MariaDB Galera Cluster ready for production use
MariaDB now has a high-availability option ready for production use; the developers at MariaDB and Codership have released MariaDB Galera Cluster 5.5.29 as a Stable GA (generally available) version. The release gives MariaDB users access to a scaling solution for the SQL database with synchronous multi-master replication and guaranteed data consistency. Clusters built with the technology should prove automatically resilient with no risk of losing nodes with unique datasets on them.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump