第一步，创建开启脚本 apprun ，目录：touch /etc/init.d/apprun

#!/bin/sh
#
# start/stop app daemon.

### BEGIN INIT INFO
# Provides:          app
# Required-Start:    $network
# Required-Stop:     $network
# Default-Start:     S 2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: app daemon
# Description:       app is a daemon used to enable NFC features
### END INIT INFO

chmod 755 /home/root/ftp/app

#设置app 所在目录
DAEMON=/home/root/ftp/app   
PIDFILE=/var/run/app.pid
DESC="Linux app daemon for firets"

if [ -f /etc/default/app ] ; then
        . /etc/default/app
fi

set -e

do_start() {
       $DAEMON > /tmp/app.log 2>&1 &
}

do_stop() {
        start-stop-daemon --stop --name app --quiet
}

case "$1" in
  start)
        echo "Starting $DESC"
        do_start
        ;;
  stop)
        echo "Stopping $DESC"
        do_stop
        ;;
  restart|force-reload)
        echo "Restarting $DESC"
        do_stop
        sleep 1
        do_start
        ;;
  *)
        echo "Usage: $0 {start|stop|restart|force-reload}" >&2
        exit 1
        ;;
esac

exit 0

第二步：查看当前运行级别：sudo runlevel ,比如 N 5 就是5级别。 建立软链接：

ln -s /etc/init.d/apprun /etc/rc5.d/S50appgo