Xen users - Jul 2007 - qemu monitor with only vnc and ssh?

Hi again,
	I''m working on a remote Xen server where I frequently have to insert/ 
swap CD''s into HVM''s.  Bandwidth is such that I really want
VNC
rather than X-forwarded SDL; my understanding, though, is that the  
qemu monitor is disabled under VNC for security reasons.  It  
certainly doesn''t work for me.

	I can log into the Xen dom0 as root; is there any way I can get at  
domU monitors from there?  If not, is there any alternative that''s  
not "change the Xen config file and reboot the domU" or "render
an
SDL display to an Xvnc4 instance on dom0, and use SSH tunneling to  
securely forward that display to my local machine"?

	Relatedly, though less important: Is there a way to do this with  
PVM''s (since they don''t have the qemu monitor)?

Thanks,
Adam


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Adam Seering wrote:
> Hi again,
>     I''m working on a remote Xen server where I frequently have to 
> insert/swap CD''s into HVM''s.  Bandwidth is such that I
really want VNC
> rather than X-forwarded SDL; my understanding, though, is that the 
> qemu monitor is disabled under VNC for security reasons.  It certainly 
> doesn''t work for me.
>
>     I can log into the Xen dom0 as root; is there any way I can get at 
> domU monitors from there?  If not, is there any alternative that''s
not
> "change the Xen config file and reboot the domU" or "render
an SDL
> display to an Xvnc4 instance on dom0, and use SSH tunneling to 
> securely forward that display to my local machine"?
>
>     Relatedly, though less important: Is there a way to do this with 
> PVM''s (since they don''t have the qemu monitor)?
Is this for installation processes? Can you use DVD''s? I just re-wrote 
the CentOS installation DVD builder to work for RHEL 5, and would be 
happy to post a copy.

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>>     Relatedly, though less important: Is there a way to do this  
>> with PVM''s (since they don''t have the qemu monitor)?
> Is this for installation processes? Can you use DVD''s? I just re- 
> wrote the CentOS installation DVD builder to work for RHEL 5, and  
> would be happy to post a copy.
It''s actually for installing many different pieces of software that  
come on separate CD''s.  (Also, it''s for Windows Vista (HVM)
and
Ubuntu (PVM) rather than RHEL, though I might be working with RHEL 4  
or 5 shortly.)  I could try to put them all on one big disk image and  
mount that; the problem is, I don''t yet know the full list of
CD''s
that I''ll need, and I''m likely to get more with time.

Thanks though,
Adam

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Adam Seering wrote:
>
>>>     Relatedly, though less important: Is there a way to do this
with
>>> PVM''s (since they don''t have the qemu monitor)?
>> Is this for installation processes? Can you use DVD''s? I just 
>> re-wrote the CentOS installation DVD builder to work for RHEL 5, and 
>> would be happy to post a copy.
>
> It''s actually for installing many different pieces of software
that
> come on separate CD''s.  (Also, it''s for Windows Vista
(HVM) and Ubuntu
> (PVM) rather than RHEL, though I might be working with RHEL 4 or 5 
> shortly.)  I could try to put them all on one big disk image and mount 
> that; the problem is, I don''t yet know the full list of
CD''s that I''ll
> need, and I''m likely to get more with time.
I only have experience with PVMs, but I wonder why doing:

xm block-attach ${domid} phy:/dev/cd-rom /dev/sdd r

I guess this doesn''t work with HVM?

The other thing I do... just in general is make .iso images and loop 
back in Linux when I need them and in Windows there are .iso mount tools 
like VirtualCD (or Alcohol?).

-Scott

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> I only have experience with PVMs, but I wonder why doing:
> 
> xm block-attach ${domid} phy:/dev/cd-rom /dev/sdd r
> 
> I guess this doesn''t work with HVM?
> 
> The other thing I do... just in general is make .iso images and loop
> back in Linux when I need them and in Windows there are .iso mount
tools
> like VirtualCD (or Alcohol?).
I do this:

"
xm block-configure $domain phy:$device hdc:cdrom r
"
($device is /dev/cdrom or /images/cdimage.iso etc)

Under windows, you have to first either eject the CD under windows
(right click + eject on the drive in explorer), or do:

"
xm block-configure $domain phy:/dev/null hdc:cdrom r
"

First, which seems to do the same thing. My CD change script is:

"
xm block-configure $domain phy:/dev/null hdc:cdrom r
sleep 1
xm block-configure $domain phy:$device hdc:cdrom r
"

I imagine that would also work on a pv domain, but I''ve never tried it.

James


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