Galera Cluster, or simply Galera, is a cluster implementation for MariaDB and MySQL. The project site is http://galeracluster.com/. MariaDB Galera Cluster is an official MariaDB distribution that contains the Galera technology. It follows the same major version numbers as the underlying MariaDB version. The first version was 5.5. Another distribution, Percona XtraDB Cluster, is based on Percona Server.

MariaDB Galera Cluster can be installed and updated from the MariaDB official repositories, or the Linux generic binaries can be downloaded from the MariaDB site. Some documentation about MariaDB Galera Cluster is included in MariaDB Knowledge Base. When we are searching for information that is not documented in the knowledge base, we can search the documentation of Galera Cluster for MySQL: http://galeracluster.com/documentation-webpages/.

This section provides general information about the technology used by Galera.