How to Install OwnCloud 8 with Nginx and MariaDB on CentOS 7

OwnCloud is a server software for data synchronization and file-sharing with an easy to use web-based frontend that is available under a open source license. Owncloud can be installed on a Linux or Windows webserver, is easy to configure and has a comprehensive online documentation. The native client is available for Windows, MacOS and Linux (Desktop Application). There is also a mobile app for Android and iOS.