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Commit 27078f44 by InformatiQ Committed by Daniel Lezcano
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* allow cloning of non-snapshot lvm devices

Signed-off-by: 's avatarInformatiQ <rhanna@informatiq.org> Signed-off-by: 's avatarDaniel Lezcano <dlezcano@fr.ibm.com> Acked-by: 's avatarSerge Hallyn <serge.hallyn@canonical.com>
parent 29ec8f84
Showing with 74 additions and 22 deletions
src/lxc/lxc-clone.in
......@@ -22,7 +22,7 @@
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
usage() {
echo "usage: lxc-clone -o <orig> -n <new> [-s] [-h] [-L fssize] [-v vgname]"
echo "usage: lxc-clone -o <orig> -n <new> [-s] [-h] [-L fssize] [-v vgname] [-p lxc_lv_prefix] [-t fstype]"
}
help() {
......@@ -36,15 +36,19 @@ help() {
echo "-s : make the new rootfs a snapshot of the original"
echo "fssize : size if creating a new fs. By default, 2G"
echo "vgname : lvm volume group name, lxc by default"
echo "lvprefix" : lvm volume name prefix, none by default, e.g. --lvprefix=lxc_ then new lxc lv name will be lxc_newname"
echo "fstype" : new container file system type, ext3 by default (only works for non-snapshot lvm)"
}
shortoptions='ho:n:sL:v:'
longoptions='help,orig:,name:,snapshot,fssize,vgname'
shortoptions='ho:n:sL:v:p:t:'
longoptions='help,orig:,name:,snapshot,fssize:,vgname:,lvprefix:,fstype:'
lxc_path=/var/lib/lxc
bindir=/usr/bin
snapshot=no
lxc_size=2G
lxc_vg=lxc
lxc_lv_prefix=""
fstype=ext3
getopt=$(getopt -o $shortoptions --longoptions $longoptions -- "$@")
if [ $? != 0 ]; then
......@@ -63,6 +67,7 @@ while true; do
-s|--snapshot)
shift
snapshot=yes
snapshot_opt="-s"
;;
-o|--orig)
shift
......@@ -84,6 +89,11 @@ while true; do
lxc_new=$1
shift
;;
-p|--lvprefix)
shift
lxc_lv_prefix=$1
shift
;;
--)
shift
break;;
......@@ -141,50 +151,92 @@ trap "${bindir}/lxc-destroy -n $lxc_new; echo aborted; exit 1" SIGHUP SIGINT SIG
mkdir -p $lxc_path/$lxc_new
hostname=$lxc_new
echo "Tweaking configuration"
cp $lxc_path/$lxc_orig/config $lxc_path/$lxc_new/config
sed -i '/lxc.utsname/d' $lxc_path/$lxc_new/config
echo "lxc.utsname = $hostname" >> $lxc_path/$lxc_new/config
sed -i '/lxc.mount/d' $lxc_path/$lxc_new/config
echo "lxc.mount = $lxc_path/$lxc_new/fstab" >> $lxc_path/$lxc_new/config
grep "lxc.mount =" $lxc_path/$lxc_new/config >/dev/null 2>&1 && { sed -i '/lxc.mount =/d' $lxc_path/$lxc_new/config; echo "lxc.mount = $lxc_path/$lxc_new/fstab" >> $lxc_path/$lxc_new/config; }
cp $lxc_path/$lxc_orig/fstab $lxc_path/$lxc_new/fstab
sed -i "s@$lxc_path/$lxc_orig@$lxc_path/$lxc_new@" $lxc_path/$lxc_new/fstab
if [ -e $lxc_path/$lxc_orig/fstab ];then
cp $lxc_path/$lxc_orig/fstab $lxc_path/$lxc_new/fstab
sed -i "s@$lxc_path/$lxc_orig@$lxc_path/$lxc_new@" $lxc_path/$lxc_new/fstab
fi
echo "Copying rootfs..."
