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List:       postfix-users
Subject:    Postfix and HAProxy together on back-end node
From:       tom () iredmail ! org
Date:       2016-08-27 17:58:41
Message-ID: de9ba11ae8991b020ea39c0b95d49547 () iredmail ! org
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Hello!
We are setting different ways of implementation of high availability and 
have some questions about handling postfix. Currently our cluster has 3 
backend nodes with postfix and other email services. There is private 
floating IP between HAProxys on front-end nodes that handles application 
traffic (applications are on backend servers). On front-end servers 
there is also public floating IP that handles client traffic.
Would it be better to set-up HAProxy on every backend node and bind it 
to default mail services. We would move postfix ports e.g. 25, 587 - +1 
and bind default ports to HAProxy. By default we would redirect traffic 
to localhost, but in case of failure, to 2 other backend nodes.
In some environments there is no way to get private floating IP and this 
implementation would solve this. In the tests it behaved OK. Is this 
implementation stable for the future or did you guys encounter some 
problems, if anybody uses something similar?
I kindly ask if somebody can give us some more information regarding 
this 2 implementations and pros and cons of both or are there any other 
better ways of implementing this?

Thank you very much,
Tom
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