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How to Install Dolibarr ERP CRM on a CentOS 7 VPS

his step by step tutorial will show you how to install Dolibarr ERP CRM on a CentOS 7 VPS with Apache, PHP and PostgreSQL installed on it. Dolibarr is an open source web based ERP and CRM software that can be used to manage your business operations.
This tutorial was tested and written for a CentOS 7 VPS, but it should work on any RPM based Linux distribution.

At the time of writing this tutorial, the latest stable version of Dolibarr ERP CRM is 3.5.2 and it requires:

PHP 5.3 or higher with enabled user sessions.
Apache Web Server = 2.0 compiled with mod_rewrite module and with the following directives allowed: RewriteEngine, RewriteBase, RewriteCond and RewriteRule.;
PostgreSQL, MariaDB, or MySQL installed on your Linux VPS (do not use MySQL version 5.5.40 nor 5.5.51).