qm monitor and shell scripts

[ablock]

Hi,
I want to save the state of a virtual machine with a shell script. Manually I can do this job by open a qm shell (qm monitor VMID) and then enter:

stop
migrate "exec:dd of=state.img"
cont
quit

I tried to write these commands in a file named Komma and pipe this to the qm command like: cat Komma | qm monitor 101. It didn't work.

Does anybody knows how to do the job? Maybe there are qm commands, that do the same. I found out, that qm stop makes something complete different, than the stop command in the qm shell.

Thanks
Andreas Block

 

[dietmar]

Does anybody knows how to do the job? Maybe there are qm commands, that do the same. I found out, that qm stop makes something complete different, than the stop command in the qm shell.

pipe command into the monitor is simply not implemented (someone needs to implement it).

 

[kobuki]

This might be interesting for you: http://wiki.qemu.org/QMP

 

[ablock]

Hi,
thanks for the reply. Is there any other possibility to save a running virtual machine together with it's state, so that I can make a backup? Later it should be possible to start the virtual machine from the backup exactly in that state, I made the backup from.

A. Block

 

[dietmar]

Hi,
thanks for the reply. Is there any other possibility to save a running virtual machine together with it's state, so that I can make a backup? Later it should be possible to start the virtual machine from the backup exactly in that state, I made the backup from.

That would be an interesting vzdump extension/feature - not implemented currently.

 

[atuin]

Hi,

perhaps you can try with socat command
like this script

#!/bin/bash

QEMU_MONITOR_SOCKET_PATH=/var/run/qemu-server
QEMU_MONITOR_SOCKET_EXT=mon
SOCAT=$(which socat) || { echo "socat cmd not found => exit"; exit 1; }
VMID=101
command="command you want to run in qemu monitor"

echo "${command}" | ${SOCAT} unix-connect:${QEMU_MONITOR_SOCKET_PATH}/${VMID}.${QEMU_MONITOR_SOCKET_EXT} stdio

exit 0

I hope it will help you ...
Cyril

 

[ablock]

Hi,
works great. Thank you very much.

A. Block