init scripts for KVM guests UPDATE!

Saman Behnam
2009-07-18T00:14:14Z

Hi there,

here is an update for the "init scripts for KVM guests"I've wrote for
starting and stopping the KVM guest machines either by saving and
restoring or by gracefully shutdown and start. My question, is there an
option within "libvirt" to make the KVM guest mashines get saved when
the KVM host shuts down? I had problems to gracefully shutdown Windows
VM's!!!

Right now I had to write these scripts to save and restore the machines
upon starting and stopping the KVM host.

Many Thanks for your response

vim /etc/init.d/kvm-win0-rcs

###################################################################################################

#!/bin/sh

### BEGIN INIT INFO
# Provides: kvm-win0-rcs
# Required-Start: $kvm $libvirtd
# Required-Stop: $kvm $libvirtd
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Starting/Saving, Stopping/Restoring kvm-win0-rcs
KVM guest.
# Description: Starting/Saving, Stopping/Restoring KVM guest "win0".
# kvm-win0-rcs KVM guest.
### END INIT INFO#

# Please copy the init scripts of the KVM VM's in to "/etc/init.d" and
then run! "for i in `cd /etc/init.d && ls kvm-*` ; do update-rc.d $i
defaults 21 19 ; done"

# U need per VM a separate start-stop-script!
VM_NAME="win0" # Name of ur guest VM
TIMEOUT=300
VM_SAVE_DIR="/kvm/tmp/vm_save_dir" # Directory for storing the guest VM
save data..
DEVNULL="/dev/null"
#ACTION="shutdown"
ACTION="save" # ACTION takes one argument, either "save" or "shutdown".
In the "save" case it will save the VM and restore it while stopping or
starting. In the "shtudown" case it will sutdown then VM and start it
while stopping or starting.

vmshutdown () {
if ! virsh list|grep running|grep -v grep|grep "$VM_NAME" >
"$DEVNULL" 2>&1; then
echo "VM "$VM_NAME" is not running!!! Exiting."
exit 1
fi
COUNT=0
echo "kvmshutdown \: Shutting down "$VM_NAME" with pid $PID"
virsh shutdown "$VM_NAME" &
while [ "$COUNT" -lt "$TIMEOUT" ]; do
if ! virsh list|grep running|grep -v grep|grep
"$VM_NAME" > "$DEVNULL" 2>&1; then
exit 0
fi
sleep 5
COUNT=$(($COUNT+5))
done
echo "kvmshutdown \: Timeout happend. Destroying VM "$VM_NAME""
virsh destroy "$VM_NAME" && exit 1
}

vmstart () {
if virsh list|grep running|grep -v grep|grep "$VM_NAME" >
"$DEVNULL" 2>&1; then
echo "VM "$VM_NAME" is allready running!!! Exiting."
exit 1
fi
virsh start "$VM_NAME" && exit 0
exit 1
}

vmsave () {
if ! virsh list|grep running|grep -v grep|grep "$VM_NAME" >
"$DEVNULL" 2>&1; then
echo "VM "$VM_NAME" is not running!!! Exiting."
exit 1
fi
COUNT=0
echo "vmsave \: Saving VM "$VM_NAME""
if [ ! -d "$VM_SAVE_DIR" ]; then
echo "creating "$VM_SAVE_DIR""
mkdir -p "$VM_SAVE_DIR"
fi
virsh save "$VM_NAME" "$VM_SAVE_DIR/$VM_NAME.kvm.save" &
while [ "$COUNT" -lt "$TIMEOUT" ]; do
if ! virsh list|grep running|grep -v grep|grep
"$VM_NAME" > "$DEVNULL" 2>&1; then
exit 0
fi
sleep 5
COUNT=$(($COUNT+5))
done
echo "vmsave \: Timeout happend. Destroying VM "$VM_NAME""
virsh destroy "$VM_NAME"
exit 1
}

vmrestore () {
if virsh list|grep running|grep -v grep|grep "$VM_NAME" >
"$DEVNULL" 2>&1; then
echo "VM "$VM_NAME" is allready running!!! Exiting."
exit 1
fi
if ! ls "$VM_SAVE_DIR"/"$VM_NAME".kvm.save > "$DEVNULL" 2>&1 ; then
echo "Restore file "$VM_NAME".kvm.save in "$VM_SAVE_DIR"
not found! Starting VM!!!"
vmstart
exit 1
fi
cd "$VM_SAVE_DIR"
echo "vmrestore \: Restoring VM "$VM_NAME""
virsh restore "$VM_SAVE_DIR"/"$VM_NAME".kvm.save && rm -f
"$VM_SAVE_DIR"/"$VM_NAME".kvm.save
exit 0
}

# Here is the start of the main "program" :-)
case "$1" in
start)
case "$ACTION" in
save)
vmrestore
;;
shutdown)
vmstart
;;
esac
;;
stop)
case "$ACTION" in
save)
vmsave
;;
shutdown)
vmshutdown
;;
esac
;;

*)
N="$0"
echo "Usage: "$N" {start|stop}" >&2
exit 1
;;
esac
exit 0

###################################################################################################

Please tell also if there is an official script for gracefully stopping
/ starting KVM VM's???

greets

saman

--

mit freundlichen Grüßen / Kind regards

Saman Behnam

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