Christian Zoffoli via Postfix-users:
> I'm asking because I was using it with HAProxy, and with the load
> balancer between Postfix and the two Rspamd machines, I often have
> unexplainable timeouts. In general, I see that Postfix does not like
> interacting with load balancers; I've had similar issues with MySQL
> connections always balanced with HAProxy
By design Postfix DOES NOT immediately retry connecting to the
same host. In many contexts that would be considered rude.
That of course has consequences when a service "host" is in fact
a load balancer.
If you MUST use a load balancer for the MySQL service, specify the
"host" multiple times in the Postfix MySQL client configuration.
Or stop playing load balancer games and specify the real server
hosts in the Postfix MySQL client configuration. That is how it is
supposed to be used.
Wietse
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