Growroot with LVM for OpenStack

gistfile1.sh

#!/bin/bash
#
# This file is part of the UniCloud project
#
# Copyright (C) 2013 Unidata S.p.A. (Davide Guerri - d.guerri@rd.unidata.it)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

ROOT_DISK="/dev/vda"
ROOT_PARTITION="/dev/vda3"
VOLUME_GROUP="VolGroup00"
LOGICAL_VOLUME="/dev/$VOLUME_GROUP/LogVol00"

exec >> /var/log/cloud-resize.log 2>&1

log() {
   echo `date` : "$@"
}

# No need to run if ROOT_PARTITION partition is already present
pvs | grep $ROOT_PARTITION
if [ $? -eq 0 ]; then
   log "No need to run"
   exit 0
fi

# Ugly as hell... but parted still can't be used..
read -d '' COMMANDS <<- EOF
n
p
3


t
3
8e
w
EOF

echo "$COMMANDS" | fdisk $ROOT_DISK

partprobe

# Wait for ROOT_PARTITION
count=5
while [ ! -b $ROOT_PARTITION -o $count -eq 0 ]; do
   log "Waiting for partition '$ROOT_PARTITION'"
   sleep 1
   count=$(($count - 1))
done

if [ ! -b $ROOT_PARTITION ]; then
   log "Something went wrong... Can't find partition '$ROOT_PARTITION'"
   exit 1
fi

log "Creating pv"
pvcreate $ROOT_PARTITION
if [ $? -ne 0 ]; then
   log "Problem executing pvcreate"
   # TODO: Rollback
   exit 1
fi

log "extending volume group"
vgextend $VOLUME_GROUP $ROOT_PARTITION
if [ $? -ne 0 ]; then
   log "Problem executing vgextend"
   # TODO: Rollback
   exit 1
fi

log "extending logical volume"
lvextend $LOGICAL_VOLUME $ROOT_PARTITION 
if [ $? -ne 0 ]; then
   log "Problem executing lvextend"
   # TODO: Rollback
   exit 1
fi

log "resizing filesystem"
resize2fs $LOGICAL_VOLUME
if [ $? -ne 0 ]; then
   log "Problem executing resize2fs"
   # TODO: Rollback
   exit 1
fi

log "Done!"