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Add lxc-clone script
Create an lxc-clone script to clone containers. It should probably be factored into helpers and then enhanced, in particular to convert between LVM and non-LVM containers, create non-snapshot LVM clones, support loopback devices, and, when stable enough, to use overlayfs, btrfs, etc. But this is a start. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Serge E. Hallyn
Daniel Lezcano
parent
e2e0ee2501
commit
be8b597242
@ -157,6 +157,7 @@ AC_CONFIG_FILES([
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src/lxc/lxc-setuid
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src/lxc/lxc-version
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src/lxc/lxc-create
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src/lxc/lxc-clone
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src/lxc/lxc-destroy
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])
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@ -78,6 +78,7 @@ rm -rf %{buildroot}
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%{_bindir}/*
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%attr(4111,root,root) %{_bindir}/lxc-attach
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%attr(4111,root,root) %{_bindir}/lxc-create
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%attr(4111,root,root) %{_bindir}/lxc-clone
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%attr(4111,root,root) %{_bindir}/lxc-start
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%attr(4111,root,root) %{_bindir}/lxc-netstat
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%attr(4111,root,root) %{_bindir}/lxc-unshare
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@ -70,6 +70,7 @@ bin_SCRIPTS = \
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lxc-setuid \
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lxc-version \
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lxc-create \
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lxc-clone \
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lxc-destroy
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bin_PROGRAMS = \
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208
src/lxc/lxc-clone.in
Normal file
208
src/lxc/lxc-clone.in
Normal file
@ -0,0 +1,208 @@
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#!/bin/bash
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#
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# lxc: linux Container library
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# Authors:
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# Serge Hallyn <serge.hallyn@ubuntu.com>
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# Daniel Lezcano <daniel.lezcano@free.fr>
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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usage() {
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echo "usage: lxc-clone -o <orig> -n <new> [-s] [-h] [-L fssize] [-v vgname]"
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}
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help() {
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usage
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echo
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echo "creates a lxc system object."
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echo
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echo "Options:"
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echo "orig : name of the original container"
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echo "new : name of the new container"
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echo "-s : make the new rootfs a snapshot of the original"
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echo "fssize : size if creating a new fs. By default, 2G"
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echo "vgname : lvm volume group name, lxc by default"
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}
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shortoptions='ho:n:sL:v:'
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longoptions='help,orig:,name:,snapshot,fssize,vgname'
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lxc_path=/var/lib/lxc
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bindir=/usr/bin
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snapshot=no
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lxc_size=2G
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lxc_vg=lxc
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getopt=$(getopt -o $shortoptions --longoptions $longoptions -- "$@")
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if [ $? != 0 ]; then
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usage
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exit 1;
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fi
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eval set -- "$getopt"
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while true; do
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case "$1" in
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-h|--help)
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help
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exit 1
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;;
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-s|--snapshot)
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shift
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snapshot=yes
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;;
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-o|--orig)
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shift
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lxc_orig=$1
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shift
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;;
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-L|--fssize)
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shift
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lxc_size=$1
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shift
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;;
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-v|--vgname)
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shift
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lxc_vg=$1
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shift
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;;
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-n|--new)
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shift
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lxc_new=$1
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shift
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;;
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--)
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shift
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break;;
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*)
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echo $1
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usage
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exit 1
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;;
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esac
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done
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if [ -z "$lxc_path" ]; then
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echo "no configuration path defined !"
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exit 1
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fi
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if [ ! -r $lxc_path ]; then
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echo "configuration path '$lxc_path' not found"
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exit 1
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fi
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if [ -z "$lxc_orig" ]; then
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echo "no original container name specified"
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usage
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exit 1
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fi
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if [ -z "$lxc_new" ]; then
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echo "no new container name specified"
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usage
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exit 1
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fi
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if [ "$(id -u)" != "0" ]; then
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echo "This command has to be run as root"
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exit 1
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fi
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if [ ! -r $lxc_path ]; then
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echo "no configuration path defined !"
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exit 1
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fi
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if [ ! -d "$lxc_path/$lxc_orig" ]; then
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echo "'$lxc_orig' does not exist"
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exit 1
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fi
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if [ -d "$lxc_path/$lxc_new" ]; then
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echo "'$lxc_new' already exists"
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exit 1
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fi
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trap "${bindir}/lxc-destroy -n $lxc_new; echo aborted; exit 1" SIGHUP SIGINT SIGTERM
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mkdir -p $lxc_path/$lxc_new
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echo "Tweaking configuration"
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cp $lxc_path/$lxc_orig/config $lxc_path/$lxc_new/config
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sed -i '/lxc.utsname/d' $lxc_path/$lxc_new/config
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echo "lxc.utsname = $hostname" >> $lxc_path/$lxc_new/config
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sed -i '/lxc.mount/d' $lxc_path/$lxc_new/config
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echo "lxc.mount = $lxc_path/$lxc_new/fstab" >> $lxc_path/$lxc_new/config
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cp $lxc_path/$lxc_orig/fstab $lxc_path/$lxc_new/fstab
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sed -i "s@$lxc_path/$lxc_orig@$lxc_path/$lxc_new@" $lxc_path/$lxc_new/fstab
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echo "Copying rootfs..."
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rootfs=$lxc_path/$lxc_new/rootfs
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# First figure out if the old is a device. For now we only support
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# lvm devices.
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mounted=0
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sed -i '/lxc.rootfs/d' $lxc_path/$lxc_new/config
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oldroot=`grep lxc.rootfs $lxc_path/$lxc_orig/config | awk -F= '{ print $2 '}`
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if [ -b $oldroot ]; then
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# this is a device. If we don't want to snapshot, then mkfs, mount
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# and rsync. Trivial but not yet implemented
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if [ $snapshot == "no" ]; then
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echo "non-snapshot and non-lvm clone of block device not yet implemented"
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exit 1
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fi
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lvdisplay $oldroot > /dev/null 2>&1
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if [ $? -ne 0 ]; then
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echo "non-snapshot and non-lvm clone of block device not yet implemented"
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exit 1
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fi
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# ok, create a snapshot of the lvm device
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lvcreate -s -L $lxc_size -n $lxc_new /dev/$lxc_vg/$lxc_orig || exit 1
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echo "lxc.rootfs = /dev/$lxc_vg/$lxc_new" >> $lxc_path/$lxc_new/config
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# and mount it so we can tweak it
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mkdir -p $lxc_path/$lxc_new/rootfs
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mount /dev/$lxc_vg/$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
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mounted=1
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else
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cp -a $lxc_path/$lxc_orig/rootfs $lxc_path/$lxc_new/rootfs || return 1
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echo "lxc.rootfs = $rootfs" >> $lxc_path/$lxc_new/config
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fi
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echo "Updating rootfs..."
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hostname=$lxc_new
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# so you can 'ssh $hostname.' or 'ssh $hostname.local'
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if [ -f $rootfs/etc/dhcp/dhclient.conf ]; then
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sed -i "s/send host-name.*$/send host-name $hostname/" $rootfs/etc/dhcp/dhclient.conf
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fi
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# set the hostname
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cat <<EOF > $rootfs/etc/hostname
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$hostname
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EOF
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# set minimal hosts
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cat <<EOF > $rootfs/etc/hosts
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127.0.0.1 localhost $hostname
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EOF
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# if this was a block device, then umount it now
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if [ $mounted -eq 1 ]; then
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umount $rootfs
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fi
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echo "'$lxc_new' created"
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