As your applications scale, you’ll likely find that your database is one of the major bottlenecks. There are a variety of options available for scaling a database server; one is master-slave replication, and another (but often trickier) is master-master replication. MariaDB, an open-source fork of MySQL, supports an add-on package known as MariaDB Galera Cluster, which offers a variety of replication options, including multi-master replication. How does it work? How do you configure it? And does this option apply to your needs? This talk, by Nirbhay Choubey, should provide you with most of the answers that you need.