Hookscript Languages?

[Stereoscope]

What languages are supported for hookscripts? Perl obviously is as per /usr/share/pve-docs/examples/guest-example-hookscript.pl

Can I use any other languages?

 

[Impact]

Pretty sure you can use whatever you can execute.

 

[Stereoscope]

Thanks, couldn't find any sources that talk about this.

 

[aaron]

Yes, any executable works. As in the Perl based example, the hookscript will get a few parameters that you will need to handle. So it can be another scripting language like python or bash, or you might compile your own little program.

 

[gfngfn256]

Here is a small neat bash hookscript created (& apparently working / tested) by the user leesteken, which demonstrates it simplicity.

Post in thread 'Hookscript - GPU (VM) switch'

Jan 19, 2026

Here is an example of a hookscipt that shuts down VM 100 (if it is running) before starting and starts VM 100 when it shuts down (and the host is not shutting down).

#!/bin/bash
if [ "$2" == 'pre-start' ]
then
    if /usr/sbin/qm status "100" | grep -q running
    then
        /usr/sbin/qm shutdown 100
    fi
elif [ "$2" == 'post-stop' ]
then
    if systemctl is-system-running | grep -v -q 'running'
    then
        echo "System shutting down, don't start VMs"
    elif [ "$1" != "100" ]
    then
        nohup /usr/sbin/qm start 100 &>/dev/null &
    fi
fi

I'm sure you can adapt it...

• leesteken

• 

Please note you have to make that script executable & store it in a suitable snippets storage & set it to the config of the LXC/VM.

 

[Stereoscope]

Please note you have to make that script executable...

I always forget to do this. Still relatively new to Linux.