KeystoneJS apps will default to using port 3000, but they will respect the PORT environmental variable. So in order to run it on port 80, you could start it like:

PORT=80 node keystone

See the web server options in the KeystoneJS configuration docs.

In a more robust production setup, you might want to use an Nginx reverse proxy instead of serving it on port 80 directly. Check out this tutorial for more information:

• How To Set Up a Node.js Application for Production on Ubuntu 14.04