I have to solve the PostgreSQL HA and Redundancy few weeks ago. It has been written a lot about this topic, but I was not able to find some guide describing pgpool-II and repmgr. After reading some documents I build the solution which I'm going to describe.
In short it contains the Master/Slave DB Streaming replication and pgpool load distribution and HA. The replication "part" is managed by repmgr.
Here is the network diagram:
