How to run application on startup in ubuntu

1. Step first create xyz.conf file into /etc/init/ and put your script.

example : let me start node server on start up

description "test job"

start on runlevel [2345]

exec node /path/of/your/file/script.js

2. Save this file.

3. now type command sudo service xyz start. Node server will start.

You can stop it with stop command and restart with restart command.