On 07/19/2010 12:52 PM, Dag Wieers wrote:
Hi,
During a discussion it was apparent some people expect the KVM guests
to be cleanly shut down when the host is being rebooted/shut down.
Clearly this is not done as part of the /etc/init.d/libvirtd sysv
script stop.
So what likely is happening is that /etc/init/halt is sending TERM
signals to each remaining process, waits 5 seconds and then KILLs
them. Which would be fine if the kvm/qemu processes perform a shutdown
on a TERM signal _and_ they would in fact shut down cleanly within 5
seconds.
A mechanism like the above would be very helpful in some situations.
Has this been discussed before, and should we ? :-)
Thanks for any insights !
Here is the /etc/init.d/libvirtd script that I use to automatically send
kvm guests the ACPI poweroff signal, then wait 5 minutes for them to
shutdown, then pull the virtual plug. If they shutdown before then, the
script continues.
Jason
#!/bin/sh
# the following is the LSB init header see
#
http://www.linux-foundation.org/spec//booksets/LSB-Core-generic/LSB-Core-generic.html#INITSCRCOMCONV
#
### BEGIN INIT INFO
# Provides: libvirtd
# Should-Start: xend
# Default-Start: 3 4 5
# Short-Description: daemon for libvirt virtualization API
# Description: This is a daemon for managing guest instances
# and libvirt virtual networks
# See http://libvirt.org
### END INIT INFO
# the following is chkconfig init header
#
# libvirtd: guest and virtual network management daemon
#
# chkconfig: 345 97 03
# description: This is a daemon for managing guest instances
# and libvirt virtual networks
# See http://libvirt.org
#
# processname: libvirtd
# pidfile: /var/run/libvirtd.pid
#
# Sanity checks.
[ -x /usr/sbin/libvirtd ] || exit 0
# Source function library.
. /etc/rc.d/init.d/functions
SERVICE=libvirtd
PROCESS=libvirtd
OLD_PROCESS=libvirt_qemud
LIBVIRTD_CONFIG=
LIBVIRTD_ARGS=
KRB5_KTNAME=/etc/libvirt/krb5.tab
test -f /etc/sysconfig/libvirtd && . /etc/sysconfig/libvirtd
LIBVIRTD_CONFIG_ARGS=
if [ -n "$LIBVIRTD_CONFIG" ]
then
LIBVIRTD_CONFIG_ARGS="--config $LIBVIRTD_CONFIG"
fi
RETVAL=0
start() {
echo -n $"Starting $SERVICE daemon: "
mkdir -p /var/cache/libvirt
rm -rf /var/cache/libvirt/*
KRB5_KTNAME=$KRB5_KTNAME daemon --check $SERVICE $PROCESS --daemon
$LIBVIRTD_CONFIG_ARGS $LIBVIRTD_ARGS
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$SERVICE
}
stop() {
TIMEOUT=180
VMLIST=`virsh list|grep running|awk '{print $2}'`
# send all running VM's the shutdown signal
for vm in $VMLIST; do
echo shutting down guest: $vm
virsh shutdown $vm
sleep 1
done
COUNT=0
while [ "$COUNT" -lt "$TIMEOUT" ]; do
VMLIST=`virsh list|grep running|awk '{print $2}'`
virsh list| grep running > /dev/null
if [ $? == 1 ]; then
echo "All VM's successfully shutdown"
return
fi
echo "Waiting on the following VM's to shut down: $VMLIST"
sleep 5
COUNT=$(($COUNT+5))
done
VMLIST=`virsh list|grep running|awk '{print $2}'`
# send all running VM's the shutdown signal
for vm in $VMLIST; do
echo pulling the plug on guest: $vm
virsh destroy $vm
done
echo -n $"Stopping $SERVICE daemon: "
if [ "$(pidofproc $OLD_PROCESS)" != "" ]; then
killproc $OLD_PROCESS
RETVAL=$?
else
killproc $PROCESS
RETVAL=$?
fi
echo
if [ $RETVAL -eq 0 ]; then
rm -f /var/lock/subsys/$SERVICE
rm -f /var/run/$SERVICE.pid
rm -rf /var/cache/libvirt/*
fi
}
restart() {
stop
start
}
reload() {
echo -n $"Reloading $SERVICE configuration: "
if [ "$(pidofproc $OLD_PROCESS)" != "" ]; then
killproc $OLD_PROCESS -HUP
RETVAL=$?
else
killproc $PROCESS -HUP
RETVAL=$?
fi
echo
return $RETVAL
}
# See how we were called.
case "$1" in
start|stop|restart|reload)
$1
;;
status)
if [ "$(pidofproc $OLD_PROCESS)" != "" ]; then
status $OLD_PROCESS
RETVAL=$?
else
status $PROCESS
RETVAL=$?
fi
;;
force-reload)
reload
;;
condrestart|try-restart)
[ -f /var/lock/subsys/$SERVICE ] && restart || :
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|reload}"
exit 1
;;
esac
exit $RETVAL
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