rootfs=$lxc_path/$lxc_new/rootfs
# First figure out if the old is a device. For now we only support
# lvm devices.
mounted=0
#is container running
lxc-info -s -n $lxc_orig|grep RUNNING >/dev/null 2>&1
if [ $? -ne 0 ]; then
container_running=True
fi
sed -i '/lxc.rootfs/d' $lxc_path/$lxc_new/config
oldroot=`grep lxc.rootfs $lxc_path/$lxc_orig/config | awk -F= '{ print $2 '}`
if [ -b $oldroot ]; then
# this is a device. If we don't want to snapshot, then mkfs, mount
# and rsync. Trivial but not yet implemented
if [ $snapshot == "no" ]; then
echo "non-snapshot and non-lvm clone of block device not yet implemented"
exit 1
fi
#if [ $snapshot == "no" ]; then
# echo "non-snapshot and non-lvm clone of block device not yet implemented"
# exit 1
#fi
lvdisplay $oldroot > /dev/null 2>&1
if [ $? -ne 0 ]; then
echo "non-snapshot and non-lvm clone of block device not yet implemented"
exit 1
fi
lvm=False
echo "non-lvm block device cloning not yet implemented"
exit 1
else
lvm=TRUE
fi
# ok, create a snapshot of the lvm device
lvcreate -s -L $lxc_size -n $lxc_new /dev/$lxc_vg/$lxc_orig || exit 1
echo "lxc.rootfs = /dev/$lxc_vg/$lxc_new" >> $lxc_path/$lxc_new/config
# and mount it so we can tweak it
mkdir -p $lxc_path/$lxc_new/rootfs
mount /dev/$lxc_vg/$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
mounted=1
if [ $container_running == "True" ]; then
lxc-freeze -n $lxc_orig
fi
lvcreate -s -L $lxc_size -n ${lxc_lv_prefix}${lxc_new}_snapshot $oldroot || exit 1
if [ $container_running == "True" ]; then
lxc-unfreeze -n $lxc_orig
fi
if [ $snapshot == "no" ]; then
#mount snapshot
mkdir -p ${rootfs}_snapshot
mount /dev/$lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot ${rootfs}_snapshot || { echo "failed to mount new rootfs_snapshot"; exit 1; }
#create a new lv
lvcreate -L $lxc_size $lxc_vg -n ${lxc_lv_prefix}$lxc_new
echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
# and mount it so we can tweak it
mkdir -p $lxc_path/$lxc_new/rootfs
mkfs -t $fstype /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new
mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
mounted=1
rsync -ax ${rootfs}_snapshot/ ${rootfs}/ || { echo "copy of data to new lv failed"; exit 1; }
umount ${rootfs}_snapshot || { echo "failed to unmount new rootfs_snapshot"; exit 1; }
rm -rf ${rootfs}_snapshot
lvremove -f $lxc_vg/${lxc_lv_prefix}$lxc_new || echo "failed to remove the snapshot"
else
lvrename $lxc_vg/${lxc_lv_prefix}}${lxc_new}_snapshot $lxc_vg/${lxc_lv_prefix}$lxc_new
echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
# and mount it so we can tweak it
mkdir -p $lxc_path/$lxc_new/rootfs
mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
mounted=1
fi
else
cp -a $lxc_path/$lxc_orig/rootfs $lxc_path/$lxc_new/rootfs || return 1
if [ $container_running == True ];then
lxc-freeze -n $lxc_orig
fi
rsync -ax $lxc_path/$lxc_orig/rootfs $lxc_path/$lxc_new/rootfs || return 1
if [ $container_running == True ];then
lxc-unfreeze -n $lxc_orig
fi
echo "lxc.rootfs = $rootfs" >> $lxc_path/$lxc_new/config
fi
echo "Updating rootfs..."
hostname=$lxc_new
# so you can 'ssh $hostname.' or 'ssh $hostname.local'
if [ -f $rootfs/etc/dhcp/dhclient.conf ]; then
......
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