init scripts for KVM guests

init scripts for KVM guests

[Saman Behnam]

Hi there,


I've wrote a script for starting and stopping the KVM guest machines
either by saving and restoring or by graceful shutdown and start. My
question, is there an option within "libvirt" to make the KVM guest
machines 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 in the XML config file located in
"/etc/libvirt/qemu/".
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 "shutdown" case it will shutdown 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 "$VM_NAME" is not running!!! Exiting."
                exit 1
        fi
        PID=$(ps ax|grep $VM_NAME|grep kvm|cut -c 1-6)
        COUNT=0
        echo "kvmshutdown \: Shutting down "$VM_NAME" with pid $PID"
        virsh shutdown "$VM_NAME" && exit 0
        while [ "$COUNT" -lt "$TIMEOUT" ]; do
                ps --pid $PID > "$DEVNULL" 2>&1
                if [ "$?" -eq "1" ];  then
                        exit 0
                fi
                sleep 5
                COUNT=$(($COUNT+5))
        done
        echo "kvmshutdown \: Timeout happend. Destroying VM "$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 "$VM_NAME" is not running!!! Exiting."
                exit 1
        fi
        PID=$(ps ax|grep $VM_NAME|grep kvm|cut -c 1-6)
        COUNT=0
        echo "vmsave \: Saving VM "$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" && exit 0
        while [ "$COUNT" -lt "$TIMEOUT" ]; do
                ps --pid $PID > "$DEVNULL" 2>&1
                if [ "$?" -eq "1" ];  then
                        exit 0
                fi
                sleep 5
                COUNT=$(($COUNT+5))
        done
        echo "vmsave \: Timeout happend. Destroying VM "$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"/"$VM_NAME".kvm.save > /dev/null 2>&1 ; then
                echo "Restore file "$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


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

 -- 

 mit freundlichen Grüßen / Kind regards

 Saman Behnam

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