setup.sh

#!/bin/sh -ex

if ! lsb_release --id --short | grep -qF 'Ubuntu'; then
    echo "Ubuntu only"
    exit 1
fi

if ! lsb_release --codename --short | grep -qF 'precise'; then
    echo "12.04 precise only"
    exit 1
fi

# system update
apt-get update -y
apt-get upgrade -y

# sysctl.conf
# todo: more tuning
cat << 'EOF' >> /etc/sysctl.conf
vm.swappiness = 0
vm.overcommit_memory = 2
vm.overcommit_ratio = 90
net.core.somaxconn = 1024
EOF

# apt-get install
apt-get install -y smartmontools

# zfs
apt-get install -y python-software-properties
apt-add-repository -y ppa:zfs-native/stable
apt-get install -y debootstrap ubuntu-zfs


for dev in $(ls "/sys/block" | grep -iE '^sd[a-z]$'); do
    if [ "$(cat /sys/block/${dev}/removable)" -ne 1 -a "$(cat /sys/block/${dev}/size)" -ne 0 ]; then
        INST_DEV="/dev/${dev}5"
        break
    fi
done
[ -b "$INST_DEV" ] && zpool create -f -m none tank "$INST_DEV"
zfs create -o atime=off -o compression=lzjb -o mountpoint=/backup -o snapdir=visible tank/backup