--- node server.js or node server --> start node server.js

--- ./mongo todos --> apre il db mongo "todos" (in mongodb/bin)

--- ./mongod --storageEngine=mmapv1 --dbpath /data/db --> start listener for mongodb connection (in mongodb/bin)

--- https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-14-04 --> config nginx to work with node server

--- http://www.axllent.org/docs/view/nodejs-service-with-systemd/ --> config ubuntu to startup node at boot