ntp_setup.sh

#!/bin/bash

modconf() {
    conf=$1; before=$2; after=$3

    mode=`stat -c "%a" $conf`
    tmpfile=`mktemp /tmp/__modconf.XXXXXX`
    cat $conf | sudo sed -r "s/$before/$after/" >$tmpfile
    mv $tmpfile $conf
    chmod $mode $conf
    rm -f $tmpfile
}

auto_apt_get() {
    DEBIAN_FRONTEND=noninteractive apt-get -y --force-yes $*
}

auto_apt_get install ntp

modconf /etc/ntp.conf "server 0.ubuntu.pool.ntp.org" "server ntp.nict.jp"
modconf /etc/ntp.conf "server 1.ubuntu.pool.ntp.org" "server ntp1.jst.mfeed.ad.jp"
modconf /etc/ntp.conf "server 2.ubuntu.pool.ntp.org" "server ntp2.jst.mfeed.ad.jp"
modconf /etc/ntp.conf "server 3.ubuntu.pool.ntp.org" "server ntp3.jst.mfeed.ad.jp"

service ntp restart