I've read many answers to your comment saying "but it's not that hard". So to all those people : please, write a blog or send a link to one that explains how to

I've read many answers to your comment saying "but it's not that hard". So to all those people : please, write a blog or send a link to one that explains how to setup a HA cluster with automatic failover. I've spent some time trying to setup a simple pg cluster once ( not even HA, just duplicate writes) and it was nothing but straightforward.