Script that creates a number of Cirros instances and then attempts to destroy them in parallel

gistfile1.sh

#!/bin/bash

set -x

NUMDOMAINS=${1:-10}
PARALLEL=${2:-15}

BACKINGFILE=/var/lib/libvirt/images/test-cirros-base.qcow2
SOURCE=https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img

parallel_virsh() {
  cmd=${1:-domstate}
  for j in `seq $NUMDOMAINS`; do
    echo test-${j} 
  done | xargs -n 1 -P $PARALLEL virsh $cmd
}

wget -nc -O $BACKINGFILE $SOURCE

set -e

# Create domains
for i in `seq $NUMDOMAINS`; do
  img=/var/lib/libvirt/images/test-$i.qcow2
  qemu-img create -f qcow2 -b $BACKINGFILE $img
  virt-install --virt-type qemu --hvm --nonetwork --name test-${i} --ram 64 --import --disk $img --noreboot
done

# Start domains in parallel
parallel_virsh start

# Destroy domains in parallel
parallel_virsh destroy

# Undefine (remove) domains in parallel
parallel_virsh undefine