> I'm not sure if this has been discussed before, because searching for
> things like "server" is not exactly a narrow search.
> 
> Anyhow, I have two systems on which I run PolicyD.
> 
> On the first, it was a simple setup:
> 
> Postfix
> Policyd
> MySql
> --- all on one box (along with MailScanner too but that's not
relevant) 
> 
> Adding the second box, I read that I should simply change the policyd

...

> Now, if #1 goes down, #2 can still send mail (the fail-safe mode). If
> #2 goes down, #1 doesn't care since he already has everything he
> needs to be able to send mail. 
> 
> Has anyone else used such a configuration? Is there an even better
> configuration than what I'm doing?

What we have is 2 identical servers running Postfix, MySQL and Policyd.
Each server uses it's local MySQL and Policyd.
We turned on MySQL Dual Master Replication (please read up on the
subject if you're going to do things like that) for the Policyd database
so that both servers share the same Policyd information. If one server
goes down, the other can take over instantly with the same information.
Both servers are in use so if a server would go down, one server would
get the load of the other too, but we have sufficient hardware specs to
take that hit.
There is a catch when one server really does go down: MySQL replication
doesn't work anymore. You'll have to get the databases in sync again and
that can be a pain if you don't know how.

I have not yet experienced any problems using this setup. If anyone
does, please let me (us) know.


--
Rob

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