#!/bin/bash # # lxc: linux Container library # Authors: # Serge Hallyn # Daniel Lezcano # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # This library 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 # Lesser General Public License for more details. # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA usage() { echo "usage: lxc-clone -o -n [-s] [-h] [-L fssize] [-v vgname] [-p lxc_lv_prefix] [-t fstype]" } help() { usage echo echo "creates a lxc system object." echo echo "Options:" echo "orig : name of the original container" echo "new : name of the new container" 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:p:t:' longoptions='help,orig:,name:,snapshot,fssize:,vgname:,lvprefix:,fstype:' localstatedir=@LOCALSTATEDIR@ lxc_path=@LXCPATH@ bindir=@BINDIR@ snapshot=no lxc_size=2G lxc_vg=lxc lxc_lv_prefix="" fstype=ext3 getopt=$(getopt -o $shortoptions --longoptions $longoptions -- "$@") if [ $? != 0 ]; then usage exit 1; fi eval set -- "$getopt" while true; do case "$1" in -h|--help) help exit 1 ;; -s|--snapshot) shift snapshot=yes snapshot_opt="-s" ;; -o|--orig) shift lxc_orig=$1 shift ;; -L|--fssize) shift lxc_size=$1 shift ;; -v|--vgname) shift lxc_vg=$1 shift ;; -n|--new) shift lxc_new=$1 shift ;; -p|--lvprefix) shift lxc_lv_prefix=$1 shift ;; --) shift break;; *) echo $1 usage exit 1 ;; esac done if [ -z "$lxc_path" ]; then echo "no configuration path defined !" exit 1 fi if [ ! -r $lxc_path ]; then echo "configuration path '$lxc_path' not found" exit 1 fi if [ -z "$lxc_orig" ]; then echo "no original container name specified" usage exit 1 fi if [ -z "$lxc_new" ]; then echo "no new container name specified" usage exit 1 fi if [ "$(id -u)" != "0" ]; then echo "This command has to be run as root" exit 1 fi if [ ! -r $lxc_path ]; then echo "no configuration path defined !" exit 1 fi if [ ! -d "$lxc_path/$lxc_orig" ]; then echo "'$lxc_orig' does not exist" exit 1 fi if [ -d "$lxc_path/$lxc_new" ]; then echo "'$lxc_new' already exists" exit 1 fi trap "${bindir}/lxc-destroy -n $lxc_new; echo aborted; exit 1" SIGHUP SIGINT SIGTERM 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 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; } 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 else container_running=False 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 lvdisplay $oldroot > /dev/null 2>&1 if [ $? -ne 0 ]; then 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 if [ $container_running == "True" ]; then lxc-freeze -n $lxc_orig fi lvcreate -s -L $lxc_size -n ${lxc_lv_prefix}${lxc_new}_snapshot $oldroot RETVAL=$? if [ $container_running == "True" ]; then lxc-unfreeze -n $lxc_orig fi if [ $RETVAL -ne 0 ]; then echo "snapshot creation failed" exit 1 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 if [ $container_running == True ];then lxc-freeze -n $lxc_orig fi rsync -ax $lxc_path/$lxc_orig/rootfs $lxc_path/$lxc_new/rootfs RETVAL=$? if [ $container_running == True ];then lxc-unfreeze -n $lxc_orig fi if [ RETVAL -ne 0 ]; then echo "copying rootfs failed" exit 1 fi echo "lxc.rootfs = $rootfs" >> $lxc_path/$lxc_new/config fi echo "Updating rootfs..." # so you can 'ssh $hostname.' or 'ssh $hostname.local' if [ -f $rootfs/etc/dhcp/dhclient.conf ]; then sed -i "s/send host-name.*$/send host-name \"$hostname\";/" $rootfs/etc/dhcp/dhclient.conf fi # set the hostname cat < $rootfs/etc/hostname $hostname EOF # set minimal hosts cat < $rootfs/etc/hosts 127.0.0.1 localhost $hostname EOF # if this was a block device, then umount it now if [ $mounted -eq 1 ]; then umount $rootfs fi echo "'$lxc_new' created"