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#!/bin/bash
# depends on following packages:
# apt-get install virtinst libvirt-bin dosfstools mtools kvm
# For resizing the root partition we tried two ways:
# sfdisk
# ------
# For sfdisk we need util-linux >= 2.17.2-3 (debian wheezy, ubuntu oneiric),
# because of the sfdisk-feature which lets us script the growing of the root partition.
# see https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/686124
# apt-get install -t wheezy util-linux
# parted
# ------
# seems to be more robust than sfdisk, so we use that approach
# unfortunatly, there's no way to resize a partition with parted >= 2.4
# deleting and recreating is the only way, which leaves us with an
# dirty workaround, giving the beginning of the root partition in sectors
# with the variable $ROOT_PARTITION_BEGINNING
# defaults, configurable in config
VG='vg01'
ETC='/etc/libvirt/local/cloudinit'
CONFIG="$ETC/cloudinit.cfg"
VARDIR='/var/lib/libvirt/cloudinit'
SCRIPTDIR='/usr/local/bin/leap_cloudadmin'
KVM_URI='qemu:///system'
SEED='cloudinit_seed.img'
BASEIMAGE='leap-baseimage'
SWAPUUID='3a79d708-2a74-4344-a953-15e955dbdae7'
# Defaults for leap-baseimage, change if you
# have a different disk layout
ROOT_PARTITION_NR='2'
ROOT_PARTITION_BEGINNING='4096s'
# unconfigurable variables
MIN_ROOTSIZE=2
DEFAULT_SWAPSIZE=512
rootsize=$MIN_ROOTSIZE
swapsize=$DEFAULT_SWAPSIZE
# overwrite defaults
[ -e $CONFIG ] && . $CONFIG
[ -z "$LC_ALL" ] && LC_ALL="en_US.UTF-8"
fail() { [ $# -eq 0 ] || echo "$@"; exit 1; }
bad_usage() { usage 1>&2; [ $# -eq 0 ] || fail "$@"; exit 1; }
usage() {
cat <<EOF
Usage: ${0##*/} -r <gb> -s <mb> -n guest_name
Creates a new guest VM using cloud-init to utilize nocloud.
Uses $ETC/<guest_name>.cfg as meta- und user-data file
options:
-h show usage
-r size root size in GB. Defaults to minimal value of $MIN_ROOTSIZE GB.
-s size swap size in MB. Defaults to $DEFAULT_SWAPSIZE MB.
-n name guestname
EOF
}
# Parse cmdline options
while getopts "hr:s:n:" OPTION
do
#echo $OPTION $OPTARG
case $OPTION in
h) usage
exit 0;;
r) rootsize=$OPTARG;;
s) swapsize=$OPTARG;;
n) vmname=$OPTARG;;
esac
done
[ -z $vmname ] && bad_usage "must provide guest name"
[ $# -gt 6 ] && bad_usage "too many arguments"
[ $rootsize -lt $MIN_ROOTSIZE ] && bad_usage "Minimal root size is $MIN_ROOTSIZE GB !"
cfg="$ETC/$vmname.cfg"
rootdev="/dev/$VG/${vmname}-root"
swapdev="/dev/$VG/${vmname}-swap"
# requirements
echo "mtools_skip_check=1">~/.mtoolsrc
[ -e $VARDIR ] || ( mkdir $VARDIR ; chown libvirt-qemu $VARDIR )
[ -e $rootdev ] && fail "$rootdev exists - please delete it or choose another guest name"
[ -e $swapdev ] && fail "$swapdev exists - please delete it or choose another guest name"
[ -e $cfg ] || fail "please provide config file in $cfg"
echo
echo "Creating guest VM $vmname:"
echo "Root size: $rootsize GB, using $rootdev"
echo "Swap size: $swapsize MB, using $swapdev"
echo "using $cfg for cloud-init"
echo
echo "OK ? <Ctrl-C> to abort, <enter> to resume."
read enter
# is a VM with the same name defined ?
virsh dominfo $vmname > /dev/null 2>&1
if [ $? -eq 0 ]; then fail "Domain $vmname is defined in libvirt. Please undefine first."; fi
# create root and swap disk
lvcreate -L ${rootsize}g -n ${vmname}-root $VG
lvcreate -L ${swapsize}m -n ${vmname}-swap $VG
mkswap -U $SWAPUUID $swapdev
sleep 4
virt-clone --connect $KVM_URI -o $BASEIMAGE -n $vmname -f $rootdev --force
# resize root partition
# echo ",+," | sfdisk -q -N2 /dev/$VG/$vmname > /dev/null 2>&1
# sfdisk is unreliable for us and doesn't work on a new kvm host
parted $rootdev --script -- rm $ROOT_PARTITION_NR
parted $rootdev --script -- mkpart primary $ROOT_PARTITION_BEGINNING -1s
# create cloudinit seed disk
csplit -q --prefix "$VARDIR/$vmname" $cfg '/#cloud-config/'
metadata="$VARDIR/${vmname}00"
userdata="$VARDIR/${vmname}01"
$SCRIPTDIR/libvirt-make-seed-disk $VARDIR/$vmname-$SEED $userdata $metadata
echo
echo "Cloudinit-seeddisk is at $VARDIR/$vmname-$SEED, attaching after booting"
echo
echo "Finished creating guest $vmname. Enjoy."
echo
echo "Press <return> to start the new guest."
read bogus
echo
echo 'Starting new guest, attaching to console. Exit with Ctrl+]'
echo
virsh start $vmname
sleep 2
# create seed- and swapdisk definition and attach them
virsh attach-disk $vmname --source $swapdev --target vdb --config
virsh attach-disk $vmname --source $VARDIR/$vmname-$SEED --target vdc --sourcetype file --type disk --driver qemu --subdriver raw --config
virsh console $vmname
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