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lxc template for debian wheezy to install on Ubuntu precise 12.04 host
#!/bin/bash
#
# lxc: linux Container library
# Authors:
# Daniel Lezcano <daniel.lezcano@free.fr>
# 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
DEBIANVERSION=wheezy
SUITE=debian-${DEBIANVERSION}
MIRROR=${MIRROR:-http://cdn.debian.net/debian}
configure_debian()
{
rootfs=$1
hostname=$2
fqdn=$3
# squeeze only has /dev/tty and /dev/tty0 by default,
# therefore creating missing device nodes for tty1-4.
for tty in $(seq 1 4); do
if [ ! -e $rootfs/dev/tty$tty ]; then
mknod $rootfs/dev/tty$tty c 4 $tty
fi
done
# configure the inittab
cat <<EOF > $rootfs/etc/inittab
id:2:initdefault:
si::sysinit:/etc/init.d/rcS
l0:0:wait:/etc/init.d/rc 0
l1:1:wait:/etc/init.d/rc 1
l2:2:wait:/etc/init.d/rc 2
l3:3:wait:/etc/init.d/rc 3
l4:4:wait:/etc/init.d/rc 4
l5:5:wait:/etc/init.d/rc 5
l6:6:wait:/etc/init.d/rc 6
# Normally not reached, but fallthrough in case of emergency.
z6:6:respawn:/sbin/sulogin
1:2345:respawn:/sbin/getty 38400 console
c1:12345:respawn:/sbin/getty 38400 tty1 linux
c2:12345:respawn:/sbin/getty 38400 tty2 linux
c3:12345:respawn:/sbin/getty 38400 tty3 linux
c4:12345:respawn:/sbin/getty 38400 tty4 linux
EOF
# disable selinux in debian
mkdir -p $rootfs/selinux
echo 0 > $rootfs/selinux/enforce
# configure the network using the dhcp
cat <<EOF > $rootfs/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
EOF
# set the hostname
cat <<EOF > $rootfs/etc/hostname
$hostname
EOF
# set minimal hosts
cat <<EOF > $rootfs/etc/hosts
127.0.0.1 $fqdn $hostname localhost
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
EOF
# reconfigure some services
LANG="${LANG:-en_US.UTF-8}"
locale="$LANG $(echo $LANG | cut -d. -f2)"
chroot $rootfs echo "locales locales/default_environment_locale select $LANG" | chroot $rootfs sh -c "LANG=C debconf-set-selections"
chroot $rootfs echo "locales locales/default_environment_locale seen true" | chroot $rootfs sh -c "LANG=C debconf-set-selections"
chroot $rootfs echo "locales locales/locales_to_be_generated seen true" | chroot $rootfs sh -c "LANG=C debconf-set-selections"
chroot $rootfs sed -i -e "0,/^[# ]*$locale *$/ s/^[# ]*$locale *$/$locale/" /etc/locale.gen
chroot $rootfs sh -c "LANG=C dpkg-reconfigure locales -f noninteractive"
# remove pointless services in a container
chroot $rootfs /usr/sbin/update-rc.d -f checkroot.sh remove # S
chroot $rootfs /usr/sbin/update-rc.d checkroot.sh stop 09 S .
chroot $rootfs /usr/sbin/update-rc.d -f umountfs remove # 0 6
chroot $rootfs /usr/sbin/update-rc.d umountfs start 09 0 6 .
chroot $rootfs /usr/sbin/update-rc.d -f umountroot remove # 0 6
chroot $rootfs /usr/sbin/update-rc.d umountroot start 10 0 6 .
# The following initscripts don't provide an empty start or stop block.
# To prevent them being enabled on upgrades, we leave a start link on
# runlevel 3.
chroot $rootfs /usr/sbin/update-rc.d -f hwclock.sh remove # S 0 6
chroot $rootfs /usr/sbin/update-rc.d hwclock.sh start 10 3 .
chroot $rootfs /usr/sbin/update-rc.d -f hwclockfirst.sh remove # S
chroot $rootfs /usr/sbin/update-rc.d hwclockfirst start 08 3 .
chroot $rootfs /usr/sbin/update-rc.d -f module-init-tools remove # S
chroot $rootfs /usr/sbin/update-rc.d module-init-tools start 10 3 .
echo "root:root" | chroot $rootfs chpasswd
echo "Root password is 'root', please change !"
return 0
}
cleanup()
{
rm -rf $cache/partial-$SUITE-$arch
rm -rf $cache/rootfs-$SUITE-$arch
}
download_debian()
{
packages=\
ifupdown,\
locales,\
libui-dialog-perl,\
dialog,\
isc-dhcp-client,\
netbase,\
net-tools,\
iproute,\
openssh-server
cache=$1
arch=$2
trap cleanup EXIT SIGHUP SIGINT SIGTERM
# check the mini debian was not already downloaded
mkdir -p "$cache/partial-$SUITE-$arch"
if [ $? -ne 0 ]; then
echo "Failed to create '$cache/partial-$SUITE-$arch' directory"
return 1
fi
# download a mini debian into a cache
echo "Downloading debian minimal ..."
debootstrap --verbose --variant=minbase --arch=$arch \
--include=$packages \
"$DEBIANVERSION" "$cache/partial-$SUITE-$arch" $MIRROR
if [ $? -ne 0 ]; then
echo "Failed to download the rootfs, aborting."
return 1
fi
mv "$1/partial-$SUITE-$arch" "$1/rootfs-$SUITE-$arch"
echo "Download complete."
trap EXIT
trap SIGINT
trap SIGTERM
trap SIGHUP
return 0
}
copy_debian()
{
cache=$1
arch=$2
rootfs=$3
# make a local copy of the minidebian
echo -n "Copying rootfs to $rootfs..."
mkdir -p $rootfs
rsync -a "$cache/rootfs-$SUITE-$arch"/ $rootfs/ || return 1
return 0
}
install_debian()
{
cache="/var/cache/lxc/"$SUITE
rootfs=$1
mkdir -p /var/lock/subsys/
(
flock -x 200
if [ $? -ne 0 ]; then
echo "Cache repository is busy."
return 1
fi
# Code taken from debootstrap
if [ -x /usr/bin/dpkg ] && /usr/bin/dpkg --print-architecture >/dev/null 2>&1; then
arch=`/usr/bin/dpkg --print-architecture`
elif type udpkg >/dev/null 2>&1 && udpkg --print-architecture >/dev/null 2>&1; then
arch=`/usr/bin/udpkg --print-architecture`
else
arch=$(arch)
case $arch in
686) arch="i386";;
x86_64) arch="amd64";;
ppc) arch="powerpc";;
esac
fi
echo "Checking cache download in $cache/rootfs-$SUITE-$arch ... "
if [ ! -e "$cache/rootfs-$SUITE-$arch" ]; then
download_debian $cache $arch
if [ $? -ne 0 ]; then
echo "Failed to download 'debian base'"
return 1
fi
fi
copy_debian $cache $arch $rootfs
if [ $? -ne 0 ]; then
echo "Failed to copy rootfs"
return 1
fi
return 0
) 200>/var/lock/subsys/lxc
return $?
}
copy_configuration()
{
path=$1
rootfs=$2
name=$3
fqdn=$4
ipaddress=$5
cat >> $path/config << EOF
# $path/config
## Container
lxc.utsname = $fqdn
lxc.rootfs = $rootfs
lxc.tty = 4
lxc.pts = 1024
lxc.mount = /var/lib/lxc/$name/fstab
lxc.network.ipv4 = $ipaddress
#lxc.console = /var/log/lxc/$name.console
## Capabilities
lxc.cap.drop = sys_admin
# uncomment the next line to run the container unconfined:
#lxc.aa_profile = unconfined
## Devices
#lxc.cgroup.devices.allow = a
lxc.cgroup.devices.deny = a
# /dev/null
lxc.cgroup.devices.allow = c 1:3 rwm
# /dev/zero
lxc.cgroup.devices.allow = c 1:5 rwm
# /dev/tty[1-4] consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/{,u}random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
# /dev/rtc
lxc.cgroup.devices.allow = c 254:0 rwm
## Limits
#lxc.cgroup.cpu.shares = 1024
#lxc.cgroup.cpuset.cpus = 0
#lxc.cgroup.memory.limit_in_bytes = 256M
#lxc.cgroup.memory.memsw.limit_in_bytes = 1G
## Filesystem
#lxc.mount.entry = proc proc proc nodev,noexec,nosuid 0 0
#lxc.mount.entry = sysfs sys sysfs defaults,ro 0 0
#lxc.mount.entry = /srv/$name srv/$name none defaults,bind 0 0
EOF
if [ -z "$ipaddress" ]; then
sed -i 's/^lxc\.network\.ipv4/#lxc.network.ipv4/g' $path/config
fi
cat <<EOF > $path/fstab
proc proc proc nodev,noexec,nosuid 0 0
sysfs sys sysfs defaults,ro 0 0
tmpfs /var/lib/lxc/$name/rootfs/run/shm tmpfs rw,nosuid,nodev,noexec 0 0
EOF
if [ $? -ne 0 ]; then
echo "Failed to add configuration"
return 1
fi
return 0
}
clean()
{
cache="/var/cache/lxc/debian"
if [ ! -e $cache ]; then
exit 0
fi
# lock, so we won't purge while someone is creating a repository
(
flock -x 200
if [ $? != 0 ]; then
echo "Cache repository is busy."
exit 1
fi
echo -n "Purging the download cache..."
rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1
exit 0
) 200>/var/lock/subsys/lxc
}
usage()
{
cat <<EOF
$1 -h|--help -p|--path=<path>|--fqdn=<fully qualified hostname>|--ip=<static ip address> --clean
EOF
return 0
}
options=$(getopt -o hp:n:c -l help,path:,name:,ip:,clean,fqdn: -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
fi
eval set -- "$options"
while true
do
case "$1" in
-h|--help) usage $0 && exit 0;;
-p|--path) path=$2; shift 2;;
--fqdn) fqdn=$2; shift 2;;
--ip) ipaddress=$2; shift 2;;
-n|--name) name=$2; shift 2;;
-c|--clean) clean=$2; shift 2;;
--) shift 1; break ;;
*) break ;;
esac
done
if [ ! -z "$clean" -a -z "$path" ]; then
clean || exit 1
exit 0
fi
if [ -z "$fqdn" ]; then
fqdn=$name;
fi
type debootstrap
if [ $? -ne 0 ]; then
echo "'debootstrap' command is missing"
exit 1
fi
if [ -z "$path" ]; then
echo "'path' parameter is required"
exit 1
fi
if [ "$(id -u)" != "0" ]; then
echo "This script should be run as 'root'"
exit 1
fi
rootfs=$path/rootfs
install_debian $rootfs
if [ $? -ne 0 ]; then
echo "failed to install debian"
exit 1
fi
configure_debian $rootfs $name $fqdn
if [ $? -ne 0 ]; then
echo "failed to configure debian for a container"
exit 1
fi
copy_configuration $path $rootfs $name $fqdn $ipaddress
if [ $? -ne 0 ]; then
echo "failed write configuration file"
exit 1
fi
if [ ! -z $clean ]; then
clean || exit 1
exit 0
fi
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