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Re: [Qemu-devel] What is the best way to control qemu on a remote box?

From: n schembr
Subject: Re: [Qemu-devel] What is the best way to control qemu on a remote box?
Date: Fri, 27 Jul 2007 09:22:08 -0700 (PDT)

socat - unix-connect:/vservers/qemu/cms1/cms1.sock  works well. 
Ctrl-d  stops socat.

I'd prefer not to have vnc running unless I needed it,but some of my guests 
hang when -nographic is used.  Note :  the guest has X running and the host is 
running headless.

Is system_powerdown a better way to stop the host?
Is system_powerdown a soft operation like the atx powersupply?  It did not work 
with  a smoothwall guest.

I can see adding '-serial unix:/vservers/qemu/cms1/ttyS0.sock,server,nowait' 
for better control.

If I have  '-no-reboot' on the command line and I reboot with send 
ctrl-alt-delete why is it just getting to halt?  It never reboots and qemu 
continues to run.  I'll build a clean guest and try to give a bug report.

Is there a way to use the monitor and see what the guest is doing? 

----- Original Message ----
From: Ben Taylor <address@hidden>
To: n schembr <address@hidden>
Sent: Friday, July 27, 2007 8:45:46 AM
Subject: Re: [Qemu-devel] What is the best way to control qemu on a remote box?

why are you using a socket for the monitor?  YOu can easily go into monitor
mode when using VNC, and I amd using ubuntu 7.04 as a guest and
vnc it to my main workstation all the time.  Yes, you run shutdown, and it 
something still there, but once in the monitor, you type "quit" and it ends.

I supposed using your socket method, you could wait some predefined time
and then send "quit" using the send-key method you used.

Just seems convoluted to send a ctrl-alt-del via send-key as opposed to being
logged in via SSH, or just shutdown from the VNC window.


---- n schembr <address@hidden> wrote: 
> I'm using a command line like:
qemu -vnc :4 -kernel-kqemu -std-vga -no-reboot -monitor 
unix:/vservers/qemu/cms1/cms1.sock,server,nowait -boot c -hda hda1.img -hdb 
swap.img -net nic,vlan=0,macaddr=00:16:3e:00:0f:00 -net 
tap,vlan=0,ifname=br0-cms1,script=/etc/qemu-ifup-br0 -m 256

I'm running linux but would like the system to feel as close to real hardware 
as I can get. 

The the shutdown process is a pain.   

        echo -n "Asking  $GUEST to stop...(sleep $WAIT_FOR_GUEST)" 
        su $USER -c " echo 'sendkey ctrl-alt-delete' |socat - 
unix-connect:/$BasePath/$GUEST/$GUEST.sock "  >/dev/null

With some distros the guest stops and qemu exits.  On Ubuntu the guest will 
shutdown and get to "halt", but qemu will never exit.

What is the correct way to setup a remote system like this.  I would like to 
use the qemu  monitor  mode better.

Note: The host system is 11 hour away, and I will never sit at the hosts 

Thank you for your time.

Nicholas A. Schembri
state college pa usa


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