nginx startup for ubuntu

#!/bin/sh
### BEGIN INIT INFO
# Provides:          nginx
# Required-Start:    $network $remote_fs $local_fs
# Required-Stop:     $network $remote_fs $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Stop/start nginx
### END INIT INFO

DESTINATION_DIR='/opt'
INSTALL_DIR='/opt/nginx/'
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC=nginx
NAME=nginx
CONFIG_FILE=/etc/nginx/nginx.conf
DAEMON="${INSTALL_DIR}/sbin/${NAME}"
DAEMON_OPTS="-c $CONFIG_FILE"
PIDFILE=/var/run/${NAME}.pid
SCRIPTNAME=/etc/init.d/${NAME}

[ -x $DAEMON ] || exit 0

[ -r /etc/default/$NAME ] && . /etc/default/$NAME

. /lib/init/vars.sh

. /lib/lsb/init-functions


do_start()
{
  # Check if the ULIMIT is set in /etc/default/nginx
  if [ -n "$ULIMIT" ]; then
    # Set the ulimits
    ulimit $ULIMIT
  fi
  start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
    $DAEMON_OPTS \
    || return 2
}

do_stop()
{
  # Return
  #   0 if daemon has been stopped
  #   1 if daemon was already stopped
  #   2 if daemon could not be stopped
  #   other if a failure occurred
  start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
  RETVAL="$?"
  rm -f $PIDFILE
  return "$RETVAL"
}

do_reload() {
  #
  start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
  return 0
}

case "$1" in
  start)
    log_daemon_msg "Starting $DESC " "$NAME"
    do_start
    case "$?" in
    0|1) log_end_msg 0 ;;
    2) log_end_msg 1 ;;
  esac
  ;;
  stop)
  log_daemon_msg "Stopping $DESC" "$NAME"
  do_stop
  case "$?" in
    0|1) log_end_msg 0 ;;
    2) log_end_msg 1 ;;
  esac
  ;;
  status)
       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  reload|force-reload)
  log_daemon_msg "Reloading $DESC" "$NAME"
  do_reload
  log_end_msg $?
  ;;
  restart|force-reload)
  log_daemon_msg "Restarting $DESC" "$NAME"
  do_stop
  case "$?" in
    0|1)
    do_start
    case "$?" in
      0) log_end_msg 0 ;;
      1) log_end_msg 1 ;; # Old process is still running
      *) log_end_msg 1 ;; # Failed to start
    esac
    ;;
    *)
      # Failed to stop
    log_end_msg 1
    ;;
  esac
  ;;
  *)
  echo "Usage: $SCRIPTNAME {start|stop|status|restart|reload|force-reload}" >&2
  exit 3
  ;;
esac

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