On 2024-07-24 19:35, Brett Neumeier wrote:
I'm trying to set up supervision for a QEMU virtual machine on a machine that
uses s6 and s6-rc for service management.
I currently have my QEMU configured so that it shuts down gracefully when the
"system_powerdown" monitor command is executed. With s6, though, the only
idiomatic way that I can get the supervision frameowork to shut down a long-running
process is to send it a signal. I've verified that I can get QEMU to terminate by sending
it a SIGINT, SIGTERM, or SIGPWR; but all of those just cause it to terminate, they don't
send an ACPI shutdown request to the guest operating system.
Is there any way to trigger the same "system_powerdown" mechanism by sending
QEMU a signal? If not, can anyone suggest a way to add a signal handler that does that?
The method I usually use is to have the "monitor" listen for interactive
human commands on a per machine AF_UNIX socket like
/var/lib/qemu-wrapper/vmfoo/vmfoo.mon, then have my shutdown script does
this (within appropriate robustness conditions and checks):
# echo system_powerdown | socat - unix-connect:$socknam
I suspect Red Hat libvirt does something similar.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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