As we stated previously, replication is great, provided that it works. It works well if it's understood, and it works even better if it's tested. This is a great reason to use the repmgr utility.
repmgr 4.0 is an open source tool that was designed specifically for PostgreSQL replication. To get additional information about repmgr, visit http://www.repmgr.org/.
The repmgr utility provides a command-line interface and a management process (daemon) that's used to monitor and manage PostgreSQL servers involved in replication. The repmgr utility easily supports more than two nodes, with automatic failover detection.
