/etc/init.d/ntpd 파일(NTP설정)

NTP란?

여러서버 노드(node)에서 하둡(Hadoop)을 설치할때 서버간에 확인해봐야 하는 것이 바로 시간동기화 이다. 그리고 시간 동기화를 위해서 사용하는 방법중 하나가 바로 NTP이다. 실제 NTP를 설치하고 설정하는 과정에서 /etc/init.d/에 위치한 ntpd파일이 없어 아래 내용이 필요했던 적이 있다. ntpd파일을 찾는 경우 아래 내용을 복사하여 ntpd파일을 만들면 된다.

/etc/init.d/ntpd 파일내용

#!/bin/bash
#
# ntpd          This shell script takes care of starting and stopping
#               ntpd (NTPv4 daemon).
#
# chkconfig: - 58 74
# description: ntpd is the NTPv4 daemon. \
# The Network Time Protocol (NTP) is used to synchronize the time of \
# a computer client or server to another server or reference time source, \
# such as a radio or satellite receiver or modem.

### BEGIN INIT INFO
# Provides: ntpd
# Required-Start: $network $local_fs $remote_fs
# Required-Stop: $network $local_fs $remote_fs
# Should-Start: $syslog $named ntpdate
# Should-Stop: $syslog $named
# Short-Description: start and stop ntpd
# Description: ntpd is the NTPv4 daemon. The Network Time Protocol (NTP)
#              is used to synchronize the time of a computer client or
#              server to another server or reference time source, such
#              as a radio or satellite receiver or modem.
### END INIT INFO

# Source function library.
. /etc/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

prog=ntpd
lockfile=/var/lock/subsys/$prog

start() {
        [ "$EUID" != "0" ] && exit 4
        [ "$NETWORKING" = "no" ] && exit 1
        [ -x /usr/sbin/ntpd ] || exit 5
        [ -f /etc/sysconfig/ntpd ] || exit 6
        . /etc/sysconfig/ntpd

        # Start daemons.
        echo -n $"Starting $prog: "
        daemon $prog $OPTIONS
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ] && touch $lockfile
        return $RETVAL
}

stop() {
        [ "$EUID" != "0" ] && exit 4
        echo -n $"Shutting down $prog: "
        killproc $prog
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ] && rm -f $lockfile
        return $RETVAL
}

# See how we were called.
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  status)
        status $prog
        ;;
  restart|force-reload)
        stop
        start
        ;;
  try-restart|condrestart)
        if status $prog > /dev/null; then
            stop
            start
        fi
        ;;
  reload)
        exit 3
        ;;
  *)
        echo $"Usage: $0 {start|stop|status|restart|try-restart|force-reload}"
        exit 2
esac