PostgreSQL HA is not that difficult to setup, repmgr makes the task pretty easy. If you are talking about automatic failover then that's another story entirely,

PostgreSQL HA is not that difficult to setup, repmgr makes the task pretty easy. If you are talking about automatic failover then that's another story entirely, because it is simply not appropriate for relational databases unless you are using shared storage (expensive, painful) - but if you want to go that route corosync and pacemaker have your back.