Init.d and Start Script for Nodejs based service. It uses pid file and checks process if exists

initd_nodejs

#!/bin/sh
# init.d script with LSB support.
### BEGIN INIT INFO
# Provides:          NODEJS_APP_NAME
# Required-Start:    $network $local_fs $remote_fs $syslog 
# Required-Stop:     
# Should-Start:      $named
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6      
# Short-Description: 
# Description:       
### END INIT INFO
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

SERVICE_NAME="MY SERVICE NAME"
MAIN_FILE="PATH TO JS FILE"
PID_PATH_NAME="PATH TO PID FILE"



start_it() {
	export NODE_ENV=production
	echo "starting $SERVICE_NAME ..."
    if [ ! -f $PID_PATH_NAME ]; then
        nohup nodejs  $MAIN_FILE /tmp 2>> /dev/null >> /dev/null &
        echo $! > $PID_PATH_NAME
        echo "$SERVICE_NAME started ..."
    else
		PID=$(cat $PID_PATH_NAME);
		if ps -p $PID > /dev/null
		then
			echo "$SERVICE_NAME is already running ..."
		else
			nohup nodejs  $MAIN_FILE /tmp 2>> /dev/null >> /dev/null &
        	echo $! > $PID_PATH_NAME
        	echo "$SERVICE_NAME started ..."
		fi
    fi
}

stop_it() {
	if [ -f $PID_PATH_NAME ]; then
        PID=$(cat $PID_PATH_NAME);
        echo "$SERVICE_NAME stoping ..."
        kill $PID;
        echo "$SERVICE_NAME stopped ..."
        rm $PID_PATH_NAME
    else
        echo "$SERVICE_NAME is not running ..."
    fi
}


restart_it() {
	if [ -f $PID_PATH_NAME ]; then
        stop_it
		start_it
    else
        echo "$SERVICE_NAME is not running ..."
    fi
}


case "$1" in
  start)
	start_it
        ;;
  stop)
	stop_it
        ;;
  restart)
	restart_it
		;;

  *)
        N=/etc/init.d/$NAME
        echo "Usage: $N {start|stop|restart}" >&2
        exit 1
        ;;
esac

exit 0