How to install and configure Galera MySQL Ccluster on CentOS 7

This video covers the installation of MariaDB Galera. MariaDB Galera Cluster is a synchronous multi-master cluster for MariaDB. It is available on Linux only, and only supports the XtraDB/InnoDB storage engines.
For more explanation on this video: https://www.linuxhelp.com/how-to-install-and-configure-galera-mysql-cluster-on-centos-7/

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centos 7