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Re: Failover Master setup

Simply moving an virtual IP is insufficient.  An app that needs to talk
to the master will also likely want to make queries against it.  So, in
a failover setup, the secondary master has to stay in sync with the
master.  In other words, slurpd has to be replicating to it at all times
and the secondary should not be replicating to anyone else (it should
act as a slave).  When the primary goes down, the secondary has to
realize it is now in charge or replicating to the slaves.

-- DK

On Fri, 2005-06-24 at 10:23, matthew sporleder wrote:
> Use Veritas to float an IP and mount.
> It will just move the whole app to a different server on failure.
> If you want protection against data-inconsistancy/corruption on an
> active-active multi-master setup, then I would be interested to see
> how other LDAP's implement ACID-ity.  :)
> On 6/23/05, Digant C Kasundra <digant@uta.edu> wrote:
> > Hello everyone,
> > 
> > A month or two down the line, we are hoping to have our PeopleSoft
> > Student Information System write directly to our LDAP directory.  As
> > such, the question of "why are we using OpenLDAP if it can't do
> > multi-master" is cropping up from my superiors.  As OpenLDAP does not
> > support multi-master (for good reason, I think), I was wanting to try to
> > figure out a way to setup a failover master and was wondering if anyone
> > has done work in this area?
> > 
> > As it would work in my head, M1 would replicate to M2 and all the
> > slaves.  A heartbeat on M2 would monitory to make sure M1 was active.
> > If M1 goes down, M2 would rewrite its config to replicate to M1 and the
> > slaves and would take over as the master server.
> > 
> > Anyone given thought to this sort of setup?  I've never had my master
> > server fail but I need to appease the naysayers. :)
> > 
> > -- DK
Digant C Kasundra
Enterprise Operations and Systems
Office of Information Technology
University of Texas at Arlington
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