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How to install GlusterFS with a replicated high availability storage volume on Ubuntu Linux 16.04 LTS

I want to share my web server DocumentRoot /var/www/html/ across 2 Apache web server. Both of my web servers are behind load balanced reverse proxy powered by Nginx. How do I setup and install GlusterFS (distributed storage) which is a scalable network filesystem on Ubuntu Linux 16.04 LTS server? This tutorial shows you how to install GlusterFS on Ubuntu Linux 16.04 LTS server and configure 2 nodes high availability storage for your web server.