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Commit fb7460fe by Daniel Lezcano Committed by Daniel Lezcano
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cleanup lxc-debian script

The lxc-debian is epurated and consolidated with a better error handling. This script is no longer interactive but it installs in a specified place the debian rootfs. This script is not supposed to be called directly so it will fall in libexec path very soon. This script is called by lxc-create as a template with the right option and the right place. The debian network configuration is by dhcp. Signed-off-by: 's avatarDaniel Lezcano <dlezcano@fr.ibm.com>
parent 1d6b1976
Showing with 224 additions and 327 deletions
scripts/lxc-debian.in
#!/bin/bash
# set -ex
CACHE="@LOCALSTATEDIR@/cache/lxc/debian"
NAME="debian"
CONFFILE="lxc.conf"
MNTFILE=
TMPMNTFILE=
UTSNAME=
IPV4="172.20.0.21"
GATEWAY="172.20.0.1"
MTU="1500"
# These paths are within the container so do not need to obey configure prefixes
INTERFACES="/etc/network/interfaces"
INITTAB="/etc/inittab"
HOSTNAME="/etc/hostname"
FSTAB="/etc/fstab"
SSHD_CONFIG="/etc/ssh/sshd_config"
PROFILE="/etc/profile"
################################################################################
# debian custom configuration files
################################################################################
# custom selinux
write_debian_selinux() {
mkdir -p $ROOTFS/selinux
echo 0 > $ROOTFS/selinux/enforce
}
# custom fstab
#
# lxc: linux Container library
write_debian_fstab() {
cat <<EOF > $ROOTFS/$FSTAB
tmpfs /dev/shm tmpfs defaults 0 0
EOF
}
# 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.
# custom inittab
# 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
write_debian_inittab() {
cat <<EOF > $ROOTFS/$INITTAB
configure_debian()
{
rootfs=$1
hostname=$2
# configure the inittab
cat <<EOF > $rootfs/etc/inittab
id:3:initdefault:
si::sysinit:/etc/init.d/rcS
l0:0:wait:/etc/init.d/rc 0
......@@ -60,35 +44,13 @@ 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
}
# custom network configuration
write_debian_network() {
cat <<EOF > $ROOTFS/$INTERFACES
auto eth0 lo
iface eth0 inet static
address $IPV4
netmask 255.255.255.0
broadcast 0.0.0.0
mtu $MTU
up route add default gw $GATEWAY
iface lo inet loopback
EOF
}
# custom hostname
write_debian_hostname() {
cat <<EOF > $ROOTFS/$HOSTNAME
$UTSNAME
EOF
}
# disable selinux in debian
mkdir -p $rootfs/selinux
echo 0 > $rootfs/selinux/enforce
# custom sshd configuration file
write_debian_sshd_config() {
cat <<EOF > $ROOTFS/$SSHD_CONFIG
# by default setup root password with no password
cat <<EOF > $rootfs/etc/ssh/sshd_config
Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
......@@ -109,317 +71,252 @@ HostbasedAuthentication no
PermitEmptyPasswords yes
ChallengeResponseAuthentication no
EOF
}
reconfigure_debian_packages() {
chroot $ROOTFS /usr/sbin/dpkg-reconfigure locales
}
disable_debian_services() {
chroot $ROOTFS /usr/sbin/update-rc.d -f umountfs remove
chroot $ROOTFS /usr/sbin/update-rc.d -f hwclock.sh remove
chroot $ROOTFS /usr/sbin/update-rc.d -f hwclockfirst.sh remove
}
################################################################################
# lxc configuration files
################################################################################
# configure the network using the dhcp
cat <<EOF > $rootfs/etc/network/interfaces
auto lo
iface lo inet loopback
write_lxc_configuration() {
cat <<EOF > $CONFFILE
lxc.utsname = $UTSNAME
lxc.tty = 4
lxc.pts = 1024
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = br0
lxc.network.name = eth0
lxc.network.mtu = $MTU
lxc.rootfs = $ROOTFS
lxc.cgroup.devices.deny = a
# /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
# consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/{,u}random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
# rtc
lxc.cgroup.devices.allow = c 254:0 rwm
