OwnCloud is a server software for data synchronization and file sharing with an easy to use web frontend. OwnCloud can be installed on a Linux or Windows server, it 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. This tutorial describes the installation of Owncloud 9.1 on CentOS 7 with Nginx web server and MariaDB database.