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#!/bin/bash
echo "Creating Scientific Linux 6 node..."
configure_scientific()
{
rootfs=$1
hostname=$2
# disable selinux in scientific
mkdir -p $rootfs/selinux
echo 0 > $rootfs/selinux/enforce
# add host root ssh access
mkdir $rootfs/root/.ssh
chmod 0600 $rootfs/root/.ssh
cat <<-EOF > $rootfs/root/.ssh/authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDCguB7XL3ARzLZYLsIMZe4UUO371m+H5C6V8MhtmSlgXtgHDo7eZhNSm5zCeoyGd32OKeLxuxCCEkXfDDF1aa2a6twcASE3pmWNdnBS7auiOH4P7g+eQ4Aw9v7DdESbIVgHF/NDiAEFFdmApYNM3oCX2FhEVNVKxkkIokUr4axYFJzmJ6Xoi5Sd8JtPC85FZVXqDucZDnHQlOcCkbSo0UOmsWQGwtu8eUHoDeUG0dB8ntb9xlBeLctdrAPhuFYCX8IfFkdcakkzv61ETPbKE6g9wdTDC/TEep7/AHGYmarziRnwKiVOL1jnE1coOJLqy8wOC3dKGmRZy9D4sTc+FRV root insecure public key
EOF
cp /usr/lib64/lxc/templates/files/rc.local $rootfs/etc/rc.local
# set the hostname
cat <<EOF > $rootfs/etc/hostname
$hostname
EOF
# set minimal hosts
cat <<EOF > $rootfs/etc/hosts
127.0.0.1 localhost $hostname
EOF
cat <<EOF > $rootfs/etc/init/console.conf
# console - mingetty
#
# 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/mingetty console
EOF
# cat <<EOF > $rootfs/etc/fstab
#none /dev/pts devpts defaults 0 0
#EOF
[ ! -f $rootfs/etc/init/kexec-disable.conf ] || mv $rootfs/etc/init/kexec-disable.conf $rootfs/etc/init/kexec-disable.conf.orig
sed -i -e 's:/sbin/start_udev:#/sbin/start_udev:' $rootfs/etc/rc.d/rc.sysinit
sed -i -e 's:\(Defaults *requiretty\):# \1:' $rootfs/etc/sudoers
# create necessary devices
rm $rootfs/dev/null
mknod -m 666 $rootfs/dev/null c 1 3
mknod -m 666 $rootfs/dev/random c 1 8
mknod -m 666 $rootfs/dev/urandom c 1 9
mkdir -m 755 $rootfs/dev/pts
mknod -m 666 $rootfs/dev/tty c 5 0
mknod -m 666 $rootfs/dev/tty0 c 4 0
mknod -m 666 $rootfs/dev/tty1 c 4 1
mknod -m 666 $rootfs/dev/tty2 c 4 2
mknod -m 666 $rootfs/dev/tty3 c 4 3
mknod -m 666 $rootfs/dev/tty4 c 4 4
mknod -m 600 $rootfs/dev/console c 5 1
mknod -m 666 $rootfs/dev/full c 1 7
mknod -m 600 $rootfs/dev/initctl p
# change root password
echo "Set root password to 'root'"
echo "root:root" | chroot $rootfs chpasswd
return 0
}
copy_scientific()
{
cache=$1
arch=$2
rootfs=$3
# make a local copy of the miniscientific
echo "Extracting rootfs image to $rootfs ..."
mkdir $rootfs
tar zxf $cache/scientific-6-$arch.tar.gz -C $rootfs || return 1
return 0
}
install_scientific()
{
cache="/var/cache/lxc"
rootfs=$1
mkdir -p /var/lock/subsys/
(
flock -n -x 200
if [ $? -ne 0 ]; then
echo "Cache repository is busy."
return 1
fi
arch=$(arch)
if [ "$arch" == "i686" ]; then
arch=i386
fi
echo "Checking image cache in $cache/rootfs-$arch ... "
if [ ! -e "$cache/rootfs-$arch" ]; then
if [ $? -ne 0 ]; then
echo "Failed to download 'scientific base'"
return 1
fi
fi
copy_scientific $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
cat <<EOF >> $path/config
lxc.utsname = $name
lxc.tty = 4
lxc.pts = 1024
lxc.rootfs = $rootfs
lxc.mount = $path/fstab
lxc.cgroup.devices.deny = a
lxc.cgroup.devices.allow = b 1:0 rwm
lxc.cgroup.devices.allow = b 1:1 rwm
lxc.cgroup.devices.allow = c 1:1 rwm
lxc.cgroup.devices.allow = c 1:2 rwm
lxc.cgroup.devices.allow = c 1:4 rwm
lxc.cgroup.devices.allow = c 1:6 rwm
lxc.cgroup.devices.allow = c 1:7 rwm
lxc.cgroup.devices.allow = c 1:11 rwm
lxc.cgroup.devices.allow = c 2:* rwm
lxc.cgroup.devices.allow = c 3:* rwm
# /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 <<EOF > $path/fstab
proc $rootfs/proc proc nodev,noexec,nosuid 0 0
devpts $rootfs/dev/pts devpts defaults 0 0
sysfs $rootfs/sys sysfs defaults 0 0
EOF
if [ $? -ne 0 ]; then
echo "Failed to add configuration"
return 1
fi
return 0
}
clean()
{
cache="/var/cache/lxc"
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..."
rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1
exit 0
) 200>/var/lock/subsys/lxc
}
usage()
{
cat <<EOF
$1 -h|--help -p|--path=<path> --clean
EOF
return 0
}
options=$(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 "$path" ]; then
clean || exit 1
exit 0
fi
if [ -z "$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_scientific $rootfs
if [ $? -ne 0 ]; then
echo "failed to install scientific"
exit 1
fi
configure_scientific $rootfs $name
if [ $? -ne 0 ]; then
echo "failed to configure scientific for a container"
exit 1
fi
copy_configuration $path $rootfs $name
if [ $? -ne 0 ]; then
echo "failed write configuration file"
exit 1
fi
if [ ! -z $clean ]; then
clean || exit 1
exit 0
fi