Cleanly restart the default libvirt network

network-restart.sh

#!/bin/bash

virsh net-destroy kimgtnet0
virsh net-start kimgtnet0
virsh net-destroy kimgtnet1
virsh net-start kimgtnet1

VMS=$( virsh list | grep '-' | awk '{ print $2; }' )

for guest in $VMS ; do
    echo "Bouncing $guest"
    MACHINE_INFO=$( virsh dumpxml "$guest" | xpath -e /domain/devices/interface[1] 2> /dev/null )
    MACHINE_MAC=$( echo "$MACHINE_INFO" | grep "mac address" | cut -d '"' -f 2 )
    MACHINE_MOD=$( echo "$MACHINE_INFO" | grep "model type" | cut -d '"' -f 2 )
    MACHINE_SOURCE=$( echo "$MACHINE_INFO" | grep "source network" | cut -d '"' -f 2 )

echo "guest info is $MACHINE_INFO"
echo "guest info is $MACHINE_MAC"
echo "guest info is $MACHINE_MOD"
echo "guest info is $MACHINE_SOURCE"
set +e
    virsh detach-interface "$guest" network --mac "$MACHINE_MAC" && sleep 3
    virsh attach-interface "$guest" network $MACHINE_SOURCE --mac "$MACHINE_MAC" --model "$MACHINE_MOD" --source "$MACHINE_SOURCE"
    set -e
done