lxc-ubuntu-cloud.in revision a2abaa9ec60a8967611e8c8905698bd01bde5861
49N/A#!/bin/bash
49N/A
49N/A# template script for generating ubuntu container for LXC based on released cloud
49N/A# images
49N/A#
49N/A# Copyright © 2012 Serge Hallyn <serge.hallyn@canonical.com>
49N/A#
49N/A# This program is free software; you can redistribute it and/or modify
49N/A# it under the terms of the GNU General Public License version 2, as
49N/A# published by the Free Software Foundation.
49N/A
49N/A# This program is distributed in the hope that it will be useful,
49N/A# but WITHOUT ANY WARRANTY; without even the implied warranty of
49N/A# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
49N/A# GNU General Public License for more details.
49N/A
49N/A# You should have received a copy of the GNU General Public License along
49N/A# with this program; if not, write to the Free Software Foundation, Inc.,
49N/A# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
49N/A#
49N/A
49N/Aset -e
49N/A
49N/Aif [ -r /etc/default/lxc ]; then
49N/A . /etc/default/lxc
49N/Afi
49N/A
49N/Acopy_configuration()
49N/A{
49N/A path=$1
49N/A rootfs=$2
49N/A name=$3
51N/A arch=$4
51N/A release=$5
51N/A
51N/A if [ $arch = "i386" ]; then
51N/A arch="i686"
49N/A fi
49N/A
49N/A # if there is exactly one veth network entry, make sure it has an
49N/A # associated hwaddr.
49N/A nics=`grep -e '^lxc\.network\.type[ \t]*=[ \t]*veth' $path/config | wc -l`
51N/A if [ $nics -eq 1 ]; then
51N/A grep -q "^lxc.network.hwaddr" $path/config || sed -i -e "/^lxc\.network\.type[ \t]*=[ \t]*veth/a lxc.network.hwaddr = 00:16:3e:$(openssl rand -hex 3| sed 's/\(..\)/\1:/g; s/.$//')" $path/config
51N/A fi
49N/A
49N/A grep -q "^lxc.rootfs" $path/config 2>/dev/null || echo "lxc.rootfs = $rootfs" >> $path/config
49N/A cat <<EOF >> $path/config
51N/Alxc.mount = $path/fstab
49N/Alxc.pivotdir = lxc_putold
49N/A
49N/Alxc.devttydir =$ttydir
51N/Alxc.tty = 4
49N/Alxc.pts = 1024
51N/A
51N/Alxc.utsname = $name
51N/Alxc.arch = $arch
51N/Alxc.cap.drop = sys_module mac_admin mac_override
51N/A
51N/A# When using LXC with apparmor, uncomment the next line to run unconfined:
51N/A#lxc.aa_profile = unconfined
51N/A
51N/Alxc.cgroup.devices.deny = a
51N/A# Allow any mknod (but not using the node)
51N/Alxc.cgroup.devices.allow = c *:* m
51N/Alxc.cgroup.devices.allow = b *:* m
51N/A# /dev/null and zero
49N/Alxc.cgroup.devices.allow = c 1:3 rwm
49N/Alxc.cgroup.devices.allow = c 1:5 rwm
49N/A# consoles
49N/Alxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 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
# rtc
lxc.cgroup.devices.allow = c 254:0 rwm
# fuse
lxc.cgroup.devices.allow = c 10:229 rwm
# tun
lxc.cgroup.devices.allow = c 10:200 rwm
# full
lxc.cgroup.devices.allow = c 1:7 rwm
# hpet
lxc.cgroup.devices.allow = c 10:228 rwm
# kvm
lxc.cgroup.devices.allow = c 10:232 rwm
EOF
cat <<EOF > $path/fstab
proc proc proc nodev,noexec,nosuid 0 0
sysfs sys sysfs defaults 0 0
EOF
# rmdir /dev/shm for containers that have /run/shm
# I'm afraid of doing rm -rf $rootfs/dev/shm, in case it did
# get bind mounted to the host's /run/shm. So try to rmdir
# it, and in case that fails move it out of the way.
if [ ! -L $rootfs/dev/shm ] && [ -d $rootfs/run/shm ] && [ -e $rootfs/dev/shm ]; then
mv $rootfs/dev/shm $rootfs/dev/shm.bak
ln -s /run/shm $rootfs/dev/shm
fi
return 0
}
usage()
{
cat <<EOF
LXC Container configuration for Ubuntu Cloud images.
