unstart config (/etc/init/) for run node.js app as the service

nodeapp.conf

description "node.js server"
author      "Yuaheni Pakala"

# used to be: start on startup
# until we found some mounts weren't ready yet while booting:
start on started mountall
stop on shutdown

# Automatically Respawn:
respawn
respawn limit 99 5

script
    # Not sure why $HOME is needed, but we found that it is:
    export HOME="/root"

    chdir /path/to/your/node-app

    exec nodejs server.js >> /var/log/my-app.log 2>&1
end script

post-start script
   # Optionally put a script here that will notifiy you node has (re)started
   # /root/bin/hoptoad.sh "node.js has started!"
end script

using

sudo service nodeapp start/stop/restart