KVM 인스턴스 생성 스크립트

kvm_vm.sh

#!/bin/bash
set -e

function usage(){
	echo "Usage: `basename $0` [domain]"
	echo "	-m	memory as Mb"
	echo "	-s	disk as Gb"
	echo "	-n	comma separated network"
	echo "	-f	first delete image file"
	echo
}

function fatal(){
	echo $@
	exit
}

function free_loop(){
	for dev in `ls /dev/loop[0-9]*`; do
		if losetup -a | grep -q "$dev"; then
			continue
		fi

		echo $dev
		return
	done

	fatal 'no available loop device'
}

while getopts "m:s:n:f" opt; do
	case $opt in
		m)
			MEM="$OPTARG"
			;;
		s)
			SIZE="$OPTARG"
			;;
		n)
			NET="$OPTARG"
			;;
		f)
			recreate=1
			;;
		\?)
			exit
			;;
	esac
done

shift $((OPTIND-1))

domain=$1
if [ -z "$domain" ]; then
	usage
	fatal 'domain name required'
fi

MEM=${MEM:-1024}
SIZE=${SIZE:-10}
NET=${NET:-br0}
for net in ${NET//,/ }; do
	net_opt="$net_opt --network bridge:$net,model=virtio "
done

IMAGE_DIR=`dirname $0`/images
image=${IMAGE_DIR}/${domain}.qcow2

if [ "$recreate" == "1" ]; then
	virsh destroy $domain || true
	virsh undefine $domain || true
	rm -f ${image}
fi

qemu-img create -f qcow2 $image ${SIZE}G
boot_opt="--cdrom ${IMAGE_DIR}/ubuntu-12.04.4-server-amd64.iso"

virt-install \
	--name="$domain" \
	--vcpus=1 \
	--ram=${MEM} \
	--os-type=linux \
	--os-variant=ubuntuprecise \
	$net_opt \
	$boot_opt \
	--disk path=${image},format=qcow2,bus=virtio,cache=none \
	--graphics vnc,listen=0.0.0.0 \
	--accelerate \
	--noautoconsole

virsh vncdisplay $domain

# vim: nu ai ts=4 sw=4