MaxScale is a database proxy that provides high availability and scalability for MariaDB servers. It can be used to configure load balancing of read/write connections, auto failover/switchover/rejoin using MariaDB GTID replication. Keepalived can be used with MaxScale to provide high availability by monitoring MaxScale and failing over if needed. The document provides details on setting up MariaDB replication with GTID, installing and configuring MaxScale and Keepalived. It also describes testing the auto failover functionality.