auto eth0
iface eth0 inet dhcp
EOF
if [ ! -z "$TMPMNTFILE" ]; then
cat $TMPMNTFILE >> $CONFFILE
fi
}
# set the hostname
cat <<EOF > $rootfs/etc/hostname
$hostname
EOF
write_lxc_mounts() {
# reconfigure some services
chroot $rootfs /usr/sbin/dpkg-reconfigure locales
if [ ! -z "$MNTFILE" ]; then
TMPMNTFILE=$(mktemp lxc.$NAME.XXXXXXXXXX)
sed -e 's/^\(.*\)/lxc.mount.entry=&/' $MNTFILE >$TMPMNTFILE
fi
# remove pointless services in a container
chroot $rootfs /usr/sbin/update-rc.d -f umountfs remove
chroot $rootfs /usr/sbin/update-rc.d -f hwclock.sh remove
chroot $rootfs /usr/sbin/update-rc.d -f hwclockfirst.sh remove
}
collect_information() {
# choose a container name, default is 'debian'
echo -n "What is the name for the container ? [$NAME] "
read _NAME_
if [ ! -z "$_NAME_" ]; then
NAME=$_NAME_
fi
# choose a hostname, default is the container name
echo -n "What hostname do you wish for this container ? [$NAME] "
read _UTSNAME_
if [ ! -z "$_UTSNAME_" ]; then
UTSNAME=$_UTSNAME_
else
UTSNAME=$NAME
fi
# choose an ipv4 address, better to choose the same network than
# your host
echo -n "What IP address do you wish for this container ? [$IPV4] "
read _IPV4_
if [ ! -z "$_IPV4_" ]; then
IPV4=$_IPV4_
fi
# choose the gateway ip address
echo -n "What is the gateway IP address ? [$GATEWAY] "
read _GATEWAY_
if [ ! -z "$_GATEWAY_" ]; then
GATEWAY=$_GATEWAY_
fi
# choose the MTU size
echo -n "What is the MTU size ? [$MTU] "
read _MTU_
if [ ! -z "$_MTU_" ]; then
MTU=$_MTU_
download_debian()
{
packages=\
ifupdown,\
locales,\
libui-dialog-perl,\
dialog,\
dhcp-client,\
netbase,\
net-tools,\
iproute,\
openssh-server
cache=$1
arch=$2
# check the mini debian was not already downloaded
mkdir -p "$cache/partial-$arch"
if [ $? -ne 0 ]; then
echo "Failed to create '$cache/partial-$arch' directory"
return 1
fi
ROOTFS="./rootfs.$NAME"
# choose the rootfs
echo -n "Specify the location of the rootfs [$ROOTFS] "
read _ROOTFS_
if [ ! -z "$_ROOTFS_" ]; then
ROOTFS=$_ROOTFS_
# download a mini debian into a cache
echo "Downloading debian minimal ..."
debootstrap --verbose --variant=minbase --arch=$arch \
--include $packages \
lenny $cache/partial-$arch http://ftp.debian.org/debian
if [ $? -ne 0 ]; then
echo "Failed to download the rootfs, aborting."
return 1
fi
echo -n "Specify the location for an extra fstab file [(none)] "
read _MNTFILE_
mv "$1/partial-$arch" "$1/rootfs-$arch"
echo "Download complete."
if [ ! -z "$_MNTFILE_" ]; then
MNTFILE=$_MNTFILE_
fi
return 0
}
install_debian()
copy_debian()
{
# check if the rootfs does already exist
if [ ! -e "$ROOTFS" ]; then
mkdir -p @LOCALSTATEDIR@/lock/subsys/
(
flock -n -x 200
RES=$?
if [ "$RES" != "0" ]; then
echo "Cache repository is busy."
break
fi
echo "Choose your architecture"
select ARCH in amd64 i386; do
echo "Architecture $ARCH selected"
break;
done
# check the mini debian was not already downloaded
echo -n "Checking cache download ..."
if [ ! -e "$CACHE/rootfs-$ARCH" ]; then
echo "not cached"
mkdir -p "$CACHE/partial-$ARCH"
# download a mini debian into a cache
echo "Downloading debian minimal ..."
debootstrap --verbose --variant=minbase --arch=$ARCH \
--include ifupdown,locales,libui-dialog-perl,dialog,apache2,netbase,net-tools,iproute,openssh-server \
lenny $CACHE/partial-$ARCH http://ftp.debian.org/debian
RESULT=$?
if [ "$RESULT" != "0" ]; then
echo "Failed to download the rootfs, aborting."
exit 1
fi
mv "$CACHE/partial-$ARCH" "$CACHE/rootfs-$ARCH"
echo "Download complete."
else
echo "Found."
fi
# make a local copy of the minidebian
echo -n "Copying rootfs ..."
cp -a $CACHE/rootfs-$ARCH $ROOTFS && echo "Done." || exit
) 200> "@LOCALSTATEDIR@/lock/subsys/lxc"
fi
cache=$1
arch=$2
rootfs=$3
# make a local copy of the minidebian
echo -n "Copying rootfs to $rootfs..."
