Presented at PG West 2010 in San Francisco. Demo of Slony-I, a master-to-multiple-slaves replication engine for Postgres. It replicates DML and DDL changes from one machine to any number of machines in your database cluster. Slony also supports cascading replication architectures, meaning that you can basically have a slave that replicates data changes to another slave. Note that this is NOT master-master replication. It's more like parent-child-grandchild replication. Finally, Slony provides a couple of features that make failover and High Availability possible for the database cluster.