Generic Options
[ -r | --release <release> ]: Release name of container, defaults to host
[ -a | --arch ]: Arhcitecture of container, defaults to host arcitecture
[ -C | --cloud ]: Configure container for use with meta-data service, defaults to no
[ -T | --tarball ]: Location of tarball
[ -d | --debug ]: Run with 'set -x' to debug errors
[ -s | --stream]: Use specified stream rather than 'released'
Options, mutually exclusive of "-C" and "--cloud":
[ -i | --hostid ]: HostID for cloud-init, defaults to random string
[ -u | --userdata ]: Cloud-init user-data file to configure container on start
[ -S | --auth-key ]: SSH Public key file to inject into container
[ -L | --nolocales ]: Do not copy host's locales into container
EOF
return 0
}
options=$(getopt -o a:hp:r:n:Fi:CLS:T:ds:u: -l arch:,help,path:,release:,name:,flush-cache,hostid:,auth-key:,cloud,no_locales,tarball:,debug,stream:,userdata: -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
fi
eval set -- "$options"
release=lucid
if [ -f /etc/lsb-release ]; then
. /etc/lsb-release
case "$DISTRIB_CODENAME" in
lucid|natty|oneiric|precise|quantal)
release=$DISTRIB_CODENAME
;;
esac
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=$(uname -m)
if [ "$arch" = "i686" ]; then
arch="i386"
elif [ "$arch" = "x86_64" ]; then
arch="amd64"
elif [ "$arch" = "armv7l" ]; then
# note: arm images don't exist before oneiric; are called armhf in
# precise and later; and are not supported by the query, so we don't actually
# support them yet (see check later on). When Query2 is available,
# we'll use that to enable arm images.
arch="armhf"
fi
fi
debug=0
hostarch=$arch
cloud=0
locales=1
flushcache=0
stream="released"
while true
do
case "$1" in
-h|--help) usage $0 && exit 0;;
-p|--path) path=$2; shift 2;;
-n|--name) name=$2; shift 2;;
-F|--flush-cache) flushcache=1; shift 1;;
-r|--release) release=$2; shift 2;;
-a|--arch) arch=$2; shift 2;;
-i|--hostid) host_id=$2; shift 2;;
-u|--userdata) userdata=$2; shift 2;;
-C|--cloud) cloud=1; shift 1;;
-S|--auth-key) auth_key=$2; shift 2;;
-L|--no_locales) locales=0; shift 1;;
-T|--tarball) tarball=$2; shift 2;;
-d|--debug) debug=1; shift 1;;
-s|--stream) stream=$2; shift 2;;
--) shift 1; break ;;
*) break ;;
esac
done
if [ $debug -eq 1 ]; then
set -x
fi
if [ "$arch" == "i686" ]; then
arch=i386
fi
if [ $arch != "i386" -a $arch != "amd64" -a $arch != "armhf" -a $arch != "armel" ]; then
echo "Only i386, amd64, armel and armhf are supported by the ubuntu cloud template."
exit 1
fi
if [ $hostarch != "i386" -a $hostarch != "amd64" -a $hostarch != "armhf" -a $hostarch != "armel" ]; then
echo "Only i386, amd64, armel and armhf are supported as host."
exit 1
fi
if [ $hostarch = "amd64" -a $arch != "amd64" -a $arch != "i386" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
if [ $hostarch = "i386" -a $arch != "i386" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
if [ $hostarch = "armhf" -o $hostarch = "armel" ] && \
[ $arch != "armhf" -a $arch != "armel" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
if [ "$stream" != "daily" -a "$stream" != "released" ]; then
echo "Only 'daily' and 'released' streams are supported"
exit 1
fi
if [ -n "$userdata" ]; then
if [ ! -f "$userdata" ]; then
echo "Userdata ($userdata) does not exist"
exit 1
else
userdata=`readlink -f $userdata`
fi
fi
if [ -n "$auth_key" ]; then
if [ ! -f "$auth_key" ]; then
echo "--auth-key=${auth_key} must reference a file"
exit 1
fi
auth_key=$(readlink -f "${auth_key}") ||
{ echo "failed to get full path for auth_key"; 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
# detect rootfs
config="$path/config"
if grep -q '^lxc.rootfs' $config 2>/dev/null ; then
rootfs=`grep 'lxc.rootfs =' $config | awk -F= '{ print $2 }'`
else
rootfs=$path/rootfs
fi
type ubuntu-cloudimg-query
type wget
# determine the url, tarball, and directory names
# download if needed
cache="@LOCALSTATEDIR@/cache/lxc/cloud-$release"
mkdir -p $cache
if [ -n "$tarball" ]; then
url2="$tarball"
else
url1=`ubuntu-cloudimg-query $release $stream $arch --format "%{url}\n"`
url2=`echo $url1 | sed -e 's/.tar.gz/-root\0/'`
fi
filename=`basename $url2`
wgetcleanup()
{
rm -f $filename
}
buildcleanup()
