How to install Hackpad on a CentOS 7 VPS

In this tutorial, we will explain how to install Hackpad on a Centos 7 VPS with nginx as a reverse proxy. Hackpad is a web-based real-time wiki, based on the open source EtherPad collaborative editor. This guide should work on other Linux VPS systems as well but was tested and written for a Centos 7 VPS.