#!/bin/bash # # template script for generating fedora container for LXC # # # lxc: linux Container library # Authors: # 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 #VAR Declarations arch=$(arch) cache_base=/var/cache/lxc/fedora/$arch default_path=/var/lib/lxc # is this fedora? [ -f /etc/fedora-release ] && is_fedora=true configure_fedora() { # disable selinux in fedora mkdir -p $rootfs_path/selinux echo 0 > $rootfs_path/selinux/enforce # configure the network using the dhcp cat < ${rootfs_path}/etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes HOSTNAME=${UTSNAME} NM_CONTROLLED=no TYPE=Ethernet MTU=${MTU} EOF # set the hostname cat < ${rootfs_path}/etc/sysconfig/network NETWORKING=yes HOSTNAME=${UTSNAME} EOF # set minimal hosts cat < $rootfs_path/etc/hosts 127.0.0.1 localhost $name EOF sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.sysinit sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.d/rc.sysinit chroot ${rootfs_path} chkconfig udev-post off chroot ${rootfs_path} chkconfig network on chroot ${rootfs_path} passwd dev_path="${rootfs_path}/dev" rm -rf $dev_path mkdir -p $dev_path mknod -m 666 ${dev_path}/null c 1 3 mknod -m 666 ${dev_path}/zero c 1 5 mknod -m 666 ${dev_path}/random c 1 8 mknod -m 666 ${dev_path}/urandom c 1 9 mkdir -m 755 ${dev_path}/pts mkdir -m 1777 ${dev_path}/shm mknod -m 666 ${dev_path}/tty c 5 0 mknod -m 666 ${dev_path}/tty0 c 4 0 mknod -m 666 ${dev_path}/tty1 c 4 1 mknod -m 666 ${dev_path}/tty2 c 4 2 mknod -m 666 ${dev_path}/tty3 c 4 3 mknod -m 666 ${dev_path}/tty4 c 4 4 mknod -m 600 ${dev_path}/console c 5 1 mknod -m 666 ${dev_path}/full c 1 7 mknod -m 600 ${dev_path}/initctl p mknod -m 666 ${dev_path}/ptmx c 5 2 # provide the lxc service # cat < $rootfs_path/etc/init/lxc.conf ## fake some events needed for correct startup other services # #description "Container Upstart" # #start on startup # #script # rm -rf /var/run/*.pid # rm -rf /var/run/network/* # /sbin/initctl emit stopped JOB=udevtrigger --no-wait # /sbin/initctl emit started JOB=udev --no-wait #end script #EOF # # cat < $rootfs_path/etc/init/console.conf ## console - getty ## ## This service maintains a console on tty1 from the point the system is ## started until it is shut down again. # #start on stopped rc RUNLEVEL=[2345] #stop on runlevel [!2345] # #respawn #exec /sbin/getty -8 38400 /dev/console #EOF # cat < $rootfs_path/lib/init/fstab ## /lib/init/fstab: lxc system fstab #none /spu spufs gid=spu,optional 0 0 #none /tmp none defaults 0 0 #none /var/lock tmpfs nodev,noexec,nosuid,showthrough 0 0 #none /lib/init/rw tmpfs mode=0755,nosuid,optional 0 0 #EOF # # # reconfigure some services # if [ -z "$LANG" ]; then # chroot $rootfs_path locale-gen en_US.UTF-8 # chroot $rootfs_path update-locale LANG=en_US.UTF-8 # else # chroot $rootfs_path locale-gen $LAng # chroot $rootfs_path update-locale LANG=$LANG # fi # # remove pointless services in a container # chroot $rootfs_path /usr/sbin/update-rc.d -f ondemand remove # # chroot $rootfs_path /bin/bash -c 'cd /etc/init; for f in $(ls u*.conf); do mv $f $f.orig; done' # chroot $rootfs_path /bin/bash -c 'cd /etc/init; for f in $(ls tty[2-9].conf); do mv $f $f.orig; done' # chroot $rootfs_path /bin/bash -c 'cd /etc/init; for f in $(ls plymouth*.conf); do mv $f $f.orig; done' # chroot $rootfs_path /bin/bash -c 'cd /etc/init; for f in $(ls hwclock*.conf); do mv $f $f.orig; done' # chroot $rootfs_path /bin/bash -c 'cd /etc/init; for f in $(ls module*.conf); do mv $f $f.orig; done' echo "Please change root-password !" echo "root:root" | chroot $rootfs_path chpasswd return 0 } download_fedora() { # check the mini fedora was not already downloaded INSTALL_ROOT=$cache/partial mkdir -p $INSTALL_ROOT if [ $? -ne 0 ]; then echo "Failed to create '$INSTALL_ROOT' directory" return 1 fi # download a mini fedora into a cache echo "Downloading fedora minimal ..." YUM="yum --installroot $INSTALL_ROOT -y" PKG_LIST="yum initscripts passwd rsyslog vim-minimal dhclient chkconfig rootfiles policycoreutils" RELEASE_URL="http://ftp.