[libvirt-users] Guest startup process blocks if a hook's child process is still running (i.e : after forking)
Nicolas Roy-Renaud
nicolas.roy-renaud.1 at ens.etsmtl.ca
Tue Nov 8 13:06:21 UTC 2016
I'm still having this issue and I'd really like to know if there's
something about hooks I'm missing. I've seen a number of people with the
same issue on vfio-users before and it'f something I'd really like to
find a fix for.
- Nicolas
On 10/23/16 17:24, Nicolas Roy-Renaud wrote:
> I've been having issues with KVM lately where I sometimes put my host
> into sleep while a guest is still running, which prevents it from
> waking up properly. This is somewhat expected due to my setup, but I
> have mistakenly done this more than once and could use a workaround to
> stop this from happening.
>
> So I've been trying to setup a libvirt hook to fork an instance of
> systemd-inhibit when the start hook is called and keep it running
> until the shutdown hook is called. This seems to work well when I run
> the hook script in a normal bash shell, but running it through libvirt
> simply blocks the starting process until systemd-inhibit quits.
>
> Here's the script :
>
> LOCK_FILE="/tmp/vfio-lock-$OBJECT"
>
> if [ "$OPERATION" == "start" ]; then
> (
> touch "$LOCK_FILE";
> systemd-inhibit --what="sleep" \
> --who="libvirt" \
> --mode="block" \
> inotifywait -qq -e delete "$LOCK_FILE"
> ) & disown $!
> exit
> fi
>
> if [ "$OPERATION" == "shutdown" ]; then
> rm "$LOCK_FILE"
> fi
>
> Is there some way to make it so libvirt sees the hook script exiting
> and carries on with the rest of its guest startup process even after a
> process fork or would that require changes in the internal hook
> handling functions?
>
> - Nicolas
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