> Is there any tutorials or detailed instructions on how to set up HA 
> postgresql & failover? The documentation 
> (http://www.postgresql.org/docs/9.0/interactive/warm-standby-failover.html) 
> on this topics is pretty scarce.
> 
> The scenario I'm most interested in is this:
> 
> 2 servers - a master and a hot standby. All writes are sent to master, reads 
> are split between master and hot standby.
> 
> 1) If the hot standby goes down, how do I redirect reads to the master?

pgpool-II 3.0 will take care of this.

> 2) If the master fails
>     -how do I automatically promote the standby to master and send all 
> reads/writes to the new master?

This is covered by pgpool-II 3.0 as well.

>     -what happens when the old master comes back up? Do I need to so anything 
> to make it catches up to the new master?

I recommend to use it a standby. Such a configuration is possible by
using pgpool-II 3.0.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

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