Amazon AWS Node.js WebSocket

You CAN use Elastic Beanstalk with the free usage tier. However if you want to run both Postgres and Node.js, you might find you need to roll your own EC2 instance to remain within the free usage constraints - check here: http://aws.amazon.com/free/

EB does make it relatively simple to deploy, and if you do your development setup correctly, EB will install the extra node modules you need.

In any case, when developing you will find you need to install new modules - I'm sure you're familiar with the npm install mechanism. What you need to add to that is the --save option, so

npm install pg

becomes

npm install --save pg

This then adds that package to the dependencies section of the package.json file. When you deploy to EB or any other dev ops system, these dependencies are automatically installed (the system runs npm install). If you are cloning from a repository onto your server, then running npm install yourself will install those modules.

Hopefully this helps you get the modules you need installed on the server. It's worth noting that your node_modules directory should not be shipped with your code - let the system build it when deploying.