm | grep graphics
    


Regards,
Dan.
-- 
|=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
|=-               Projects: http://freshmeat.net/~danielpb/               -=|
|=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505  -=| 

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http://lists.xensource.com/xen-devel


 
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Re: Fwd: Display/Console for HVM domUs

[Andrew D. Ball]

Is anyone considering FreeNX in addition to VNC?

Peace.
Andrew

On Wed, 2006-11-15 at 01:05 +0000, Daniel P. Berrange wrote:
> On Tue, Nov 14, 2006 at 04:52:41PM -0800, jdsw wrote:
> > Forwarding to dev list.
> > /Jd
> > 
> > jdsw <jdsw2002@yahoo.com> wrote: Date: Thu, 9 Nov 2006 18:37:07 -0800 (PST)
> > From: jdsw <jdsw2002@yahoo.com>
> > Subject: Display/Console for  HVM domUs
> > To: XenUsers <xen-users@lists.xensource.com>
> > 
> >  Hi 
> >   I have couple of questions on displays under HVM
> >   1.  When I kill window of DomU with sdl=1, the dom also dies... Is this a bug ? 
> >       or  expected behaviour. (quite annoying)
> 
> Its expected - whether its desirable is a completely different matter. I question
> the usefullness of SDL at all because of its dependance on having a connection to
> the X server available form the shell in which you launch the guest. I can't
> imagine how this will ever work once XenD has support for managing inactive domains
> and stopping/starting them via the XML-RPC interface - since you'll not even have
> the SSH forwarded display anymore.
> 
> >   2. How do I determine the display number for DomUs running with vnc ? For me, 
> > the vnc display numbers are determined by the order in which the domUs were 
> > started. This is highly inconveniernt. I tried the vncdisplay=5 in the domu 
> > config file but it does not help. 
> 
> If you specify 'vncunused=1' in the config file it will allocate the first unused
> port number counting from 5900. If you want to specify an explicit display then
> set 'vncdisplay=5' and 'vncunused=0'.
> 
> >    Also, xm list -l domname also does not contain any indication of what display
> >  is being used ? I want to programatically determined the display number.
> 
> The info on what port is being listened on is not exposed by either xm or XenD.
> Instead it is hidden away in xenstore.
> 
>   # xenstore-ls /local/domain/1 | grep vnc
>      vnc-port = "5902"
> 
> If you have libvirt installed, then it is also available when using virsh
> command to view an XML dump of a domain, eg
> 
>  # virsh dumpxml demovm | grep graphics
>     <graphics type='vnc' port='5902'/>
> 
> 
> Regards,
> Dan.

Re: Fwd: Display/Console for HVM domUs

[Anthony Liguori]

Andrew D. Ball wrote:
> Is anyone considering FreeNX in addition to VNC?

FreeNX isn't a framebuffer based protocol.  It is a window based 
protocol.  There's not enough information at the QEMU level to do a 
window based protocol.  Perhaps if we had a paravirtual display driver...

Regards,

Anthony Liguori

> Peace.
> Andrew
> 
> On Wed, 2006-11-15 at 01:05 +0000, Daniel P. Berrange wrote:
>> On Tue, Nov 14, 2006 at 04:52:41PM -0800, jdsw wrote:
>>> Forwarding to dev list.
>>> /Jd
>>>
>>> jdsw <jdsw2002@yahoo.com> wrote: Date: Thu, 9 Nov 2006 18:37:07 -0800 (PST)
>>> From: jdsw <jdsw2002@yahoo.com>
>>> Subject: Display/Console for  HVM domUs
>>> To: XenUsers <xen-users@lists.xensource.com>
>>>
>>>  Hi 
>>>   I have couple of questions on displays under HVM
>>>   1.  When I kill window of DomU with sdl=1, the dom also dies... Is this a bug ? 
>>>       or  expected behaviour. (quite annoying)
>> Its expected - whether its desirable is a completely different matter. I question
>> the usefullness of SDL at all because of its dependance on having a connection to
>> the X server available form the shell in which you launch the guest. I can't
>> imagine how this will ever work once XenD has support for managing inactive domains
>> and stopping/starting them via the XML-RPC interface - since you'll not even have
>> the SSH forwarded display anymore.
>>
>>>   2. How do I determine the display number for DomUs running with vnc ? For me, 
>>> the vnc display numbers are determined by the order in which the domUs were 
>>> started. This is highly inconveniernt. I tried the vncdisplay=5 in the domu 
>>> config file but it does not help. 
>> If you specify 'vncunused=1' in the config file it will allocate the first unused
>> port number counting from 5900. If you want to specify an explicit display then
>> set 'vncdisplay=5' and 'vncunused=0'.
>>
>>>    Also, xm list -l domname also does not contain any indication of what display
>>>  is being used ? I want to programatically determined the display number.
>> The info on what port is being listened on is not exposed by either xm or XenD.
>> Instead it is hidden away in xenstore.
>>
>>   # xenstore-ls /local/domain/1 | grep vnc
>>      vnc-port = "5902"
>>
>> If you have libvirt installed, then it is also available when using virsh
>> command to view an XML dump of a domain, eg
>>
>>  # virsh dumpxml demovm | grep graphics
>>     <graphics type='vnc' port='5902'/>
>>
>>
>> Regards,
>> Dan.

Re: Fwd: Display/Console for HVM domUs

[Ewan Mellor]

On Tue, Nov 14, 2006 at 04:52:41PM -0800, jdsw wrote:

>      Also, xm list -l domname also does not contain any indication of what
>   display is being used ? I want to programatically determined the display
>   number.

That's a nice idea.  I've pushed a patch to do exactly that, so

xm li --long <domid> | sed -n 's/^.*(vnc-port \([^)]*\).*$/\1/p'

ought to do what you want.

Ewan.