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/releases/$release/Everything/x86_64/os/Packages/fedora-release-$release-1.noarch.rpm" curl $RELEASE_URL > $INSTALL_ROOT/fedora-release-$release.noarch.rpm mkdir -p $INSTALL_ROOT/var/lib/rpm rpm --root $INSTALL_ROOT --initdb rpm --root $INSTALL_ROOT -ivh $INSTALL_ROOT/fedora-release-$release.noarch.rpm $YUM install $PKG_LIST if [ $? -ne 0 ]; then echo "Failed to download the rootfs, aborting." return 1 fi mv "$INSTALL_ROOT" "$cache/rootfs" echo "Download complete." return 0 } copy_fedora() { # make a local copy of the minifedora echo -n "Copying rootfs to $rootfs_path ..." #cp -a $cache/rootfs-$arch $rootfs_path || return 1 # i prefer rsync (no reason really) mkdir -p $rootfs_path rsync -a $cache/rootfs/ $rootfs_path/ return 0 } update_fedora() { chroot $cache/rootfs yum -y update } install_fedora() { mkdir -p /var/lock/subsys/ ( flock -n -x 200 if [ $? -ne 0 ]; then echo "Cache repository is busy." return 1 fi echo "Checking cache download in $cache/rootfs ... " if [ ! -e "$cache/rootfs" ]; then download_fedora if [ $? -ne 0 ]; then echo "Failed to download 'fedora base'" return 1 fi else echo "Cache found. Updating..." update_fedora if [ $? -ne 0 ]; then echo "Failed to update 'fedora base', continuing with last known good cache" else echo "Update finished" fi fi echo "Copy $cache/rootfs to $rootfs_path ... " copy_fedora if [ $? -ne 0 ]; then echo "Failed to copy rootfs" return 1 fi return 0 ) 200>/var/lock/subsys/lxc return $? } copy_configuration() { cat <> $config_path/config lxc.utsname = $name lxc.tty = 4 lxc.pts = 1024 lxc.rootfs = $rootfs_path lxc.mount = $config_path/fstab lxc.console = /dev/console 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 cat < $config_path/fstab proc $rootfs_path/proc proc nodev,noexec,nosuid 0 0 devpts $rootfs_path/dev/pts devpts defaults 0 0 sysfs $rootfs_path/sys sysfs defaults 0 0 EOF if [ $? -ne 0 ]; then echo "Failed to add configuration" return 1 fi return 0 } clean() { if [ ! -e $cache ]; then exit 0 fi # lock, so we won't purge while someone is creating a repository ( flock -n -x 200 if [ $? != 0 ]; then echo "Cache repository is busy." exit 1 fi echo -n "Purging the download cache for Fedora-$release..." rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1 exit 0 ) 200>/var/lock/subsys/lxc } usage() { cat < [-p|--path=] [-c|--clean] [-R|--release=] [-A|--arch=] [-h|--help] Mandatory args: -n,--name container name, used to as an identifier for that container from now on Optional args: -p,--path path to where the container rootfs will be created, defaults to /var/lib/lxc. The container config will go under /var/lib/lxc in and case -c,--clean clean the cache -R,--release Fedora release for the new container. if the host is Fedora, then it will defaultto the host's release. -A,--arch NOT USED YET. Define what arch the container will be [i686,x86_64] -h,--help print this help EOF return 0 } options=$(getopt -o hp:n:cR -l help,path:,name:,clean,release -- "$@") 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;; -R|--release) release=$2; shift 2;; --) shift 1; break ;; *) break ;; esac done if [ ! -z "$clean" -a -z "$path" ]; then clean || exit 1 exit 0 fi #type febootstrap type yum if [ $? -ne 0 ]; then echo "'yum' command is missing" exit 1 fi if [ -z "$path" ]; then path=$default_path fi if [ -z "$release" ]; then if [ "$is_fedora" ]; then release=$(cat /etc/fedora-release |awk '/^Fedora/ {print $3}') else echo "This is not a fedora host and release missing, use -R|--release to specify release" exit 1 fi fi if [ "$(id -u)" != "0" ]; then echo "This script should be run as 'root'" exit 1 fi rootfs_path=$path/$name/rootfs config_path=$default_path/$name cache=$cache_base/$release install_fedora if [ $? -ne 0 ]; then echo "failed to install fedora" exit 1 fi configure_fedora if [ $? -ne 0 ]; then echo "failed to configure fedora for a container" exit 1 fi copy_configuration if [ $? -ne 0 ]; then echo "failed write configuration file" exit 1 fi if [ ! -z $clean ]; then clean || exit 1 exit 0 fi