{
cd $rootfs
umount -l $cache/$xdir || true
rm -rf $cache
}
# if the release doesn't have a *-rootfs.tar.gz, then create one from the
# cloudimg.tar.gz by extracting the .img, mounting it loopback, and creating
# a tarball from the mounted image.
build_root_tgz()
{
url=$1
filename=$2
xdir=`mktemp -d -p .`
tarname=`basename $url`
imgname="$release-*-cloudimg-$arch.img"
trap buildcleanup EXIT SIGHUP SIGINT SIGTERM
if [ $flushcache -eq 1 -o ! -f $cache/$tarname ]; then
rm -f $tarname
echo "Downloading cloud image from $url"
wget $url || { echo "Couldn't find cloud image $url."; exit 1; }
fi
echo "Creating new cached cloud image rootfs"
tar --wildcards -zxf $tarname $imgname
mount -o loop $imgname $xdir
(cd $xdir; tar zcf ../$filename .)
umount $xdir
rm -f $tarname $imgname
rmdir $xdir
echo "New cloud image cache created"
trap EXIT
trap SIGHUP
trap SIGINT
trap SIGTERM
}
mkdir -p @LOCALSTATEDIR@/lock/subsys/
(
flock -x 200
cd $cache
if [ $flushcache -eq 1 ]; then
echo "Clearing the cached images"
rm -f $filename
fi
trap wgetcleanup EXIT SIGHUP SIGINT SIGTERM
if [ ! -f $filename ]; then
wget $url2 || build_root_tgz $url1 $filename
fi
trap EXIT
trap SIGHUP
trap SIGINT
trap SIGTERM
echo "Extracting container rootfs"
mkdir -p $rootfs
cd $rootfs
tar -zxf $cache/$filename
if [ $cloud -eq 0 ]; then
echo "Configuring for running outside of a cloud environment"
echo "If you want to configure for a cloud evironment, please use '-- -C' to create the container"
seed_d=$rootfs/var/lib/cloud/seed/nocloud-net
rhostid=$(uuidgen | cut -c -8)
host_id=${hostid:-$rhostid}
mkdir -p $seed_d
cat > "$seed_d/meta-data" <<EOF
instance-id: lxc-$host_id
EOF
if [ -n "$auth_key" ]; then
{
echo "public-keys:" &&
sed -e '/^$/d' -e 's,^,- ,' "$auth_key" "$auth_key"
} >> "$seed_d/meta-data"
[ $? -eq 0 ] ||
{ echo "failed to write public keys to metadata"; exit 1; }
fi
rm $rootfs/etc/hostname
if [ $locales -eq 1 ]; then
cp /usr/lib/locale/locale-archive $rootfs/usr/lib/locale/locale-archive
fi
if [ -f "$userdata" ]; then
echo "Using custom user-data"
cp $userdata $seed_d/user-data
else
if [ -z "$MIRROR" ]; then
MIRROR="http://archive.ubuntu.com/ubuntu"
fi
cat > "$seed_d/user-data" <<EOF
#cloud-config
output: {all: '| tee -a /var/log/cloud-init-output.log'}
apt_mirror: $MIRROR
manage_etc_hosts: localhost
locale: $(/usr/bin/locale | awk -F= '/LANG=/ {print$NF}')
password: ubuntu
chpasswd: { expire: False }
EOF
fi
else
echo "Configured for running in a cloud environment."
echo "If you do not have a meta-data service, this container will likely be useless."
fi
) 200>@LOCALSTATEDIR@/lock/subsys/lxc-ubuntu-cloud
copy_configuration $path $rootfs $name $arch $release
echo "Container $name created."
exit 0
# vi: ts=4 expandtab