Slony-I is a "master to multiple slaves" replication system for PostgreSQL supporting cascading (e.g. - a node can feed another node which feeds another node...) and failover.

Slony-I was popular in PostgreSQL 7.x to 11 but has not received updates in many years. We recommend that you look into the Logical Replication features built into modern versions of PostgreSQL.

Slony-I was primarily developed and maintained by Jan Wieck, Christopher Browne and Steve Singer but had contributions from many contributors. Much of the developed was sponsored by Afilias