cp -a $cache/rootfs-$arch $rootfs || return 1
return 0
}
create() {
collect_information
install_debian
write_lxc_mounts
write_lxc_configuration
write_debian_inittab
write_debian_hostname
write_debian_fstab
write_debian_network
write_debian_sshd_config
install_debian()
{
cache="@LOCALSTATEDIR@/cache/lxc/debian"
rootfs=$1
mkdir -p @LOCALSTATEDIR@/lock/subsys/
(
flock -n -x 200
if [ $? -ne 0 ]; then
echo "Cache repository is busy."
return 1
fi
write_debian_selinux
arch=$(arch)
if [ "$arch" == "x86_64" ]; then
arch=amd64
fi
reconfigure_debian_packages
if [ "$arch" == "i686" ]; then
arch=i386
fi
disable_debian_services
echo "Checking cache download in $cache/rootfs-$arch ... "
if [ ! -e "$cache/rootfs-$arch" ]; then
download_debian $cache $arch
if [ $? -ne 0 ]; then
echo "Failed to download 'debian base'"
return 1
fi
fi
@BINDIR@/lxc-create -n $NAME -f $CONFFILE
RES=$?
copy_debian $cache $arch $rootfs
if [ $? -ne 0 ]; then
echo "Failed to copy rootfs"
return 1
fi
# remove the configuration files
rm -f $CONFFILE
rm -f $TMPMNTFILE
return 0
if [ "$RES" != "0" ]; then
echo "Failed to create '$NAME'"
exit 1
fi
) 200>@LOCALSTATEDIR@/lock/subsys/lxc
echo "Done."
echo -e "\nYou can run your container with the 'lxc-start -n $NAME'\n"
return $?
}
destroy() {
echo -n "What is the name for the container ? [$NAME] "
read _NAME_
if [ ! -z "$_NAME_" ]; then
NAME=$_NAME_
fi
@BINDIR@/lxc-destroy -n $NAME
RETVAL=$?
if [ ! $RETVAL -eq 0 ]; then
echo "Failed to destroyed '$NAME'"
return $RETVAL;
fi
copy_configuration()
{
path=$1
rootfs=$2
name=$3
ROOTFS="./rootfs.$NAME"
cat <<EOF >> $path/config
lxc.tty = 4
lxc.pts = 1024
lxc.rootfs = $rootfs
lxc.cgroup.devices.deny = a
# /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
# consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/{,u}random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
# rtc
lxc.cgroup.devices.allow = c 254:0 rwm
EOF
echo -n "Shall I remove the rootfs [y/n] ? "
read
if [ "$REPLY" = "y" ]; then
rm -rf $ROOTFS
if [ $? -ne 0 ]; then
echo "Failed to add configuration"
return 1
fi
return 0
}
help() {
cat <<EOF
This script is a helper to create debian system containers.
The script will create the container configuration file following
the informations submitted interactively with 'lxc-debian create'
The first creation will download, with debootstrap, a debian
minimal and store it into a cache.
The script will copy from the cache the root filesystem to the
current directory.
If there is a problem with the container, (bad configuration for
example), you can destroy the container with 'lxc-debian destroy'
but without removing the rootfs and recreate it again with
'lxc-debian create'.
If you want to create another debian container, call the 'lxc-debian
create' again, specifying another name and new parameters.
At any time you can purge the debian cache download by calling
'lxc-debian purge'
Have fun :)
EOF
}
purge() {
clean()
{
cache="@LOCALSTATEDIR@/cache/lxc/debian"
if [ ! -e $CACHE ]; then
if [ ! -e $cache ]; then
exit 0
fi
# lock, so we won't purge while someone is creating a repository
(
flock -n -x 200
RES=$?
if [ "$RES" != "0" ]; then
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
rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1
exit 0
) 200> "@LOCALSTATEDIR@/lock/subsys/lxc"
) 200>@LOCALSTATEDIR@/lock/subsys/lxc
}
if [ "$(id -u)" != "0" ]; then
echo "This script should be run as 'root'"
usage()
{
cat <<EOF
$1 -h|--help -p|--path=<path> --clean
EOF
return 0
}
options=$(getopt -o hp:n:c -l help,path:,name:,clean -- "$@")
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;;
-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
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
case "$1" in
create)
create;;
destroy)
destroy;;
help)
help;;
purge)
purge;;
*)
echo "Usage: $0 {create|destroy|purge|help}"
exit 1;;
esac
rootfs=$path/rootfs
install_debian $rootfs
if [ $? -ne 0 ]; then
echo "failed to install debian"
exit 1
fi
configure_debian $rootfs $name
if [ $? -ne 0 ]; then
echo "failed to configure debian for a container"
exit 1
fi
copy_configuration $path $rootfs
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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