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List:       horde
Subject:    Re: [horde] ha concepts for horde database
From:       Ralf Lang <lang () b1-systems ! de>
Date:       2015-01-19 14:44:02
Message-ID: 54BD1832.3080402 () b1-systems ! de
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On 19.01.2015 14:59, Michael Menge wrote:
> 
> As automatic detection and handeling of a faild master is difficult
> (split brain without a quorum), reconfiguration of the database
> (changing slave to master) should be done manually.
> 
> I hoped that horde would switch to an readonly database mode if there
> is no connection to db-master. But Horde thows an exception
> "Could not instantiate PDO. PDOException"
> 
> Did I miss something in the configuration, or is my planned setup not
> possible? Would a read-only database failback mode be difficult to
> implement?
> 
> What other ha database setups are used?

Split Read is a performance measure. It requires both database
connections. It is not a HA measure.

You probably should just toggle the database dns name's IP during failover.

Implementing a list of DB hosts which cycles on failed connect should
not be too hard, but I think it's a very special requirement. The core
devs might not be interested.


-- 
Ralf Lang
Linux Consultant / Developer
Tel.: +49-170-6381563
Mail: lang@b1-systems.de
B1 Systems GmbH
Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537


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