[Dovecot] dovecot director service

Oliver Eales jester at arcor.de
Thu Jul 8 11:00:48 EEST 2010

Am 08.07.2010 09:31, schrieb Xavier Pons:
>  El 07/07/2010 13:35, Timo Sirainen escribió:
> ....
>>> this limitation does not allow use the same two directors servers 
>>> like mail backend servers?
>> You can install two Dovecot instances on the same server (set 
>> different base_dir for them), one as director and another as mail 
>> server. A bit annoying to have two of them, but it should work.
> I suppouse, this require to have different IPs address for every 
> instance?
>>> the fairlure of one director server it's automatically detected or 
>>> require manual intervention?
>>> It's automatically detected. I've only simulated it with software, 
>>> but you could also try it by actually pulling the network plug out. :)
> If I have different dovecot instances on same host, one like proxy and 
> another like mail backend, the director service will detect both 
> failures of
> director service like of backend servers? or only detect the first one?

You will have to build some kind of HA environment in front of the 
proxys. If you just use DNS round-robin for connects to the proxy server 
(the instance) client connection attempts to this particular server will 
fail. The director service is only for user-stickyness (and HA) between 
the 1st and the 2nd tier. Most common use would be in a NFS storage backend.


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