Users will access this server’s public IP address to get to your Node.js application.
web: The server where we will install the Nginx web server, which will act as a reverse proxy to your application. app: The server where we will install Node.js runtime, your Node.js application, and PM2. We will refer to them by the following names: Private networking can be configured on new servers when they are being created (in the Select additional options section). This guide uses two CentOS 7 servers with private networking (in the same datacenter). The Ubuntu version of this tutorial can be found here. In this tutorial, we will cover setting up a production-ready Node.js environment that is composed of two CentOS 7 servers one server will run Node.js applications managed by PM2, while the other will provide users with access to the application through an Nginx reverse proxy to the application server. Node.js applications can be run at the command line but we will teach you how to run them as a service, so they will automatically restart on reboot or failure, so you can use them in a production environment. The platform runs on Linux, OS X, FreeBSD, and Windows, and its applications are written in JavaScript. 
Node.js is an open source Javascript runtime environment for easily building server-side and networking applications.
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